{"id":1486,"date":"2026-03-04T10:20:17","date_gmt":"2026-03-04T02:20:17","guid":{"rendered":"https:\/\/jeez-semicon.com\/?p=1486"},"modified":"2026-03-04T11:35:44","modified_gmt":"2026-03-04T03:35:44","slug":"copper-cmp-slurry-dual-damascene-process-formulation-defect-control-complete-engineering-guide","status":"publish","type":"post","link":"https:\/\/jeez-semicon.com\/ru\/blog\/copper-cmp-slurry-dual-damascene-process-formulation-defect-control-complete-engineering-guide\/","title":{"rendered":"Copper CMP Slurry: Dual Damascene Process, Formulation &amp; Defect Control \u2014 Complete Engineering Guide"},"content":{"rendered":"<!--\n  CLUSTER ARTICLE 6 \u2014 COPPER CMP SLURRY\n  Slug: \/copper-cmp-slurry\/ | Focus KW: copper CMP slurry | ~2,900 words\n  Title: Copper CMP Slurry: Process, Formulation & Defect Control Guide (2025)\n  Meta: Complete guide to copper CMP slurry \u2014 dual damascene sequence, bulk Cu\n        and barrier step formulation, dishing\/erosion control, BTA 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a:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(0,0,0,.2)}\n\n\/* FAQ *\/\n.cmp-faq{margin:24px 0}\n.faq-item{border:1px solid #e2e8f0;border-radius:8px;margin-bottom:14px;overflow:hidden}\n.faq-question{background:#f8faff;padding:18px 22px;font-family:'Segoe UI',Arial,sans-serif;font-weight:700;color:#0a2463;font-size:15.5px;margin:0}\n.faq-answer{padding:18px 22px;background:#fff;font-size:15.5px;color:#2d2d2d;border-top:1px solid #e2e8f0}\n\n\/* Back to Pillar *\/\n.back-to-pillar{display:flex;align-items:center;gap:12px;background:#f0f4ff;border:1px solid #c7d5f5;border-radius:10px;padding:18px 24px;margin:48px 0 0;text-decoration:none!important;transition:background .2s}\n.back-to-pillar:hover{background:#e0e8ff}\n.back-to-pillar .btp-icon{font-size:24px;flex-shrink:0}\n.back-to-pillar .btp-text{font-family:'Segoe UI',Arial,sans-serif}\n.back-to-pillar .btp-label{font-size:12px;color:#64748b;display:block}\n.back-to-pillar .btp-title{font-size:15px;font-weight:700;color:#0a2463}\n\n@media(max-width:600px){\n  .cmp-hero{padding:32px 22px}\n  .cmp-cta{padding:28px 20px}\n  .cmp-toc{padding:22px 18px}\n  .process-flow{gap:4px}\n  .pf-step{min-width:110px;padding:14px 12px}\n  .dd-row{flex-direction:column}\n  .step-card{padding:20px 18px}\n}\n<\/style>\n\n<article class=\"cmp-article\" itemscope itemtype=\"https:\/\/schema.org\/Article\">\n\n\n<div class=\"cmp-hero\">\n  <p class=\"hero-intro\">Copper CMP is the most chemically complex and process-sensitive step in BEOL semiconductor manufacturing. A three-stage polishing sequence &#8212; each requiring a fundamentally different slurry chemistry &#8212; must deliver bulk copper removal, barrier\/liner planarization, and final buff polish while holding dishing below 20 nm and erosion below 15 nm at advanced nodes. This guide covers every dimension of copper CMP slurry: chemistry, process integration, defect failure modes, and the formulation evolution required at 5nm and below.<\/p>\n<\/div>\n\n<div class=\"cmp-trust\">\n  <div class=\"trust-avatar\">&#129520;<\/div>\n  <div class=\"trust-text\">\n    <strong>Jizhi Electronic Technology Co., Ltd. &#8212; BEOL Process Engineering Team<\/strong>\n    <span>\u0421\u043f\u0435\u0446\u0438\u0430\u043b\u0438\u0441\u0442 \u043f\u043e \u0448\u043b\u0430\u043c\u0430\u043c CMP, \u0423\u0441\u0438, \u0426\u0437\u044f\u043d\u0441\u0443. \u0427\u0430\u0441\u0442\u044c <a href=\"https:\/\/jeez-semicon.com\/ru\/blog\/what-is-cmp-slurry-a-complete-guide-to-chemical-mechanical-planarization-slurry\/\">\u041f\u043e\u043b\u043d\u043e\u0435 \u0440\u0443\u043a\u043e\u0432\u043e\u0434\u0441\u0442\u0432\u043e \u043f\u043e \u0448\u043b\u0430\u043c\u0443 CMP<\/a> \u0441\u0435\u0440\u0438\u044f.<\/span>\n  <\/div>\n<\/div>\n\n<!-- Process Flow Banner -->\n<div class=\"process-flow\">\n  <div class=\"pf-step step1\">\n    <span class=\"pfs-label\">Step 1<\/span>\n    <span class=\"pfs-name\">Bulk Cu Removal<\/span>\n    <span class=\"pfs-slurry\">Cu-selective slurry<\/span>\n  <\/div>\n  <div class=\"pf-arrow\">&#8594;<\/div>\n  <div class=\"pf-step step2\">\n    <span class=\"pfs-label\">Step 2<\/span>\n    <span class=\"pfs-name\">\u0411\u0430\u0440\u044c\u0435\u0440 \/ \u0432\u043a\u043b\u0430\u0434\u044b\u0448<\/span>\n    <span class=\"pfs-slurry\">Near-unity selectivity<\/span>\n  <\/div>\n  <div class=\"pf-arrow\">&#8594;<\/div>\n  <div class=\"pf-step step3\">\n    <span class=\"pfs-label\">Step 3 (optional)<\/span>\n    <span class=\"pfs-name\">Dielectric Buff<\/span>\n    <span class=\"pfs-slurry\">Low-MRR oxide polish<\/span>\n  <\/div>\n  <div class=\"pf-arrow\">&#8594;<\/div>\n  <div class=\"pf-step\" style=\"background:linear-gradient(135deg,#4f46e5,#7c3aed);min-width:120px\">\n    <span class=\"pfs-label\">Post-CMP<\/span>\n    <span class=\"pfs-name\">Clean &amp; Inspect<\/span>\n    <span class=\"pfs-slurry\">PVA brush + megasonic<\/span>\n  <\/div>\n<\/div>\n\n<div class=\"cmp-toc\">\n  <h2>&#128203; Table of Contents<\/h2>\n  <ol>\n    <li><a href=\"#why-copper\">Why Copper CMP Is Uniquely Challenging<\/a><\/li>\n    <li><a href=\"#dual-damascene\">The Dual Damascene Process: Why Three CMP Steps?<\/a><\/li>\n    <li><a href=\"#step1\">Step 1: Bulk Copper Removal Slurry<\/a><\/li>\n    <li><a href=\"#step2\">Step 2: Barrier \/ Liner CMP Slurry<\/a><\/li>\n    <li><a href=\"#step3\">Step 3: Dielectric Buff Polish<\/a><\/li>\n    <li><a href=\"#bta\">BTA Chemistry: The Copper CMP Corrosion Inhibitor<\/a><\/li>\n    <li><a href=\"#dishing-erosion\">Dishing &amp; Erosion: The Critical Cu CMP Defects<\/a><\/li>\n    <li><a href=\"#process-parameters\">Key Process Parameters &amp; Their Effect on Cu CMP<\/a><\/li>\n    <li><a href=\"#advanced-nodes\">Copper CMP at Advanced Nodes: 5nm, 3nm &amp; Beyond<\/a><\/li>\n    <li><a href=\"#comparison\">Full Cu CMP Slurry Comparison Table<\/a><\/li>\n    <li><a href=\"#faq\">\u0427\u0430\u0441\u0442\u043e \u0437\u0430\u0434\u0430\u0432\u0430\u0435\u043c\u044b\u0435 \u0432\u043e\u043f\u0440\u043e\u0441\u044b<\/a><\/li>\n  <\/ol>\n<\/div>\n\n<!-- \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 SECTION 1 \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 -->\n<h2 id=\"why-copper\">1. Why Copper CMP Is Uniquely Challenging<\/h2>\n\n<p>Copper was introduced as the primary BEOL interconnect metal by IBM and Motorola in 1997, replacing aluminum in a transition that required simultaneously solving three previously unsolved manufacturing problems: copper deposition into sub-micron trenches and vias (solved by electrochemical deposition, ECD), copper barrier\/liner technology (TaN\/Ta, later Co\/Ru), and copper planarization &#8212; because copper cannot be dry-etched with practical selectivity, making CMP the <em>only<\/em> viable planarization technology for dual damascene copper.