{"id":2382,"date":"2026-06-24T10:15:13","date_gmt":"2026-06-24T02:15:13","guid":{"rendered":"https:\/\/jeez-semicon.com\/?p=2382"},"modified":"2026-06-24T10:15:13","modified_gmt":"2026-06-24T02:15:13","slug":"cmp-slurry-for-semiconductor-planarization-chemistry-types-selection","status":"publish","type":"post","link":"https:\/\/jeez-semicon.com\/de\/blog\/cmp-slurry-for-semiconductor-planarization-chemistry-types-selection\/","title":{"rendered":"CMP Slurry for Semiconductor Planarization: Chemistry, Types &amp; Selection"},"content":{"rendered":"<!-- JEEZ | Cluster 04 | CMP Slurry for Semiconductor Planarization: Chemistry, Types & Selection -->\n<link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\">\n<link rel=\"preconnect\" href=\"https:\/\/fonts.gstatic.com\" crossorigin>\n<link href=\"https:\/\/fonts.googleapis.com\/css2?family=Syne:wght@600;700;800&#038;family=Inter:ital,wght@0,400;0,500;0,600;1,400&#038;display=swap\" rel=\"stylesheet\">\n<style>\n.jeez-pl*,.jeez-pl*::before,.jeez-pl*::after{box-sizing:border-box}\n.jeez-pl{--jz-navy:#0B1D3A;--jz-teal:#0D9488;--jz-teal-dark:#0A7A70;--jz-teal-xlight:#F0FDFB;--jz-blue:#1D6FA4;--jz-blue-lite:#EFF8FF;--jz-text:#1E293B;--jz-muted:#64748B;--jz-border:#E2E8F0;--jz-bg:#F8FAFC;--jz-gold:#B45309;--jz-gold-lite:#FFFBEB;--jz-white:#FFFFFF;--jz-radius:10px;font-family:'Inter',system-ui,sans-serif;font-size:16px;line-height:1.78;color:var(--jz-text);max-width:880px;margin:0 auto;padding:0 16px 60px}\n.jeez-pl .jz-hero{background:linear-gradient(140deg,#0B1D3A 0%,#0D2B4E 55%,#0F3A60 100%);border-radius:16px;padding:52px 48px 44px;margin-bottom:40px;position:relative;overflow:hidden}\n.jeez-pl .jz-hero::before{content:'';position:absolute;inset:0;background:repeating-linear-gradient(0deg,transparent 0px,transparent 39px,rgba(13,148,136,.07) 39px,rgba(13,148,136,.07) 40px);pointer-events:none}\n.jeez-pl .jz-hero-eyebrow{display:inline-flex;align-items:center;background:rgba(13,148,136,.18);color:#5EEAD4;font-size:11px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;padding:4px 14px;border-radius:99px;border:1px solid rgba(94,234,212,.28);margin-bottom:20px;position:relative;z-index:1}\n.jeez-pl .jz-hero h1{font-family:'Syne',sans-serif;font-size:clamp(1.55rem,3.5vw,2.35rem);font-weight:800;color:#fff;line-height:1.18;margin:0 0 20px;position:relative;z-index:1;max-width:700px}\n.jeez-pl .jz-hero-lead{color:rgba(255,255,255,.77);font-size:1.04rem;line-height:1.76;max-width:660px;margin:0 0 26px;position:relative;z-index:1}\n.jeez-pl .jz-hero-meta{display:flex;flex-wrap:wrap;align-items:center;gap:6px 14px;font-size:12px;color:rgba(255,255,255,.5);position:relative;z-index:1}\n.jeez-pl .jz-hero-meta .jz-pipe{color:rgba(255,255,255,.25)}\n.jeez-pl .jz-hero-meta strong{color:#5EEAD4;font-weight:600}\n.jeez-pl .jz-back-link{display:inline-flex;align-items:center;gap:6px;font-size:12.5px;font-weight:600;color:var(--jz-muted);text-decoration:none;margin-bottom:18px;padding:5px 14px;border:1px solid var(--jz-border);border-radius:99px;background:var(--jz-bg)}\n.jeez-pl .jz-back-link:hover{color:var(--jz-teal);text-decoration:none}\n.jeez-pl .jz-toc{background:var(--jz-bg);border:1px solid var(--jz-border);border-left:4px solid var(--jz-teal);border-radius:var(--jz-radius);padding:26px 30px 22px;margin-bottom:46px}\n.jeez-pl .jz-toc-label{font-size:11px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--jz-teal);margin-bottom:14px;display:block}\n.jeez-pl .jz-toc ol{margin:0;padding-left:18px;columns:2;column-gap:28px}\n.jeez-pl .jz-toc li{margin-bottom:8px;font-size:13.5px;break-inside:avoid;line-height:1.4}\n.jeez-pl .jz-toc a{color:var(--jz-blue);text-decoration:none;font-weight:500}\n.jeez-pl .jz-toc a:hover{color:var(--jz-teal)}\n.jeez-pl section{margin-bottom:52px}\n.jeez-pl h2{font-family:'Syne',sans-serif;font-size:1.52rem;font-weight:800;color:var(--jz-navy);margin:0 0 18px;padding-bottom:13px;border-bottom:2px solid var(--jz-border);line-height:1.25;scroll-margin-top:24px}\n.jeez-pl h2 .jz-sn{color:var(--jz-teal);font-size:.88rem;margin-right:8px;font-weight:700}\n.jeez-pl h3{font-family:'Syne',sans-serif;font-size:1.1rem;font-weight:700;color:var(--jz-navy);margin:30px 0 10px;line-height:1.35}\n.jeez-pl h4{font-size:.95rem;font-weight:600;color:var(--jz-navy);margin:16px 0 6px}\n.jeez-pl p{margin:0 0 16px}\n.jeez-pl p:last-child{margin-bottom:0}\n.jeez-pl a{color:var(--jz-teal);font-weight:500;text-decoration:none}\n.jeez-pl a:hover{color:var(--jz-teal-dark);text-decoration:underline}\n.jeez-pl ul,.jeez-pl ol{margin:10px 0 16px;padding-left:22px}\n.jeez-pl li{margin-bottom:7px}\n.jeez-pl ul li::marker{color:var(--jz-teal)}\n.jeez-pl .jz-callout{border-left:4px solid var(--jz-teal);background:var(--jz-teal-xlight);border-radius:0 var(--jz-radius) var(--jz-radius) 0;padding:16px 20px;margin:20px 0}\n.jeez-pl .jz-callout.blue{border-left-color:var(--jz-blue);background:var(--jz-blue-lite)}\n.jeez-pl .jz-callout.gold{border-left-color:var(--jz-gold);background:var(--jz-gold-lite)}\n.jeez-pl .jz-callout-tag{font-size:10px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--jz-teal);display:block;margin-bottom:6px}\n.jeez-pl .jz-callout.blue .jz-callout-tag{color:var(--jz-blue)}\n.jeez-pl .jz-callout.gold .jz-callout-tag{color:var(--jz-gold)}\n.jeez-pl .jz-table-wrap{overflow-x:auto;margin:22px 0;border-radius:var(--jz-radius);border:1px solid var(--jz-border);box-shadow:0 1px 4px rgba(0,0,0,.05)}\n.jeez-pl .jz-table-wrap table{width:100%;border-collapse:collapse;font-size:13px;line-height:1.5}\n.jeez-pl .jz-table-wrap thead th{background:var(--jz-navy);color:#fff;font-family:'Syne',sans-serif;font-weight:700;font-size:12px;padding:12px 15px;text-align:left;white-space:nowrap}\n.jeez-pl .jz-table-wrap thead th:first-child{border-radius:9px 0 0 0}\n.jeez-pl .jz-table-wrap thead th:last-child{border-radius:0 9px 0 0}\n.jeez-pl .jz-table-wrap tbody td{padding:10px 15px;border-bottom:1px solid var(--jz-border);vertical-align:top;color:var(--jz-text)}\n.jeez-pl .jz-table-wrap tbody tr:nth-child(even){background:var(--jz-bg)}\n.jeez-pl .jz-table-wrap tbody tr:hover{background:var(--jz-teal-xlight)}\n.jeez-pl .jz-table-wrap tbody tr:last-child td{border-bottom:none}\n.jeez-pl .jz-grid-2{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:20px 0}\n.jeez-pl .jz-card{border:1px solid var(--jz-border);border-top:3px solid var(--jz-teal);border-radius:var(--jz-radius);padding:20px;background:var(--jz-white)}\n.jeez-pl .jz-card h4{margin:0 0 8px;font-size:.92rem;color:var(--jz-navy)}\n.jeez-pl .jz-card p{margin:0;font-size:13.5px;color:var(--jz-muted);line-height:1.6}\n.jeez-pl .jz-more{display:inline-flex;align-items:center;gap:8px;background:var(--jz-teal-xlight);border:1px solid rgba(13,148,136,.22);border-radius:8px;padding:9px 17px;font-size:13px;font-weight:600;color:var(--jz-teal-dark);text-decoration:none;margin-top:12px;transition:background .15s}\n.jeez-pl .jz-more:hover{background:rgba(13,148,136,.14);color:var(--jz-teal-dark);text-decoration:none}\n.jeez-pl .jz-more-arrow{font-size:14px;flex-shrink:0}\n.jeez-pl .jz-cta-box{background:linear-gradient(140deg,#0B1D3A 0%,#0A3D62 100%);border-radius:16px;padding:44px 48px;text-align:center;margin:50px 0;position:relative;overflow:hidden}\n.jeez-pl .jz-cta-box::before{content:'';position:absolute;left:-70px;bottom:-70px;width:230px;height:230px;border-radius:50%;background:radial-gradient(circle,rgba(13,148,136,.16) 0%,transparent 70%)}\n.jeez-pl .jz-cta-box h3{font-family:'Syne',sans-serif;color:#fff;font-size:1.4rem;font-weight:800;margin:0 0 10px;position:relative}\n.jeez-pl .jz-cta-box p{color:rgba(255,255,255,.74);max-width:520px;margin:0 auto 26px;font-size:14.5px;position:relative}\n.jeez-pl .jz-btn{display:inline-block;background:var(--jz-teal);color:#fff;font-size:14.5px;font-weight:700;padding:13px 36px;border-radius:8px;text-decoration:none;transition:background .15s,transform .1s}\n.jeez-pl .jz-btn:hover{background:var(--jz-teal-dark);color:#fff;text-decoration:none;transform:translateY(-2px)}\n.jeez-pl .jz-faq-list{margin-top:18px}\n.jeez-pl .jz-faq-item{border:1px solid var(--jz-border);border-radius:var(--jz-radius);margin-bottom:12px;overflow:hidden}\n.jeez-pl .jz-faq-q{background:var(--jz-bg);padding:15px 20px;font-weight:600;font-size:14.5px;color:var(--jz-navy);border-left:4px solid var(--jz-teal);line-height:1.4}\n.jeez-pl .jz-faq-a{padding:14px 20px 16px;font-size:14px;color:var(--jz-text);line-height:1.74;border-top:1px solid var(--jz-border)}\n@media(max-width:680px){.jeez-pl .jz-hero{padding:28px 22px}.jeez-pl .jz-toc ol{columns:1}.jeez-pl .jz-grid-2{grid-template-columns:1fr}.jeez-pl .jz-cta-box{padding:32px 22px}.jeez-pl h2{font-size:1.3rem}}\n<\/style>\n\n<div class=\"jeez-pl\">\n\n<a class=\"jz-back-link\" href=\"https:\/\/jeez-semicon.com\/de\/blog\/Planarization-in-Semiconductor-Manufacturing-Complete-Guide\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u2190 Back to Complete Planarization Guide<\/a>\n\n<div class=\"jz-hero\">\n  <span class=\"jz-hero-eyebrow\">CMP Consumables \u2014 Slurry<\/span>\n  <p class=\"jz-hero-lead\">CMP slurry is the active medium through which both material removal and surface quality are determined in semiconductor planarization. This in-depth guide covers slurry composition, the chemistry of every major abrasive type, how each of the four primary slurry families works, slurry stability and handling requirements, and a practical selection framework for oxide, STI, tungsten, and copper CMP applications.<\/p>\n  <div class=\"jz-hero-meta\">\n    <span>Updated: <strong>June 2026<\/strong><\/span>\n    <span class=\"jz-pipe\">|<\/span>\n    <span>By <strong>JEEZ Technical Team<\/strong><\/span>\n  <\/div>\n<\/div>\n\n<nav class=\"jz-toc\" aria-label=\"Inhalts\u00fcbersicht\">\n  <span class=\"jz-toc-label\">Inhalts\u00fcbersicht<\/span>\n  <ol>\n    <li><a href=\"#what-is-slurry\">Was ist CMP-G\u00fclle?<\/a><\/li>\n    <li><a href=\"#abrasives\">Abrasive Particle Types In Depth<\/a><\/li>\n    <li><a href=\"#chemical-agents\">Chemical Agents: Oxidizers, Chelants &amp; Surfactants<\/a><\/li>\n    <li><a href=\"#oxide-slurry\">Oxide ILD CMP Slurry<\/a><\/li>\n    <li><a href=\"#sti-slurry\">STI CMP Slurry (Ceria Chemistry)<\/a><\/li>\n    <li><a href=\"#tungsten-slurry\">Tungsten CMP Slurry<\/a><\/li>\n    <li><a href=\"#copper-slurry\">Copper Damascene CMP Slurry<\/a><\/li>\n    <li><a href=\"#stability\">Slurry Stability, Storage &amp; Handling<\/a><\/li>\n    <li><a href=\"#selection\">Slurry Selection Guide<\/a><\/li>\n    <li><a href=\"#jeez-slurry\">JEEZ CMP Slurry Products<\/a><\/li>\n    <li><a href=\"#faq\">H\u00e4ufig gestellte Fragen<\/a><\/li>\n  <\/ol>\n<\/nav>\n\n\n<section id=\"what-is-slurry\">\n  <h2><span class=\"jz-sn\">01<\/span>Was ist CMP-G\u00fclle?