<\/p>\n\n<p>This mandatory dependency on CMP for copper patterning makes copper CMP slurry a non-substitutable, process-critical consumable in every BEOL interconnect layer of every advanced logic, DRAM, and mature-node device manufactured today. The fundamental challenges that make copper CMP harder than oxide CMP are:<\/p>\n\n<ul>\n  <li><strong>Electrochemical complexity:<\/strong> Copper is a noble metal with complex oxidation\/reduction behavior. Its CMP must balance active oxidation (for removal) with passivation (to prevent corrosion of already-polished features) &#8212; simultaneously, in the same slurry.<\/li>\n  <li><strong>Multi-material co-planarization:<\/strong> The barrier step must simultaneously remove TaN\/Ta, copper, and SiO&#8322; (or low-k dielectric) at carefully controlled relative rates &#8212; too much Cu removal causes dishing; too much dielectric removal causes erosion.<\/li>\n  <li><strong>Interconnect resistance sensitivity:<\/strong> Dishing and erosion in copper CMP directly translate to increased line resistance and RC delay &#8212; a yield and performance impact that worsens with every node as metal line cross-sections shrink.<\/li>\n  <li><strong>Contamination sensitivity:<\/strong> Cu&#178;&#8314; ions in slurry effluent are highly mobile contaminants that can diffuse into gate oxide if not properly managed in slurry chemistry and post-CMP clean.<\/li>\n<\/ul>\n\n<div class=\"cmp-box blue\">\n  <p class=\"box-title\">&#128204; Copper vs. Tungsten CMP &#8212; Key Differences<\/p>\n  <p style=\"margin:0;\">Tungsten CMP operates in a simple, well-defined regime: high-MRR removal of W in an oxidizing acidic environment with a well-passivated Ti\/TiN stop layer providing natural endpoint. Copper CMP operates in a fundamentally more difficult regime: the &#8220;stop layer&#8221; (TaN\/Ta barrier) is only 3&#8211;5 nm thick and must itself be removed in the subsequent step, the slurry must simultaneously remove and passivate copper, and the process window for acceptable dishing and erosion is measured in single-digit nanometers at advanced nodes. These differences explain why Cu CMP slurry development has historically been the most complex and longest-cycle formulation effort in CMP consumables.<\/p>\n<\/div>\n\n<!-- \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 SECTION 2 \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 -->\n<h2 id=\"dual-damascene\">2. The Dual Damascene Process: Why Three CMP Steps?<\/h2>\n\n<p>The dual damascene copper interconnect process &#8212; the manufacturing flow used for every copper metal layer in advanced semiconductor devices &#8212; creates the multi-step CMP requirement through its fill-then-planarize architecture. In dual damascene, the dielectric layer is first patterned with both the via and trench geometry, then lined with barrier\/liner films (TaN\/Ta or Co\/Ru), and finally filled with electroplated copper. The copper overburden &#8212; the excess copper above the trench level &#8212; can be 1&#8211;3 &#956;m thick on the wafer surface and must be entirely removed while leaving copper only within the trench and via features.<\/p>\n\n<p>This creates an inherently multi-step CMP challenge because no single slurry formulation can optimally serve all three removal objectives:<\/p>\n\n<ul>\n  <li><strong>Bulk Cu removal<\/strong> requires a highly Cu-selective slurry (Cu:barrier &gt;100:1) to rapidly clear the copper overburden without significantly attacking the thin TaN\/Ta barrier &#8212; premature barrier exposure causes barrier-level non-uniformity and yield loss.<\/li>\n  <li><strong>Barrier\/liner removal<\/strong> requires a near-unity selectivity formulation (Cu:Ta:SiO&#8322; &#8776; 1:1:1) that removes the exposed TaN\/Ta barrier while simultaneously controlling the rate of copper and dielectric removal to minimize dishing and erosion &#8212; diametrically opposed to the Step 1 selectivity requirement.<\/li>\n  <li><strong>Dielectric buff<\/strong> (optional) uses a gentle low-MRR oxide polish to remove residual barrier or slurry contamination from the dielectric surface and restore the dielectric surface planarity after Step 2.<\/li>\n<\/ul>\n\n<p>The incompatible selectivity requirements of Steps 1 and 2 are the fundamental reason that copper CMP requires at least two distinct slurry formulations. No chemistry discovered to date can simultaneously achieve Cu:barrier &gt;100:1 (Step 1) and Cu:barrier &#8776; 1:1 (Step 2) &#8212; these are thermodynamically and kinetically mutually exclusive targets. For a detailed discussion of how this fits into the broader <a href=\"https:\/\/jeez-semicon.com\/ru\/blog\/cmp-slurry-types-explained-oxide-sti-copper-tungsten-beyond\/\">CMP slurry types<\/a> taxonomy, see our dedicated article.<\/p>\n\n<!-- \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 SECTION 3 \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 -->\n<h2 id=\"step1\">3. Step 1: Bulk Copper Removal Slurry<\/h2>\n\n<div class=\"step-card step1\">\n  <div class=\"sc-header\">\n    <div class=\"sc-num\">1<\/div>\n    <div>\n      <p class=\"sc-title\">Bulk Copper Removal<\/p>\n      <p class=\"sc-subtitle\">High-selectivity, high-MRR oxidizing slurry &#8212; the workhorse step<\/p>\n    <\/div>\n  <\/div>\n  <div class=\"sc-specs\">\n    <span class=\"sc-pill orange\">pH: 3&#8211;5 (acidic)<\/span>\n    <span class=\"sc-pill orange\">Oxidizer: H&#8322;O&#8322; (1&#8211;5 wt%)<\/span>\n    <span class=\"sc-pill blue\">Cu MRR: 3,000&#8211;8,000 &#8491;\/min<\/span>\n    <span class=\"sc-pill green\">Selectivity Cu:Barrier: &gt;100:1<\/span>\n    <span class=\"sc-pill gray\">Abrasive: Colloidal silica, 30&#8211;80 nm<\/span>\n    <span class=\"sc-pill gray\">Endpoint: Optical (reflectance change at barrier exposure)<\/span>\n  <\/div>\n\n  <h3>Removal Mechanism<\/h3>\n  <p>The bulk copper removal mechanism in Step 1 is a three-stage electrochemical-mechanical cycle operating continuously across the polishing pad:<\/p>\n\n  <div class=\"chem-flow\">\n    <div class=\"chem-box\"><div class=\"cb-formula\">Cu&#8304;<\/div><div class=\"cb-name\">Metallic copper surface<\/div><\/div>\n    <div class=\"chem-arrow\">&#8594;<\/div>\n    <div class=\"chem-box\" style=\"border-color:#f59e0b\"><div class=\"cb-formula\" style=\"color:#b45309\">Cu(OH)&#8322;<\/div><div class=\"cb-name\">H&#8322;O&#8322; oxidation &#8594; soft