<\/h2>\n  <p>CMP slurry is an engineered aqueous dispersion that serves simultaneously as the chemical reagent and the mechanical abrasive medium in a Chemical Mechanical Planarization process. It is the consumable that most directly determines the material removal rate (MRR), film selectivity, post-CMP surface roughness, and defect density of every CMP step. No other consumable has as large an influence on CMP process performance as the slurry.<\/p>\n  <p>A fully formulated CMP slurry typically contains four functional components working in concert:<\/p>\n  <ul>\n    <li><strong>Abrasive particles<\/strong> \u2014 nano-scale inorganic solids (20\u2013200 nm) that provide the mechanical cutting force at the pad\u2013wafer interface<\/li>\n    <li><strong>Chemical agents<\/strong> \u2014 oxidizers, chelating agents, corrosion inhibitors, and pH modifiers that react with the wafer surface to enhance material removal and control selectivity<\/li>\n    <li><strong>Stabilizers and dispersants<\/strong> \u2014 surfactants and polymeric additives that maintain colloidal stability and prevent particle agglomeration during storage and dispensing<\/li>\n    <li><strong>Aqueous carrier<\/strong> \u2014 ultra-pure deionized water (typically 18 M\u03a9\u00b7cm resistivity) as the solvent and transport medium for all other components<\/li>\n  <\/ul>\n\n  <div class=\"jz-callout gold\">\n    <span class=\"jz-callout-tag\">The Synergy Principle<\/span>\n    <p>Neither the chemical components nor the abrasive particles alone are sufficient for CMP. The chemical agents reduce the surface hardness of the target film through reaction, and the abrasive particles then efficiently remove this weakened surface layer. Together, they produce MRR values 10\u2013100\u00d7 higher than either mechanism alone \u2014 the fundamental reason why CMP is both fast and selective.<\/p>\n  <\/div>\n<\/section>\n\n\n<section id=\"abrasives\">\n  <h2><span class=\"jz-sn\">02<\/span>Abrasive Particle Types In Depth<\/h2>\n\n  <h3>Kolloidale Kiesels\u00e4ure (SiO\u2082)<\/h3>\n  <p>Colloidal silica is produced by the St\u00f6ber process \u2014 controlled hydrolysis and condensation of tetraethyl orthosilicate (TEOS) in an alcoholic ammonia solution \u2014 producing near-perfectly spherical SiO\u2082 particles with narrow, tunable size distributions (typically 30\u2013150 nm diameter). The spherical morphology and smooth surface texture are critical advantages: spherical particles produce minimal surface scratching compared to angular or irregular particles of the same size, enabling the sub-0.5 nm Ra values required for copper CMP buff and hybrid bonding surface preparation.<\/p>\n  <p>Colloidal silica is stable in aqueous dispersion at pH 8\u201311 (alkaline silica slurry) where the particle surfaces carry a high negative zeta potential (\u221240 to \u221260 mV), providing strong electrostatic repulsion that prevents agglomeration. Below pH 7, zeta potential decreases toward zero (the isoelectric point for SiO\u2082 is pH ~2), risking colloidal instability. This constrains oxide CMP with colloidal silica to alkaline pH operation.<\/p>\n  <p><strong>Applications:<\/strong> Oxide ILD CMP, silicon wafer final polishing (bare wafer CMP), copper CMP final buff step, polysilicon CMP.<\/p>\n\n  <h3>Fumed Ceria (CeO\u2082)<\/h3>\n  <p>Fumed ceria particles are produced by vapor-phase oxidation of cerium precursors, creating irregularly shaped primary particles (5\u201320 nm) that aggregate into larger secondary structures (50\u2013300 nm). The unique chemical activity of CeO\u2082 in oxide CMP stems from the Ce\u00b3\u207a\/Ce\u2074\u207a redox couple at the particle surface \u2014 a mechanism called the &#8220;chemical tooth&#8221; effect first described by Cook in 1990. CeO\u2082 surface sites react directly with Si\u2013O\u2013Si surface bonds of the oxide film, breaking them chemically and greatly accelerating material removal beyond what the mechanical abrasion alone would produce.<\/p>\n  <p>The most critical advantage of ceria is its outstanding oxide-to-nitride selectivity: because the chemical tooth mechanism is specific to oxide (Si\u2013O) bonds and does not efficiently attack Si\u2083N\u2084 surfaces, CeO\u2082 slurries can achieve SiO\u2082:Si\u2083N\u2084 removal rate ratios of 50:1 to &gt;200:1. This selectivity is essential for STI CMP, where the polishing must remove the oxide overburden but stop precisely on the silicon nitride hard mask without removing it.<\/p>\n  <p><strong>Applications:<\/strong> STI CMP (primary), ILD CMP where high oxide-to-nitride selectivity is needed, shallow trench etch stop.<\/p>\n\n  <h3>Fumed Alumina (Al\u2082O\u2083)<\/h3>\n  <p>Fumed alumina is produced by vapor-phase flame hydrolysis of AlCl\u2083, yielding aggregated primary particles (10\u201330 nm) with irregular, angular morphology and Mohs hardness of 9.0. This high hardness enables the aggressive material removal required for tungsten (W) CMP \u2014 tungsten is substantially harder than SiO\u2082, making the soft abrasion of colloidal silica insufficient for practical W removal rates. Alumina slurries in acidic pH (2\u20134) combined with H\u2082O\u2082 or KIO\u2083 oxidizers achieve W removal rates of 200\u2013600 nm\/min with good selectivity over the TiN\/TiW barrier layer and the underlying SiO\u2082.<\/p>\n  <p>The high hardness and angular morphology of alumina do carry a cost: alumina-based slurries produce higher surface scratch and defect densities than silica-based alternatives. Point-of-use filtration (typically 1\u20133 \u00b5m) and tightly controlled particle size distribution are essential quality controls for tungsten slurry.<\/p>\n  <p><strong>Applications:<\/strong> Tungsten (W) plug CMP, W hard mask CMP, polysilicon CMP.<\/p>\n<\/section>\n\n\n<section id=\"chemical-agents\">\n  <h2><span class=\"jz-sn\">03<\/span>Chemical Agents: Oxidizers, Chelants &amp; Surfactants<\/h2>\n\n  <h3>Oxidationsmittel<\/h3>\n  <p>Oxidizers are the chemical agents that react with the metal or film surface to create a softer, more easily abraded surface compound. Selection depends on the target metal and compatibility with the abrasive and stabilizer system:<\/p>\n  <ul>\n    <li><strong>H\u2082O\u2082 (hydrogen peroxide):<\/strong> The most widely used CMP oxidizer. For copper, H\u2082O\u2082 (0.5\u20135 wt%) oxidizes Cu\u2070 to Cu\u2082O and Cu(OH)\u2082 at the surface \u2014 compounds significantly softer than metallic copper. For tungsten, H\u2082O\u2082 oxidizes W to WO\u2083. Advantages: decomposes to water and oxygen (no metallic impurities); adjustable concentration. Disadvantage: unstable \u2014 decomposes over time, requiring point-of-use addition (two-part slurry mixing) for copper CMP applications.<\/li>\n    <li><strong>KIO\u2083 (potassium iodate):<\/strong> A stable, solid oxidizer for tungsten CMP. Does not decompose spontaneously, enabling longer slurry shelf life than H\u2082O\u2082-containing formulations. The iodate anion oxidizes W surface to WO\u2083 at low pH (2\u20133). Limitation: introduces potassium and iodide ions that require thorough post-CMP cleaning to prevent ionic contamination of the gate oxide.<\/li>\n    <li><strong>Oxone (KHSO\u2085):<\/strong> Used in specialty metal CMP applications including cobalt and ruthenium CMP at advanced nodes. Provides aggressive oxidation at neutral pH, enabling metal CMP without strong acid chemistry.<\/li>\n  <\/ul>\n\n  <h3>Chelating and Complexing Agents<\/h3>\n  <p>Chelating agents form stable soluble complexes with dissolved metal ions, preventing them from re-depositing onto the wafer surface as metallic or oxide particles. In copper CMP, glycine, citric acid, and ammonium citrate are common chelating agents that complex Cu\u00b2\u207a ions as they are released by oxidation and abrasion. Without chelation, dissolved copper would re-precipitate as CuO or Cu\u2082O particles on the wafer surface \u2014 a significant source of particle contamination and surface discoloration.<\/p>\n\n  <h3>Korrosionsinhibitoren<\/h3>\n  <p>Benzotriazole (BTA) is the most important corrosion inhibitor in copper CMP. BTA molecules adsorb strongly onto copper surfaces, forming a thin Cu\u2013BTA coordination complex that passivates the copper and reduces its dissolution rate. By selectively passivating flat, recessed copper areas (which experience lower contact pressure) while allowing the mechanical abrasion to remove the passivation from protruding features, BTA enables the slurry to achieve high pattern selectivity \u2014 high MRR over protruding copper and low MRR in recesses \u2014 which controls dishing in wide features. BTA concentration (typically 0.01\u20130.1 wt%) is one of the most sensitive process tuning parameters in copper CMP recipe development.<\/p>\n\n  <h3>Surfactants and pH Buffers<\/h3>\n  <p>Non-ionic and anionic surfactants (polyethylene glycol derivatives, ammonium lauryl sulfate) control particle dispersion stability by providing steric and electrostatic repulsion between abrasive particles. They also modify the wetting behavior of the slurry on the pad surface, influencing how uniformly the slurry is distributed across the polishing interface. pH buffers (ammonium hydroxide, KOH, HNO\u2083, citric acid) maintain the required pH window that controls both colloidal particle stability and the rate of chemical reaction with the film surface.<\/p>\n<\/section>\n\n\n<section id=\"oxide-slurry\">\n  <h2><span class=\"jz-sn\">04<\/span>Oxide ILD CMP Slurry<\/h2>\n  <p>Oxide ILD CMP is the most common and highest-volume CMP application in any semiconductor fab. The target films are thermally grown or CVD-deposited SiO\u2082, TEOS oxide, fluorinated silicate glass (FSG, k ~ 3.5\u20133.7), or low-k SiCOH (k ~ 2.7\u20133.0). The objective is to remove a controlled thickness of oxide to planarize the ILD surface after metal line patterning, achieving a WIWNU specification typically below 2%.<\/p>\n  <p>Standard oxide CMP slurries use colloidal silica (30\u2013100 nm, 10\u201330 wt% solids content) dispersed in alkaline aqueous solution (pH 10\u201311, buffered with KOH or NH\u2084OH). The alkaline pH serves two purposes: it maintains colloidal stability of the silica particles (high zeta potential) and it accelerates the chemical step in oxide removal by breaking Si\u2013O surface bonds. MRR is typically 150\u2013400 nm\/min. Selectivity to silicon nitride is moderate (3:1 to 10:1), meaning Si\u2083N\u2084 stop layers must be thick enough to absorb this over-polishing without being fully consumed.