hydroxide layer<\/div><\/div>\n    <div class=\"chem-arrow\">&#8594;<\/div>\n    <div class=\"chem-box\" style=\"border-color:#0891b2\"><div class=\"cb-formula\" style=\"color:#0369a1\">Cu&#178;&#8314;&#183;L<\/div><div class=\"cb-name\">Chelation &#8594; soluble Cu complex removed in slurry<\/div><\/div>\n    <div class=\"chem-arrow\">&#8594;<\/div>\n    <div class=\"chem-box\" style=\"border-color:#059669\"><div class=\"cb-formula\" style=\"color:#166534\">Cu&#8304;<\/div><div class=\"cb-name\">Fresh surface re-exposed &#8594; cycle repeats<\/div><\/div>\n  <\/div>\n\n  <p>H&#8322;O&#8322; oxidizes the copper surface to Cu(OH)&#8322; or CuO &#8212; mechanically softer than base copper and chemically accessible to chelating agents. Chelators (typically glycine, citric acid, or amino acid derivatives at pH 3&#8211;5) form stable soluble Cu&#178;&#8314; complexes that transport dissolved copper away from the polishing interface in the slurry liquid film. Abrasive particles then remove the hydroxide reaction layer from the topographic peaks, re-exposing fresh metallic copper to oxidative attack. This cycle repeats thousands of times per second across the pad-wafer interface.<\/p>\n\n  <h3>High Selectivity Against the Barrier<\/h3>\n  <p>The Step 1 slurry achieves Cu:barrier selectivity &gt;100:1 through a combination of chemistry and pH design: at pH 3&#8211;5, H&#8322;O&#8322; is an effective copper oxidizer but a poor oxidizer for TaN and Ta, which form stable passivating oxide layers (Ta&#8322;O&#8325;, TaN) that resist the Step 1 chemical environment. The chelating agents are also designed to specifically complex Cu&#178;&#8314; ions rather than Ta or Ti species, maintaining the selectivity advantage. When the copper overburden is cleared and the TaN\/Ta barrier is exposed across the full wafer surface, the change in surface reflectance (copper &#8594; TaN) triggers the optical endpoint detection system, signaling transition to Step 2.<\/p>\n\n  <div class=\"cmp-box amber\">\n    <p class=\"box-title\">&#9888;&#65039; Step 1 Over-Polish Risk<\/p>\n    <p style=\"margin:0;\">After the copper endpoint signal is detected, fabs typically apply 10&#8211;30% over-polish to ensure complete copper clearing across WIWNU variation. Each second of over-polish in Step 1 both consumes additional TaN\/Ta barrier and introduces incremental dishing in wide copper features. Minimizing the required over-polish percentage through improved WIWNU control (better slurry uniformity and pad conditioning) directly reduces the dishing budget consumed before Step 2 begins.<\/p>\n  <\/div>\n<\/div>\n\n<!-- \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 SECTION 4 \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 -->\n<h2 id=\"step2\">4. Step 2: Barrier \/ Liner CMP Slurry<\/h2>\n\n<div class=\"step-card step2\">\n  <div class=\"sc-header\">\n    <div class=\"sc-num\">2<\/div>\n    <div>\n      <p class=\"sc-title\">Barrier \/ Liner Removal<\/p>\n      <p class=\"sc-subtitle\">The hardest step: near-unity selectivity across three mutually competing materials<\/p>\n    <\/div>\n  <\/div>\n  <div class=\"sc-specs\">\n    <span class=\"sc-pill blue\">pH: 6&#8211;9 (near-neutral to mildly alkaline)<\/span>\n    <span class=\"sc-pill blue\">Oxidizer: H&#8322;O&#8322; (&lt;1 wt%, low concentration)<\/span>\n    <span class=\"sc-pill gray\">Cu MRR: 300&#8211;800 &#8491;\/min (controlled)<\/span>\n    <span class=\"sc-pill gray\">TaN\/Ta MRR: 200&#8211;600 &#8491;\/min<\/span>\n    <span class=\"sc-pill gray\">SiO&#8322; MRR: 200&#8211;400 &#8491;\/min<\/span>\n    <span class=\"sc-pill green\">Target selectivity: Cu:Ta:SiO&#8322; &#8776; 1:1:1<\/span>\n    <span class=\"sc-pill orange\">Dishing target: &lt;20 nm (advanced nodes)<\/span>\n  <\/div>\n\n  <h3>The Near-Unity Selectivity Challenge<\/h3>\n  <p>The barrier step is widely regarded as the most formulation-difficult CMP process in production. The challenge is unique: the slurry must remove three fundamentally different materials &#8212; metallic copper (noble, electrochemically active), tantalum nitride (ceramic, chemically inert), and silicon dioxide (amorphous oxide, chemically etchable) &#8212; at nearly equal rates, while simultaneously preventing the over-removal of copper in the wide-line areas (dishing) and the over-removal of dielectric in densely patterned array areas (erosion).<\/p>\n  <p>These objectives are in tension. The slurry&#39;s oxidizer and chelator chemistry that enables copper removal will, if uncontrolled, also cause excessive copper dissolution from already-polished recessed areas (dishing). The abrasive loading and pH that enables dielectric removal will, if unoptimized, cause preferential oxide erosion in dense metal arrays (erosion). The barrier slurry formulation must solve all four objectives simultaneously:<\/p>\n  <ul>\n    <li>Remove TaN\/Ta at &#8805;200 &#8491;\/min to achieve practical cycle times for the 3&#8211;5 nm barrier film<\/li>\n    <li>Maintain Cu removal at a controlled, low rate to planarize residual step height without causing dishing<\/li>\n    <li>Remove SiO&#8322;\/low-k dielectric at a rate matched to copper removal to prevent erosion in array areas<\/li>\n    <li>Suppress copper surface corrosion with inhibitors (BTA derivatives) in recessed features to limit dishing<\/li>\n  <\/ul>\n\n  <h3>Barrier Slurry Formulation Approach<\/h3>\n  <p>Modern barrier CMP slurry formulations achieve near-unity selectivity through a carefully balanced multi-component system: colloidal silica abrasive (30&#8211;60 nm, 3&#8211;6 wt%) provides mechanical removal of all three materials without the extreme hardness bias of alumina; pH 6&#8211;9 is selected to ensure that H&#8322;O&#8322; is an effective but moderate oxidizer for copper while anionic surfactant complexes with Ta&#178;O&#8325; surfaces reduce its effective hardness against abrasive contact; and low-concentration BTA (50&#8211;200 ppm) provides selective copper corrosion inhibition in recessed features where abrasive contact frequency is low, specifically suppressing the dishing component of copper over-removal. For a deeper discussion of how these additive classes function, see our guide on <a href=\"https:\/\/jeez-semicon.com\/ru\/blog\/cmp-slurry-composition-abrasives-chemical-additives-formulation-principles\/\">\u0421\u043e\u0441\u0442\u0430\u0432 \u0448\u043b\u0430\u043c\u0430 CMP<\/a>.<\/p>\n<\/div>\n\n<!-- \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 SECTION 5 \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 -->\n<h2 id=\"step3\">5. Step 3: Dielectric Buff Polish<\/h2>\n\n<div class=\"step-card step3\">\n  <div class=\"sc-header\">\n    <div class=\"sc-num\">3<\/div>\n    <div>\n      <p class=\"sc-title\">Dielectric Buff Polish (Optional)<\/p>\n      <p class=\"sc-subtitle\">Surface restoration and residual contamination removal after barrier step<\/p>\n    <\/div>\n  <\/div>\n  <div class=\"sc-specs\">\n    <span class=\"sc-pill green\">pH: 9&#8211;11 (alkaline oxide)<\/span>\n    <span class=\"sc-pill green\">Abrasive: Low-concentration colloidal silica<\/span>\n    <span class=\"sc-pill gray\">SiO&#8322; MRR: 200&#8211;600 &#8491;\/min<\/span>\n    <span class=\"sc-pill gray\">Cu MRR: &lt;50 &#8491;\/min (suppressed)<\/span>\n    <span class=\"sc-pill blue\">Duration: Short (15&#8211;30 seconds typical)<\/span>\n  <\/div>\n  <p>The optional buff step is deployed in process flows where the barrier step leaves residual TaN particles, barrier film micro-scratches, or slurry chemical contamination on the dielectric surface. A short alkaline oxide slurry buff (15&#8211;30 seconds) polishes the dielectric surface at low MRR, removing the top 50&#8211;100 nm of contaminated dielectric while using very low Cu MRR to avoid adding additional dishing to the already-polished copper features. The buff step significantly reduces the post-CMP clean burden and improves the defect map presented to post-CMP inspection &#8212; at the cost of additional cycle time and slurry consumption. At advanced nodes where every process step matters for cycle time, the buff step is carefully evaluated for cost-vs-benefit in each integration scheme.<\/p>\n<\/div>\n\n<div class=\"cmp-cta\">\n  <h3>Looking for a Copper CMP Slurry Partner?<\/h3>\n  <p>Jizhi Electronic Technology provides CMP polishing slurry with application engineering support from Wuxi, Jiangsu &#8212; serving the Yangtze River Delta semiconductor cluster.<\/p>\n  <a href=\"https:\/\/jeez-semicon.com\/ru\/contact\/\">Request a Technical Consultation &#8594;<\/a>\n<\/div>\n\n<!-- \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 SECTION 6 \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 -->\n<h2 id=\"bta\">6. BTA Chemistry: The Copper CMP Corrosion Inhibitor<\/h2>\n\n<p>Benzotriazole (BTA, C&#8326;H&#8325;N&#8323;) is the canonical corrosion inhibitor for copper CMP slurry and one of the most studied organic additives in the entire CMP formulation literature. Understanding BTA&#39;s mechanism, concentration sensitivity, and limitations is essential for any process engineer working with copper CMP.<\/p>\n\n<h3>How BTA Works<\/h3>\n<p>BTA molecules adsorb onto copper surfaces through their triazole nitrogen atoms, forming a dense, hydrophobic Cu&#8211;BTA complex monolayer. This monolayer acts as a kinetic barrier against further oxidative attack by H&#8322;O&#8322; or dissolved oxygen, dramatically reducing the copper corrosion current in the recessed feature areas where abrasive mechanical contact is minimal. The net effect is that BTA suppresses copper removal selectively in the recessed (already-polished) areas of the pattern while having minimal effect in the topographic peak areas where abrasive contact mechanically disrupts the BTA layer and maintains active copper removal &#8212; exactly the selectivity behavior needed to achieve low dishing.<\/p>\n\n<h3>BTA Concentration Sensitivity<\/h3>\n<div class=\"cmp-box orange\">\n  <p class=\"box-title\">&#128308; BTA: A Double-Edged Additive<\/p>\n  <p style=\"margin:0;\">BTA concentration must be precisely controlled within a narrow optimal window &#8212; typically 50&#8211;300 ppm in Step 2 barrier slurry. <strong>Too little BTA:<\/strong> inadequate corrosion inhibition in recessed Cu features &#8594; excessive dishing; copper surface roughness increases from uncontrolled H&#8322;O&#8322; attack. <strong>Too much BTA:<\/strong> the Cu&#8211;BTA complex forms on topographic copper peaks as well, suppressing the targeted copper removal rate and reducing clearing efficiency; BTA also contributes to post-CMP clean difficulty as a surface residue requiring specific alkaline clean chemistry for removal.<\/p>\n<\/div>\n\n<h3>BTA Environmental and Regulatory Considerations<\/h3>\n<p>BTA is classified as a potential environmental hazard in aqueous effluent due to its resistance to conventional biological wastewater treatment &#8212; it is not readily biodegradable under typical treatment plant conditions. Regulatory pressure in Japan, Europe, and increasingly in China has driven research into BTA-free or reduced-BTA copper CMP slurry formulations using alternative nitrogen-containing heterocyclic inhibitors (benzimidazole derivatives, triazole variants with modified biodegradability profiles). While full BTA elimination in production Cu CMP slurry remains challenging as of 2025, reduced-BTA formulations with improved environmental profiles are commercially available from several leading suppliers.<\/p>\n\n<!-- \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 SECTION 7 \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 -->\n<h2 id=\"dishing-erosion\">7. Dishing &amp; Erosion: The Critical Copper CMP Defects<\/h2>\n\n<p>Dishing and erosion are the two characteristic yield-limiting defects of copper CMP, both arising from the difficulty of controlling simultaneous removal of materials with different mechanical and chemical properties. Understanding their root causes is essential for process engineers optimizing slurry selection and process parameters. For a complete treatment of all CMP defect types, see our article on <a href=\"https:\/\/jeez-semicon.com\/ru\/blog\/cmp-slurry-defects-root-cause-analysis-quality-control-complete-engineering-guide\/\">\u0410\u043d\u0430\u043b\u0438\u0437 \u0434\u0435\u0444\u0435\u043a\u0442\u043e\u0432 \u0438 \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u044c \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0430 \u0448\u043b\u0430\u043c\u0430 CMP<\/a>.<\/p>\n\n<div class=\"defect-diagram\">\n  <div class=\"dd-title\">Copper CMP Defect Mechanisms &#8212; Schematic<\/div>\n  <div class=\"dd-row\">\n    <div class=\"dd-panel\">\n      <div class=\"ddp-label\">&#10004; Ideal Result<\/div>\n      <div class=\"ddp-visual\">\n        <div class=\"ddp-dielectric\"><\/div>\n        <div class=\"ddp-metal\" style=\"left:10%;right:10%;height:14px;background:#f59e0b;bottom:36px;border-radius:0\"><\/div>\n      <\/div>\n      <div class=\"ddp-caption\">Cu surface flush with dielectric. No height differential. Target state post-barrier CMP.