<\/p>\n  <p>For low-k dielectric CMP (porous SiCOH, k &lt; 2.5), slurry formulation must account for the mechanical fragility of porous dielectric \u2014 reduced silica particle size (20\u201340 nm), lower abrasive concentration, reduced down-force, and higher surfactant content to reduce the risk of dielectric delamination or mechanical damage to the open pore structure.<\/p>\n<\/section>\n\n\n<section id=\"sti-slurry\">\n  <h2><span class=\"jz-sn\">05<\/span>STI CMP Slurry: Ceria Chemistry and High Selectivity<\/h2>\n  <p>Shallow Trench Isolation (STI) CMP requires a slurry that can remove a large amount of HDP-CVD oxide (typically 300\u2013600 nm overburden) while stopping precisely on the underlying Si\u2083N\u2084 hard mask (typically 100\u2013200 nm thick). The required SiO\u2082:Si\u2083N\u2084 selectivity of 50:1 to &gt;100:1 far exceeds what conventional silica-based slurries can achieve, making ceria (CeO\u2082) the standard abrasive for STI CMP.<\/p>\n\n  <h3>Ceria Slurry Chemistry and Selectivity Mechanism<\/h3>\n  <p>The high oxide-to-nitride selectivity of ceria slurries arises from two complementary mechanisms:<\/p>\n  <ol>\n    <li><strong>Chemical tooth selectivity:<\/strong> Ce\u00b3\u207a surface sites on the ceria particle react specifically with Si\u2013O\u2013Si surface bonds of SiO\u2082 through a Ce\u2013O\u2013Si surface complex, dramatically accelerating oxide removal. Si\u2083N\u2084 surfaces, which present Si\u2013N bonds rather than Si\u2013O bonds, do not form this complex efficiently, limiting ceria&#8217;s chemical interaction with nitride and producing the inherently high selectivity.<\/li>\n    <li><strong>Passivation additive selectivity:<\/strong> Many commercial STI slurries contain polymeric additives (e.g., polyacrylic acid, PAA) that preferentially adsorb onto Si\u2083N\u2084 surfaces, forming a passivation layer that further suppresses nitride removal and dramatically increases the achievable selectivity to &gt;100:1 in some formulations.<\/li>\n  <\/ol>\n\n  <p>STI slurries operate at near-neutral to mildly acidic pH (pH 4\u20137), where ceria particles are positively charged (isoelectric point of CeO\u2082 ~ pH 6\u20137). Careful pH control is critical \u2014 small pH variations can shift the zeta potential of ceria particles, affecting colloidal stability and changing the selectivity ratio through altered surface adsorption behavior.<\/p>\n\n  <div class=\"jz-callout\">\n    <span class=\"jz-callout-tag\">Key Parameter<\/span>\n    <p>STI CMP oxide-to-nitride selectivity directly controls the remaining nitride thickness after polish \u2014 a critical process metric because the nitride serves as the STI pull-back etch mask in subsequent processing. A slurry with selectivity of 100:1 removes only 1 nm of nitride for every 100 nm of oxide removed, enabling tight control of remaining nitride thickness across the wafer.<\/p>\n  <\/div>\n<\/section>\n\n\n<section id=\"tungsten-slurry\">\n  <h2><span class=\"jz-sn\">06<\/span>Tungsten CMP Slurry<\/h2>\n  <p>Tungsten (W) contact plug CMP removes the CVD-W overburden deposited above contact holes during the TEOS\/Ti\/TiN\/W contact plug formation module. The target film system is W (200\u2013400 nm overburden) on TiN\/TiW (5\u201320 nm) barrier on SiO\u2082 (ILD). The CMP must efficiently remove the W overburden and TiN\/TiW barrier while stopping on the SiO\u2082 ILD without significant dishing of the W plugs or erosion of the surrounding oxide.<\/p>\n\n  <h3>Slurry Composition<\/h3>\n  <p>Standard tungsten CMP slurries use fumed alumina (Al\u2082O\u2083, 0.5\u20133 wt%) in acidic aqueous solution (pH 2\u20134) with H\u2082O\u2082 (0.5\u20135 wt%) or KIO\u2083 (1\u20135 wt%) as oxidizer. The mechanism is: H\u2082O\u2082 oxidizes the W surface to brittle, easily-abraded WO\u2083; Al\u2082O\u2083 particles mechanically remove the WO\u2083 layer; fresh metallic W is exposed and immediately re-oxidized; the cycle repeats. W CMP MRR is typically 200\u2013500 nm\/min.<\/p>\n\n  <h3>Selectivity Considerations<\/h3>\n  <p>W:SiO\u2082 removal selectivity is typically 5:1 to 15:1 \u2014 moderate selectivity that must be managed carefully to avoid excessive SiO\u2082 erosion around dense plug arrays. TiN\/TiW barrier removal is faster than SiO\u2082 and slower than W in most formulations, enabling a &#8220;barrier clearing&#8221; polishing step that removes all TiN residue while minimizing SiO\u2082 loss. Key defect concern: alumina particles agglomerate more readily than colloidal silica, making point-of-use filtration and slurry freshness management critical quality controls.<\/p>\n<\/section>\n\n\n<section id=\"copper-slurry\">\n  <h2><span class=\"jz-sn\">07<\/span>Copper Damascene CMP Slurry<\/h2>\n  <p>Copper CMP for dual-damascene interconnects is the most complex CMP application from a chemistry design perspective, requiring slurries that balance multiple competing requirements: high copper removal rate (bulk step), controlled selectivity between Cu, TaN\/Ta barrier, and SiO\u2082 or low-k dielectric, minimum dishing of wide copper features, and sub-0.5 nm Ra surface finish after polishing.