<\/div>\n    <\/div>\n    <div class=\"dd-panel\">\n      <div class=\"ddp-label\">&#128308; Dishing (Wide Cu Lines)<\/div>\n      <div class=\"ddp-visual\">\n        <div class=\"ddp-dielectric\"><\/div>\n        <div style=\"position:absolute;bottom:36px;left:10%;right:10%;height:14px;background:linear-gradient(180deg,#b45309,#92400e);clip-path:ellipse(50% 60% at 50% 0%);\"><\/div>\n      <\/div>\n      <div class=\"ddp-caption\">Cu center recessed below dielectric level. Caused by: over-polish, high oxidizer in recessed area, insufficient BTA.<\/div>\n    <\/div>\n    <div class=\"dd-panel\">\n      <div class=\"ddp-label\">&#128308; Erosion (Dense Arrays)<\/div>\n      <div class=\"ddp-visual\">\n        <div style=\"position:absolute;bottom:0;left:0;right:0;height:28px;background:#cbd5e1\"><\/div>\n        <div style=\"position:absolute;bottom:28px;left:5%;width:12%;height:12px;background:#f59e0b\"><\/div>\n        <div style=\"position:absolute;bottom:28px;left:22%;width:12%;height:12px;background:#f59e0b\"><\/div>\n        <div style=\"position:absolute;bottom:28px;left:39%;width:12%;height:12px;background:#f59e0b\"><\/div>\n        <div style=\"position:absolute;bottom:28px;left:56%;width:12%;height:12px;background:#f59e0b\"><\/div>\n        <div style=\"position:absolute;bottom:28px;left:73%;width:12%;height:12px;background:#f59e0b\"><\/div>\n      <\/div>\n      <div class=\"ddp-caption\">Dielectric field between dense Cu lines removed below target level. Caused by: high dielectric MRR, dense pattern pressure buildup.<\/div>\n    <\/div>\n  <\/div>\n<\/div>\n\n<div class=\"cmp-table-wrap\">\n  <table class=\"cmp-table\">\n    <thead>\n      <tr>\n        <th>Defect<\/th>\n        <th>Definition<\/th>\n        <th>Root Cause<\/th>\n        <th>Primary Mitigation<\/th>\n        <th>Spec Target (&lt;5nm node)<\/th>\n      <\/tr>\n    <\/thead>\n    <tbody>\n      <tr>\n        <td><strong>\u0411\u043b\u044e\u0434\u0430<\/strong><\/td>\n        <td>Cu surface below surrounding dielectric in wide isolated lines (&#8805;5 &#956;m width)<\/td>\n        <td>Pad bending over wide features; over-oxidation of Cu in recessed areas; inadequate BTA; Step 1 over-polish<\/td>\n        <td>Increase BTA concentration; reduce H&#8322;O&#8322;; optimize Step 1 endpoint; harder pad<\/td>\n        <td>&lt;20 nm at 10 &#956;m line width<\/td>\n      <\/tr>\n      <tr>\n        <td><strong>Erosion<\/strong><\/td>\n        <td>Dielectric field recessed below target level in dense Cu array areas<\/td>\n        <td>High effective pad pressure on dense Cu arrays; high dielectric MRR in Step 2 slurry; inadequate Cu:dielectric selectivity control<\/td>\n        <td>Reduce Step 2 dielectric MRR; adjust pH; optimize abrasive concentration; use softer pad<\/td>\n        <td>&lt;15 nm over 50% density arrays<\/td>\n      <\/tr>\n      <tr>\n        <td><strong>Cu Corrosion \/ Pitting<\/strong><\/td>\n        <td>Localized Cu surface pits from galvanic or chemical dissolution<\/td>\n        <td>Insufficient BTA; excessive H&#8322;O&#8322; at low abrasion contact; galvanic coupling at Cu\/TaN interface<\/td>\n        <td>Increase inhibitor concentration; reduce H&#8322;O&#8322;; check pad conditioner uniformity<\/td>\n        <td>Zero visible pits (&gt;30 nm diameter)<\/td>\n      <\/tr>\n      <tr>\n        <td><strong>TaN Residue<\/strong><\/td>\n        <td>Incompletely removed barrier film on dielectric surface<\/td>\n        <td>Insufficient Step 2 TaN MRR; low over-polish; WIWNU of Step 2 exceeds tolerance<\/td>\n        <td>Increase Step 2 over-polish; improve WIWNU; add buff step<\/td>\n        <td>Zero TaN residue by EDX inspection<\/td>\n      <\/tr>\n      <tr>\n        <td><strong>Micro-scratches<\/strong><\/td>\n        <td>Surface scratches in Cu or dielectric from abrasive particle contacts<\/td>\n        <td>LPC spikes in slurry; agglomerated particles; pad contamination; slurry instability<\/td>\n        <td>Tighten incoming LPC spec; improve POU filtration; check slurry temperature\/age<\/td>\n        <td>&lt;5 critical scratches\/wafer (post-clean)<\/td>\n      <\/tr>\n    <\/tbody>\n  <\/table>\n<\/div>\n\n<!-- \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 SECTION 8 \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 -->\n<h2 id=\"process-parameters\">8. Key Process Parameters &amp; Their Effect on Copper CMP<\/h2>\n\n<div class=\"cmp-table-wrap\">\n  <table class=\"cmp-table\">\n    <thead>\n      <tr>\n        <th>\u041f\u0430\u0440\u0430\u043c\u0435\u0442\u0440<\/th>\n        <th>\u0422\u0438\u043f\u0438\u0447\u043d\u044b\u0439 \u0434\u0438\u0430\u043f\u0430\u0437\u043e\u043d<\/th>\n        <th>Effect on Cu MRR<\/th>\n        <th>Effect on Dishing<\/th>\n        <th>Effect on Defectivity<\/th>\n      <\/tr>\n    <\/thead>\n    <tbody>\n      <tr>\n        <td><strong>Downforce (pressure)<\/strong><\/td>\n        <td>0.5&#8211;3.0 psi<\/td>\n        <td>&#8593; Increases (Preston&#39;s law)<\/td>\n        <td>&#8593; Increases (pad deflection over Cu)<\/td>\n        <td>&#8593; Increases (abrasive contact energy)<\/td>\n      <\/tr>\n      <tr>\n        <td><strong>Platen \/ wafer velocity<\/strong><\/td>\n        <td>50&#8211;120 rpm<\/td>\n        <td>&#8593; Increases (Preston&#39;s law)<\/td>\n        <td>&#8594; Moderate effect<\/td>\n        <td>&#8595; Decreases (better slurry refresh)<\/td>\n      <\/tr>\n      <tr>\n        <td><strong>H&#8322;O&#8322; concentration<\/strong><\/td>\n        <td>0.5&#8211;5 wt% (step-dependent)<\/td>\n        <td>&#8593; Increases (to plateau)<\/td>\n        <td>&#8593; Increases (more Cu corrosion)<\/td>\n        <td>&#8593; Pitting risk at high concentration<\/td>\n      <\/tr>\n      <tr>\n        <td><strong>BTA concentration<\/strong><\/td>\n        <td>50&#8211;300 ppm<\/td>\n        <td>&#8595; Decreases<\/td>\n        <td>&#8595;&#8595; Significantly reduces<\/td>\n        <td>&#8594; Neutral to slightly positive<\/td>\n      <\/tr>\n      <tr>\n        <td><strong>pH<\/strong><\/td>\n        <td>3&#8211;5 (Step 1); 6&#8211;9 (Step 2)<\/td>\n        <td>Context-dependent<\/td>\n        <td>&#8595; Higher pH reduces Cu corrosion<\/td>\n        <td>&#8594; Higher pH improves silica stability<\/td>\n      <\/tr>\n      <tr>\n        <td><strong>Slurry flow rate<\/strong><\/td>\n        <td>150&#8211;300 mL\/min<\/td>\n        <td>&#8594; Weak effect<\/td>\n        <td>&#8594; Minimal<\/td>\n        <td>&#8595; Higher flow reduces particle stagnation<\/td>\n      <\/tr>\n      <tr>\n        <td><strong>Slurry temperature<\/strong><\/td>\n        <td>20&#8211;25&#176;C (controlled)<\/td>\n        <td>&#8593; Increases with T (H&#8322;O&#8322; rate &#8593;)<\/td>\n        <td>&#8593; Higher T increases corrosion rate<\/td>\n        <td>&#8593; H&#8322;O&#8322; decomposition rate &#8593; with T<\/td>\n      <\/tr>\n      <tr>\n        <td><strong>Pad conditioning<\/strong><\/td>\n        <td>In-situ continuous<\/td>\n        <td>&#8594; Maintains baseline<\/td>\n        <td>&#8594; Maintains uniformity<\/td>\n        <td>&#8595; Glazed pad &#8594; slurry starvation &#8594; &#8593; scratch<\/td>\n      <\/tr>\n    <\/tbody>\n  <\/table>\n<\/div>\n\n<!