<\/p>\n\n  <h3>Two-Step Copper CMP Process Chemistry<\/h3>\n  <p>Copper CMP typically uses two distinct slurry formulations in a sequential process:<\/p>\n\n  <h4>Step 1 \u2014 Bulk Copper Removal<\/h4>\n  <p>Colloidal silica (30\u201360 nm, 5\u201315 wt%) in aqueous solution at pH 4\u20136, with H\u2082O\u2082 (1\u20135 wt%, added at point-of-use) as oxidizer and glycine or alanine (0.1\u20131 wt%) as chelating agent. The goal is high-rate Cu removal (300\u2013600 nm\/min) with good selectivity to barrier metal (Cu:TaN selectivity typically 5:1 to 20:1), stopping when the Cu overburden is nearly cleared and the barrier is about to be exposed. BTA (0.001\u20130.05 wt%) may be included at low concentration to suppress dishing in wide Cu features during the final stage of Step 1.<\/p>\n\n  <h4>Step 2 \u2014 Barrier Clearing and Final Planarization<\/h4>\n  <p>A barrier-clearing slurry removes the exposed TaN\/Ta diffusion barrier while planarizing the remaining Cu and the surrounding dielectric simultaneously. Higher BTA concentration (0.01\u20130.1 wt%) suppresses copper dissolution during this step. Barrier slurries for traditional Cu-SiO\u2082 systems typically use H\u2082O\u2082 oxidizer with citrate or malonate chelation at pH 5\u20137. For low-k dielectric systems (k &lt; 2.5), barrier slurries must use reduced mechanical force and non-corrosive chemistry to avoid delamination or mechanically damaging the fragile porous dielectric.<\/p>\n\n  <a class=\"jz-more\" href=\"https:\/\/jeez-semicon.com\/de\/blog\/CMP-Polishing-Pads-Types-Structure-Role-in-Wafer-Planarization\/\" target=\"_blank\" rel=\"noopener noreferrer\">\n    <span>Related: CMP Polishing Pads \u2014 Types, Structure &amp; Role in Wafer Planarization<\/span>\n    <span class=\"jz-more-arrow\">\u2192<\/span>\n  <\/a>\n<\/section>\n\n\n<section id=\"stability\">\n  <h2><span class=\"jz-sn\">08<\/span>Slurry Stability, Storage &amp; Handling<\/h2>\n  <p>CMP slurry is a thermodynamically metastable colloidal dispersion \u2014 given enough time, temperature excursions, or mechanical stress, abrasive particles will aggregate (agglomerate) into larger clusters. Agglomerated particles are the leading cause of CMP surface scratches, a yield-critical defect. Slurry stability management is therefore a mandatory discipline in any CMP operation.<\/p>\n\n  <div class=\"jz-grid-2\">\n    <div class=\"jz-card\">\n      <h4>Storage Temperature Control<\/h4>\n      <p>Most CMP slurries must be stored at 15\u201325\u00b0C. Below 5\u00b0C, colloidal particles can undergo irreversible agglomeration due to reduced electrostatic repulsion and potential freezing of the aqueous carrier. Above 30\u00b0C, increased thermal energy accelerates particle collision frequency and promotes agglomeration. Temperature-controlled storage rooms or cabinets are standard in high-volume fabs. Slurry must never be frozen.<\/p>\n    <\/div>\n    <div class=\"jz-card\">\n      <h4>Shelf Life and Expiry Management<\/h4>\n      <p>CMP slurries have defined shelf lives ranging from 3 to 24 months, depending on abrasive type, pH, oxidizer presence, and concentration. H\u2082O\u2082-containing slurries have the shortest stability windows (often 6\u201312 months from manufacture) due to slow H\u2082O\u2082 decomposition. First-in, first-out (FIFO) inventory rotation and lot expiry date tracking are essential operational disciplines. Using expired slurry risks elevated particle counts and degraded CMP performance.<\/p>\n    <\/div>\n    <div class=\"jz-card\">\n      <h4>Point-of-Use Filtration<\/h4>\n      <p>In-line filters (0.2\u20133 \u00b5m, polypropylene or PTFE membrane) installed in the slurry supply line between the bulk storage tank and the CMP tool dispense nozzle remove agglomerated particles before they reach the wafer surface. Filter element replacement frequency is determined by monitoring the differential pressure across the filter \u2014 a rise in \u0394P indicates particle loading and signals time for replacement. Some fabs use in-line dynamic light scattering (DLS) sensors for real-time particle size monitoring.<\/p>\n    <\/div>\n    <div class=\"jz-card\">\n      <h4>Mixing and Agitation<\/h4>\n      <p>Slurry storage tanks are maintained under gentle, continuous agitation (recirculation pump at low flow rate, or paddle mixing at 5\u201320 rpm) to prevent particle sedimentation \u2014 particularly important for denser abrasives like ceria and alumina, which have higher settling rates than colloidal silica. Re-circulation loop design (no dead-legs, smooth bends, no high-shear pump designs) prevents shear-induced agglomeration during circulation.<\/p>\n    <\/div>\n  <\/div>\n<\/section>\n\n\n<section id=\"selection\">\n  <h2><span class=\"jz-sn\">09<\/span>Slurry Selection Guide<\/h2>\n\n  <div class=\"jz-table-wrap\">\n    <table>\n      <thead>\n        <tr><th>CMP Application<\/th><th>Recommended Abrasive<\/th><th>pH-Bereich<\/th><th>Key Oxidizer<\/th><th>Primary Selection Criteria<\/th><\/tr>\n      <\/thead>\n      <tbody>\n        <tr><td><strong>Oxide ILD CMP<\/strong><\/td><td>Colloidal SiO\u2082 (50\u2013100 nm)<\/td><td>10\u201311<\/td><td>None (pH drives chemistry)<\/td><td>MRR (200\u2013400 nm\/min), WIWNU, low scratch rate<\/td><\/tr>\n        <tr><td><strong>STI CMP<\/strong><\/td><td>Fumed CeO\u2082 (50\u2013200 nm)<\/td><td>4-7<\/td><td>None (chemical tooth mechanism)<\/td><td>Oxide:nitride selectivity (&gt;50:1), WIWNU, dishing<\/td><\/tr>\n        <tr><td><strong>Wolfram CMP<\/strong><\/td><td>Fumed Al\u2082O\u2083 (50\u2013150 nm)<\/td><td>2-4<\/td><td>H\u2082O\u2082 or KIO\u2083<\/td><td>W:SiO\u2082 selectivity, plug dishing, scratch density<\/td><\/tr>\n        <tr><td><strong>Cu CMP (Step 1)<\/strong><\/td><td>Colloidal SiO\u2082 (30\u201360 nm)<\/td><td>4-6<\/td><td>H\u2082O\u2082 (point-of-use)<\/td><td>Cu MRR, Cu:barrier selectivity, dishing control<\/td><\/tr>\n        <tr><td><strong>Cu CMP (Step 2 barrier)<\/strong><\/td><td>Colloidal SiO\u2082 (20\u201340 nm)<\/td><td>5-7<\/td><td>H\u2082O\u2082 (low concentration)<\/td><td>Barrier clearance, low Cu dishing, low-k compatibility<\/td><\/tr>\n        <tr><td><strong>Polysilicon CMP<\/strong><\/td><td>Colloidal SiO\u2082 or Al\u2082O\u2083<\/td><td>10\u201312<\/td><td>None or KOH<\/td><td>Poly:oxide selectivity, gate height uniformity<\/td><\/tr>\n        <tr><td><strong>SiC CMP<\/strong><\/td><td>Colloidal SiO\u2082 + Fenton reagent<\/td><td>3\u20135<\/td><td>H\u2082O\u2082\/Fe\u00b2\u207a (Fenton)<\/td><td>MRR (SiC hardness challenge), Ra &lt;0.2 nm<\/td><\/tr>\n      <\/tbody>\n    <\/table>\n  <\/div>\n<\/section>\n\n\n<section id=\"jeez-slurry\">\n  <h2><span class=\"jz-sn\">10<\/span>JEEZ CMP Slurry Products<\/h2>\n  <p>JEEZ (Jizhi Electronic Technology Co., Ltd.) manufactures a comprehensive portfolio of CMP polishing slurries for semiconductor planarization applications. As a direct manufacturer \u2014 not a distributor \u2014 JEEZ maintains full control over abrasive synthesis, slurry formulation, quality testing, and technical support.<\/p>\n  <p>The JEEZ CMP slurry lineup covers oxide ILD, STI (high-selectivity ceria-based), tungsten plug, and copper damascene applications. Each product line is engineered for: tight particle size distribution control (D99 &lt; 200 nm), long-term dispersion stability, application-specific selectivity and MRR targets, and compatibility with standard slurry delivery and filtration infrastructure. JEEZ application engineers work directly with customers to match slurry specifications to specific tool platforms, process integration requirements, and downstream metrology targets.<\/p>\n  <p>All JEEZ slurry products are manufactured under ISO-certified quality systems and are available for global supply to logic, memory, power device, and compound semiconductor manufacturing facilities.<\/p>\n<\/section>\n\n\n<div class=\"jz-cta-box\">\n  <h3>Request CMP Slurry Datasheets or Technical Consultation<\/h3>\n  <p>Contact JEEZ to request product datasheets, discuss slurry qualification for your specific CMP module, or arrange a technical consultation with our application engineering team.<\/p>\n  <a class=\"jz-btn\" href=\"https:\/\/jeez-semicon.com\/de\/contact\/\" target=\"_blank\" rel=\"noopener noreferrer\">Contact JEEZ Technical Team \u2192<\/a>\n<\/div>\n\n\n<section id=\"faq\">\n  <h2><span class=\"jz-sn\">FAQ<\/span>H\u00e4ufig gestellte Fragen<\/h2>\n  <div class=\"jz-faq-list\">\n    <div class=\"jz-faq-item\">\n      <div class=\"jz-faq-q\">What abrasive is used in CMP slurry for oxide planarization?<\/div>\n      <div class=\"jz-faq-a\">Colloidal silica (SiO\u2082) is the standard abrasive for oxide ILD CMP. Produced by the St\u00f6ber sol-gel process, colloidal silica particles are spherical (30\u2013150 nm diameter), narrow size distribution, and stable at alkaline pH (10\u201311). They provide MRR of 200\u2013400 nm\/min on TEOS SiO\u2082 with surface roughness Ra below 0.5 nm. For STI CMP requiring high oxide-to-nitride selectivity (&gt;50:1), fumed ceria (CeO\u2082) replaces silica as the preferred abrasive.<\/div>\n    <\/div>\n    <div class=\"jz-faq-item\">\n      <div class=\"jz-faq-q\">Why does copper CMP slurry need H\u2082O\u2082 added at point-of-use?<\/div>\n      <div class=\"jz-faq-a\">H\u2082O\u2082 (hydrogen peroxide) is chemically unstable and decomposes over time, accelerated by metal ion contamination, elevated temperature, and light exposure. If H\u2082O\u2082 is mixed with the copper slurry at the bulk storage stage, it will decompose before the slurry is used, reducing oxidizer concentration and unpredictably changing MRR. Point-of-use addition \u2014 mixing H\u2082O\u2082 with the base slurry just before it reaches the CMP tool dispense nozzle \u2014 ensures consistent, fresh oxidizer concentration at every wafer polishing step.<\/div>\n    <\/div>\n    <div class=\"jz-faq-item\">\n      <div class=\"jz-faq-q\">What is the role of benzotriazole (BTA) in copper CMP slurry?<\/div>\n      <div class=\"jz-faq-a\">BTA is a corrosion inhibitor that adsorbs onto copper surfaces, forming a thin Cu\u2013BTA coordination complex that passivates the copper and reduces its dissolution rate. In copper CMP, BTA selectively passivates recessed copper areas (which experience lower mechanical contact pressure from the pad) while the mechanical action of the pad removes the BTA passivation layer from protruding features that experience higher contact pressure. This differential passivation\/removal mechanism allows the slurry to achieve high selectivity between protruding and recessed copper \u2014 controlling dishing in wide copper features. BTA concentration (0.01\u20130.1 wt%) is one of the most sensitive process tuning parameters in copper CMP recipe development.