-- \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 SECTION 9 \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 -->\n<h2 id=\"advanced-nodes\">9. Copper CMP at Advanced Nodes: 5nm, 3nm &amp; Beyond<\/h2>\n\n<p>As copper interconnect dimensions shrink below 10 nm half-pitch at 5nm and 3nm nodes, the copper CMP process faces a set of challenges that push the boundaries of conventional slurry formulation and process control. Three specific issues dominate the advanced-node copper CMP landscape:<\/p>\n\n<h3>9.1 The Resistance &#8594; Dishing Coupling Problem<\/h3>\n<p>At 28nm, a 10 nm dishing depth in a 100 nm wide copper line reduces the effective line cross-section by 10% &#8212; a meaningful but manageable RC impact. At 5nm, the same 10 nm dishing in a 20 nm wide line reduces the cross-section by 50% &#8212; a catastrophic resistance increase that violates timing margins. This geometric sensitivity means that dishing specifications at advanced nodes have tightened from &lt;50 nm (28nm generation) to &lt;20 nm (10nm generation) to &lt;10 nm (5nm node target) &#8212; each generation requiring fundamentally more precise BTA concentration control, H&#8322;O&#8322; concentration stability, and Step 1 endpoint accuracy.<\/p>\n\n<h3>9.2 Low-k Dielectric Integration<\/h3>\n<p>As covered in our article on <a href=\"https:\/\/jeez-semicon.com\/ru\/blog\/cmp-slurry-for-advanced-nodes-5nm-3nm-2nm-beyond-technical-challenges-innovations\/\">CMP Slurry for Advanced Nodes<\/a>, the ultra-low-k (ULK) dielectric used in advanced BEOL layers (k &lt; 2.5) is mechanically fragile. Copper CMP Step 2 slurry in contact with ULK dielectric must apply significantly lower abrasive mechanical stress than would be acceptable on dense SiO&#8322;, requiring re-optimized abrasive concentration, particle size, and downforce settings that may compromise TaN removal rate and require extended Step 2 polish times &#8212; which in turn increases the over-polish-driven dishing and erosion.<\/p>\n\n<h3>9.3 Cobalt and Ruthenium Liner Integration<\/h3>\n<p>At 10nm and below, the TaN\/Ta barrier\/liner system is being replaced or supplemented with cobalt (Co) and ruthenium (Ru) liners to reduce barrier thickness and improve copper fill in narrow vias. Copper CMP Step 2 slurry must now achieve near-unity selectivity across <em>four<\/em> materials (Cu, TaN, Co\/Ru, and low-k dielectric) rather than three &#8212; a dramatically more complex formulation target. Co and Ru have different electrochemical potentials than Ta, changing the galvanic coupling dynamics at the Cu\/liner interface and requiring reoptimization of the inhibitor and oxidizer systems. As of 2025, Co-liner-compatible barrier CMP slurry is in production at leading fabs, while Ru-liner-compatible formulations remain in active development.<\/p>\n\n<div class=\"cmp-box green\">\n  <p class=\"box-title\">&#9989; Advanced Node Cu CMP: Key Slurry Requirements<\/p>\n  <p style=\"margin:0;\">For sub-10nm node copper CMP slurry qualification, the minimum specification set should include: dishing &lt;15 nm at 10 &#956;m test line; erosion &lt;12 nm at 50% density array; Cu MRR uniformity WIWNU &lt;2% (1&#963;); micro-scratch count &lt;5 post-clean; H&#8322;O&#8322; lot-to-lot assay &#177;3%; BTA concentration &#177;5%; trace Cu, Na, K, Fe, Ta &lt;5 ppb each (ICP-MS); and colloidal silica D99 &lt;150 nm with LPC (&gt;0.5 &#956;m) &lt;50\/mL.<\/p>\n<\/div>\n\n<!-- \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 SECTION 10 \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 -->\n<h2 id=\"comparison\">10. Full Copper CMP Slurry Comparison: Step 1 vs. Step 2 vs. Step 3<\/h2>\n\n<div class=\"cmp-table-wrap\">\n  <table class=\"cmp-table\">\n    <thead>\n      <tr>\n        <th>\u041f\u0430\u0440\u0430\u043c\u0435\u0442\u0440<\/th>\n        <th>Step 1: Bulk Cu<\/th>\n        <th>Step 2: Barrier\/Liner<\/th>\n        <th>Step 3: Dielectric Buff<\/th>\n      <\/tr>\n    <\/thead>\n    <tbody>\n      <tr><td><strong>Primary Target<\/strong><\/td><td>Cu overburden (1&#8211;3 &#956;m)<\/td><td>TaN\/Ta barrier (3&#8211;5 nm)<\/td><td>Dielectric surface restoration<\/td><\/tr>\n      <tr><td><strong>pH Range<\/strong><\/td><td>3&#8211;5 (acidic)<\/td><td>6&#8211;9 (near-neutral to alkaline)<\/td><td>9&#8211;11 (alkaline)<\/td><\/tr>\n      <tr><td><strong>Oxidizer<\/strong><\/td><td>H&#8322;O&#8322; 1&#8211;5 wt%<\/td><td>H&#8322;O&#8322; 0.1&#8211;1 wt% (low)<\/td><td>None or trace<\/td><\/tr>\n      <tr><td><strong>\u0410\u0431\u0440\u0430\u0437\u0438\u0432<\/strong><\/td><td>Colloidal silica, 30&#8211;80 nm, 3&#8211;8 wt%<\/td><td>Colloidal silica, 20&#8211;60 nm, 2&#8211;5 wt%<\/td><td>Colloidal silica, 20&#8211;50 nm, 1&#8211;3 wt%<\/td><\/tr>\n      <tr><td><strong>Chelating Agent<\/strong><\/td><td>Glycine, citric acid, amino acid (high conc.)<\/td><td>Low-concentration chelator<\/td><td>None or very low<\/td><\/tr>\n      <tr><td><strong>BTA \/ Inhibitor<\/strong><\/td><td>Low or none (high MRR needed)<\/td><td>50&#8211;300 ppm BTA (critical)<\/td><td>Low or none<\/td><\/tr>\n      <tr><td><strong>Cu MRR<\/strong><\/td><td>3,000&#8211;8,000 &#8491;\/min<\/td><td>300&#8211;800 &#8491;\/min<\/td><td>&lt;50 &#8491;\/min<\/td><\/tr>\n      <tr><td><strong>TaN\/Ta MRR<\/strong><\/td><td>&lt;50 &#8491;\/min (suppressed)<\/td><td>200&#8211;600 &#8491;\/min<\/td><td>&lt;10 &#8491;\/min<\/td><\/tr>\n      <tr><td><strong>SiO&#8322; MRR<\/strong><\/td><td>&lt;30 &#8491;\/min (suppressed)<\/td><td>200&#8211;400 &#8491;\/min<\/td><td>200&#8211;600 &#8491;\/min<\/td><\/tr>\n      <tr><td><strong>Cu:Barrier Selectivity<\/strong><\/td><td>&gt;100:1<\/td><td>&#8776; 1:1&#8211;2:1<\/td><td>\u041d\/\u0414<\/td><\/tr>\n      <tr><td><strong>Dishing Risk<\/strong><\/td><td>Low (fast removal, no wide-line contact)<\/td><td>High (critical step for dishing control)<\/td><td>Very low<\/td><\/tr>\n      <tr><td><strong>Endpoint Method<\/strong><\/td><td>Optical (reflectance at barrier exposure)<\/td><td>Motor current + optional optical<\/td><td>Timed<\/td><\/tr>\n      <tr><td><strong>Typical Duration<\/strong><\/td><td>60&#8211;180 seconds<\/td><td>30&#8211;90 seconds<\/td><td>15&#8211;30 seconds<\/td><\/tr>\n      <tr class=\"highlight\"><td><strong>Most Critical Spec<\/strong><\/td><td>Cu MRR uniformity (WIWNU); Step 1 endpoint accuracy<\/td><td>Dishing (&lt;20 nm); TaN clearing; Cu:SiO&#8322; balance<\/td><td>Residual defect count; surface roughness<\/td><\/tr>\n    <\/tbody>\n  <\/table>\n<\/div>\n\n<!