<\/div>\n    <\/div>\n    <div class=\"jz-faq-item\">\n      <div class=\"jz-faq-q\">How should CMP slurry be stored to prevent agglomeration?<\/div>\n      <div class=\"jz-faq-a\">CMP slurry should be stored at 15\u201325\u00b0C in a temperature-controlled environment, away from direct sunlight and freezing conditions. Storage tanks should maintain gentle continuous agitation (recirculation or low-speed mixing) to prevent particle sedimentation. FIFO (first-in, first-out) inventory rotation and strict lot expiry date tracking are mandatory. In-line point-of-use filtration (0.2\u20133 \u00b5m) should be maintained between the storage system and the CMP tool dispense line. H\u2082O\u2082-containing slurries should be mixed at point-of-use, not stored pre-mixed.<\/div>\n    <\/div>\n    <div class=\"jz-faq-item\">\n      <div class=\"jz-faq-q\">What is oxide-to-nitride selectivity and why is it important in STI CMP?<\/div>\n      <div class=\"jz-faq-a\">Oxide-to-nitride selectivity is the ratio of the SiO\u2082 removal rate to the Si\u2083N\u2084 removal rate under identical CMP conditions. In STI CMP, the silicon nitride layer serves as the polish stop \u2014 the layer at which polishing should cease, leaving the nitride intact to define the final oxide height in the trench. A selectivity of 100:1 means that for every 100 nm of oxide removed, only 1 nm of nitride is consumed \u2014 allowing tight control of post-CMP nitride thickness even with process variation. Insufficient selectivity (&lt;20:1) would consume the nitride stop layer during oxide overburden clearing, causing over-polish into the silicon below and degrading transistor performance uniformity.<\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n<\/div>\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\"@type\":\"Question\",\"name\":\"What abrasive is used in CMP slurry for oxide planarization?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Colloidal silica (SiO2, 30\u2013150 nm) is standard for oxide ILD CMP, used at pH 10\u201311, achieving MRR 200\u2013400 nm\/min with Ra below 0.5 nm. For STI CMP requiring high oxide-to-nitride selectivity (>50:1), fumed ceria (CeO2) is the preferred abrasive.\"}},\n    {\"@type\":\"Question\",\"name\":\"Why does copper CMP slurry need H2O2 added at point-of-use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"H2O2 decomposes over time due to contamination, temperature, and light exposure. Point-of-use addition \u2014 mixing H2O2 with the base slurry just before the CMP tool dispense nozzle \u2014 ensures consistent, fresh oxidizer concentration at every wafer polishing step.\"}},\n    {\"@type\":\"Question\",\"name\":\"What is the role of benzotriazole (BTA) in copper CMP slurry?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"BTA passivates copper surfaces, selectively protecting recessed areas (lower contact pressure) while mechanical action removes the passivation from protruding features (higher contact pressure). This controls dishing in wide copper features. BTA concentration (0.01\u20130.1 wt%) is a critical process tuning parameter.\"}},\n    {\"@type\":\"Question\",\"name\":\"What is oxide-to-nitride selectivity and why is it important in STI CMP?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Oxide-to-nitride selectivity is the SiO2:Si3N4 removal rate ratio. In STI CMP, Si3N4 is the polish stop layer. High selectivity (e.g., 100:1) ensures only 1 nm of nitride is consumed per 100 nm of oxide removed, enabling precise post-CMP nitride thickness control \u2014 critical for transistor isolation uniformity.\"}}\n  ]\n}\n<\/script>","protected":false},"excerpt":{"rendered":"<p>\u2190 Back to Complete Planarization Guide CMP Consumables \u2014 Slurry CMP slurry is the active medium through which both material removal and surface quality are determined in semiconductor planarization. This  &#8230;<\/p>","protected":false},"author":1,"featured_media":2384,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[9,59],"tags":[],"class_list":["post-2382","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-industry"],"acf":[],"_links":{"self":[{"href":"https:\/\/jeez-semicon.com\/de\/wp-json\/wp\/v2\/posts\/2382","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jeez-semicon.com\/de\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jeez-semicon.com\/de\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jeez-semicon.com\/de\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jeez-semicon.com\/de\/wp-json\/wp\/v2\/comments?post=2382"}],"version-history":[{"count":2,"href":"https:\/\/jeez-semicon.com\/de\/wp-json\/wp\/v2\/posts\/2382\/revisions"}],"predecessor-version":[{"id":2385,"href":"https:\/\/jeez-semicon.com\/de\/wp-json\/wp\/v2\/posts\/2382\/revisions\/2385"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/jeez-semicon.com\/de\/wp-json\/wp\/v2\/media\/2384"}],"wp:attachment":[{"href":"https:\/\/jeez-semicon.com\/de\/wp-json\/wp\/v2\/media?parent=2382"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jeez-semicon.com\/de\/wp-json\/wp\/v2\/categories?post=2382"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jeez-semicon.com\/de\/wp-json\/wp\/v2\/tags?post=2382"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}