-- \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 SECTION 11 \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 -->\n<h2 id=\"faq\">11. \u0427\u0430\u0441\u0442\u043e \u0437\u0430\u0434\u0430\u0432\u0430\u0435\u043c\u044b\u0435 \u0432\u043e\u043f\u0440\u043e\u0441\u044b<\/h2>\n\n<div class=\"cmp-faq\" itemscope itemtype=\"https:\/\/schema.org\/FAQPage\">\n\n  <div class=\"faq-item\" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n    <p class=\"faq-question\" itemprop=\"name\">Why does copper CMP require two different slurries instead of one?<\/p>\n    <div class=\"faq-answer\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n      <div itemprop=\"text\">The bulk Cu removal step (Step 1) requires Cu:barrier selectivity &gt;100:1 to rapidly remove copper overburden without attacking the thin TaN\/Ta barrier. The barrier removal step (Step 2) requires Cu:Ta:SiO&#8322; selectivity near 1:1:1 to remove the barrier while controlling dishing and erosion. These selectivity requirements are mutually exclusive &#8212; no single slurry formulation can simultaneously achieve both. The acidic, high-H&#8322;O&#8322; chemistry that delivers Step 1 selectivity would cause catastrophic dishing if used in the barrier step, while the near-neutral, low-H&#8322;O&#8322; barrier chemistry would require unacceptably long polish times to clear copper overburden in Step 1.<\/div>\n    <\/div>\n  <\/div>\n\n  <div class=\"faq-item\" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n    <p class=\"faq-question\" itemprop=\"name\">What causes copper CMP dishing and how is it controlled?<\/p>\n    <div class=\"faq-answer\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n      <div itemprop=\"text\">Dishing has two primary causes: (1) mechanical &#8212; the CMP pad deflects over wide copper lines, maintaining abrasive contact on the copper surface even after the surrounding dielectric has cleared, causing continued copper removal; (2) chemical &#8212; in recessed copper features, H&#8322;O&#8322; continues to chemically oxidize and dissolve copper even where abrasive contact is minimal, particularly if BTA concentration is insufficient. Control strategies include: increasing BTA concentration to suppress chemical dissolution in recessed areas; reducing H&#8322;O&#8322; concentration in Step 2; minimizing Step 1 over-polish time through improved endpoint detection; and using harder pads that deflect less over wide features.<\/div>\n    <\/div>\n  <\/div>\n\n  <div class=\"faq-item\" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n    <p class=\"faq-question\" itemprop=\"name\">What is the role of hydrogen peroxide (H&#8322;O&#8322;) in copper CMP slurry?<\/p>\n    <div class=\"faq-answer\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n      <div itemprop=\"text\">H&#8322;O&#8322; is the primary oxidizer in copper CMP slurry. It converts the metallic copper surface to Cu(OH)&#8322; or CuO &#8212; a mechanically softer oxide layer that abrasive particles can remove more efficiently than base copper metal. Without H&#8322;O&#8322;, the removal rate of copper by abrasive alone is very low because metallic copper is ductile and smears rather than fragmenting under abrasive contact. H&#8322;O&#8322; concentration directly controls copper MRR in Step 1 and must be tightly controlled in Step 2 to balance TaN removal with dishing prevention. H&#8322;O&#8322; is also thermally unstable &#8212; elevated slurry temperatures accelerate its decomposition, causing lot-to-lot MRR variability if slurry temperature is not controlled.<\/div>\n    <\/div>\n  <\/div>\n\n  <div class=\"faq-item\" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n    <p class=\"faq-question\" itemprop=\"name\">How does copper CMP change at 5nm and below?<\/p>\n    <div class=\"faq-answer\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n      <div itemprop=\"text\">At 5nm and below, copper CMP faces three compounding challenges: (1) dishing specifications tighten to &lt;10&#8211;15 nm because the geometric sensitivity of line resistance to dishing depth increases as metal cross-sections shrink, requiring tighter BTA and H&#8322;O&#8322; control; (2) ULK dielectric fragility forces lower abrasive pressure in Step 2, constraining TaN removal rate and extending polish times; and (3) cobalt and ruthenium liner materials at &#8804;10nm nodes require barrier slurry to achieve near-unity selectivity across four materials (Cu, TaN, Co\/Ru, and dielectric) instead of three, demanding new inhibitor and oxidizer co-optimization that does not yet have a fully established commercial solution for Ru-liner flows.<\/div>\n    <\/div>\n  <\/div>\n\n  <div class=\"faq-item\" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n    <p class=\"faq-question\" itemprop=\"name\">How should copper CMP slurry be stored to prevent H&#8322;O&#8322; degradation?<\/p>\n    <div class=\"faq-answer\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n      <div itemprop=\"text\">Hydrogen peroxide decomposes according to: 2H&#8322;O&#8322; &#8594; 2H&#8322;O + O&#8322;, with the rate accelerating exponentially with temperature and in the presence of transition metal ion catalysts (Fe&#178;&#8314;, Cu&#178;&#8314;, Mn&#178;&#8314;). To minimize H&#8322;O&#8322; decomposition in Cu CMP slurry: store below 20&#176;C in temperature-controlled distribution systems; use stainless steel (316L) or high-density polyethylene (HDPE) distribution piping &#8212; not bare copper or iron; keep residence time in distribution loops below 24 hours; monitor H&#8322;O&#8322; assay at incoming inspection and at point-of-use; and use slurry within the manufacturer&#39;s specified shelf life (typically 3&#8211;6 months after manufacture for H&#8322;O&#8322;-containing Cu CMP formulations). For complete slurry handling guidance, see our article on <a href=\"https:\/\/jeez-semicon.com\/ru\/blog\/cmp-slurry-filters-storage-handling-complete-engineering-guide\/\">\u0424\u0438\u043b\u044c\u0442\u0440\u044b \u0434\u043b\u044f \u0448\u043b\u0430\u043c\u0430 CMP, \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u0435 \u0438 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0430<\/a>.<\/div>\n    <\/div>\n  <\/div>\n\n<\/div>\n\n<h2>\u0417\u0430\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435<\/h2>\n<p>Copper CMP slurry is the most chemically complex and process-integration-sensitive consumable in BEOL semiconductor manufacturing. The three-step dual damascene polishing sequence &#8212; bulk Cu removal, barrier\/liner planarization, and optional dielectric buff &#8212; requires three mutually incompatible slurry formulations, each engineered to optimize a different set of competing performance objectives. The BTA-H&#8322;O&#8322;-chelator chemistry triangle at the heart of copper CMP formulation has been refined over 25+ years of production learning, but continues to evolve as advanced nodes push dishing tolerances to single-digit nanometers and introduce new barrier materials that redefine the selectivity target space.<\/p>\n<p>For process engineers, the most important insight from this guide is that copper CMP performance is driven as much by the precision of process parameter control &#8212; H&#8322;O&#8322; assay, BTA concentration, slurry temperature, Step 1 over-polish percentage &#8212; as by the intrinsic formulation of the slurry itself. A well-formulated slurry run at poorly controlled process conditions will underperform a moderately formulated slurry run with disciplined process control. For foundational slurry chemistry knowledge, return to our guide on <a href=\"https:\/\/jeez-semicon.com\/ru\/blog\/cmp-slurry-composition-abrasives-chemical-additives-formulation-principles\/\">\u0421\u043e\u0441\u0442\u0430\u0432 \u0448\u043b\u0430\u043c\u0430 CMP<\/a>. For the full CMP slurry landscape, revisit the <a href=\"https:\/\/jeez-semicon.com\/ru\/blog\/what-is-cmp-slurry-a-complete-guide-to-chemical-mechanical-planarization-slurry\/\">\u041f\u043e\u043b\u043d\u043e\u0435 \u0440\u0443\u043a\u043e\u0432\u043e\u0434\u0441\u0442\u0432\u043e \u043f\u043e \u0448\u043b\u0430\u043c\u0443 CMP<\/a>.<\/p>\n\n<a class=\"back-to-pillar\" href=\"https:\/\/jeez-semicon.com\/ru\/blog\/what-is-cmp-slurry-a-complete-guide-to-chemical-mechanical-planarization-slurry\/\">\n  <span class=\"btp-icon\">&#127968;<\/span>\n  <div class=\"btp-text\">\n    <span class=\"btp-label\">\u0427\u0430\u0441\u0442\u044c \u043f\u043e\u043b\u043d\u043e\u0439 \u0441\u0435\u0440\u0438\u0438 CMP Slurry<\/span>\n    <span class=\"btp-title\">&#8592; Back to: What Is CMP Slurry? A Complete Guide<\/span>\n  <\/div>\n<\/a>\n\n\n<\/article>\n\n<script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"headline\":\"Copper CMP Slurry: Dual Damascene Process, Formulation & Defect Control Guide (2025)\",\"description\":\"Complete guide to copper CMP slurry covering dual damascene three-step process sequence, bulk Cu and barrier step formulation, BTA chemistry, dishing and erosion defect control, and advanced node Cu CMP challenges at 5nm and below.\",\"author\":{\"@type\":\"Organization\",\"name\":\"Jizhi Electronic Technology Co., Ltd.\"},\"publisher\":{\"@type\":\"Organization\",\"name\":\"Jizhi Electronic Technology Co., Ltd.\",\"logo\":{\"@type\":\"ImageObject\",\"url\":\"https:\/\/yourwebsite.com\/logo.png\"}},\"datePublished\":\"2025-06-01\",\"dateModified\":\"2025-06-01\",\"mainEntityOfPage\":\"https:\/\/yourwebsite.com\/copper-cmp-slurry\/\",\"isPartOf\":{\"@type\":\"WebPage\",\"@id\":\"https:\/\/yourwebsite.com\/cmp-slurry-complete-guide\/\"}},{\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Why does copper CMP require two different slurries instead of one?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Step 1 requires Cu:barrier selectivity >100:1 for rapid overburden removal; Step 2 requires Cu:Ta:SiO2 selectivity near 1:1:1 for dishing\/erosion control. These are mutually exclusive selectivity targets that no single formulation can achieve simultaneously.\"}},{\"@type\":\"Question\",\"name\":\"What causes copper CMP dishing and how is it controlled?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Dishing has mechanical causes (pad deflection over wide Cu lines) and chemical causes (H2O2 oxidation of Cu in recessed areas with insufficient BTA protection). Control strategies include increasing BTA concentration, reducing H2O2 in Step 2, minimizing Step 1 over-polish, and using harder pads.\"}},{\"@type\":\"Question\",\"name\":\"How does copper CMP change at 5nm and below?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"At 5nm, dishing specs tighten to <10-15nm due to geometric resistance sensitivity; ULK dielectric fragility constrains Step 2 abrasive pressure; and Co\/Ru liner materials require barrier slurry to achieve near-unity selectivity across four materials instead of three.\"}}]},{\"@type\":\"BreadcrumbList\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/yourwebsite.com\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"CMP Slurry Complete Guide\",\"item\":\"https:\/\/yourwebsite.com\/cmp-slurry-complete-guide\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Copper CMP Slurry\",\"item\":\"https:\/\/yourwebsite.com\/copper-cmp-slurry\/\"}]}]}\n<\/script>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>Copper CMP is the most chemically complex and process-sensitive step in BEOL semiconductor manufacturing. A three-stage polishing sequence &#8212; each requiring a fundamentally different slurry chemistry &#8212; must deliver bulk  &#8230;<\/p>","protected":false},"author":1,"featured_media":1506,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[9,59],"tags":[],"class_list":["post-1486","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-industry"],"acf":[],"_links":{"self":[{"href":"https:\/\/jeez-semicon.com\/ru\/wp-json\/wp\/v2\/posts\/1486","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jeez-semicon.com\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jeez-semicon.com\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jeez-semicon.com\/ru\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jeez-semicon.com\/ru\/wp-json\/wp\/v2\/comments?post=1486"}],"version-history":[{"count":5,"href":"https:\/\/jeez-semicon.com\/ru\/wp-json\/wp\/v2\/posts\/1486\/revisions"}],"predecessor-version":[{"id":1560,"href":"https:\/\/jeez-semicon.com\/ru\/wp-json\/wp\/v2\/posts\/1486\/revisions\/1560"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/jeez-semicon.com\/ru\/wp-json\/wp\/v2\/media\/1506"}],"wp:attachment":[{"href":"https:\/\/jeez-semicon.com\/ru\/wp-json\/wp\/v2\/media?parent=1486"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jeez-semicon.com\/ru\/wp-json\/wp\/v2\/categories?post=1486"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jeez-semicon.com\/ru\/wp-json\/wp\/v2\/tags?post=1486"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}