{"id":2423,"date":"2026-06-30T16:45:43","date_gmt":"2026-06-30T08:45:43","guid":{"rendered":"https:\/\/jeez-semicon.com\/?p=2423"},"modified":"2026-06-30T16:45:43","modified_gmt":"2026-06-30T08:45:43","slug":"cmp-machine-applications-sti-copper-interconnect-w-cmp-advanced-node-processing","status":"publish","type":"post","link":"https:\/\/jeez-semicon.com\/zh\/blog\/cmp-machine-applications-sti-copper-interconnect-w-cmp-advanced-node-processing\/","title":{"rendered":"CMP Machine Applications: STI, Copper Interconnect, W-CMP &amp; Advanced Node Processing"},"content":{"rendered":"<link href=\"https:\/\/fonts.googleapis.com\/css2?family=Syne:wght@600;700&amp;family=Inter:ital,wght@0,400;0,500;0,600;1,400&amp;display=swap\" rel=\"stylesheet\">\n\n<style>\n.jcmp-art {\n  --jc-navy:        #0A2547;\n  --jc-blue:        #1B6FC8;\n  --jc-blue-hover:  #1459A8;\n  --jc-blue-light:  #EEF4FF;\n  --jc-blue-border: #C5D9F6;\n  --jc-text:        #1A1F2E;\n  --jc-text-2:      #4B5563;\n  --jc-text-3:      #9CA3AF;\n  --jc-border:      #E5E7EB;\n  --jc-bg:          #F8FAFF;\n  --jc-white:       #FFFFFF;\n  --jc-green:       #059669;\n  font-family: 'Inter', system-ui, -apple-system, sans-serif;\n  color: var(--jc-text);\n  line-height: 1.8;\n  font-size: 16px;\n  max-width: 860px;\n  margin: 0 auto;\n}\n.jcmp-art *, .jcmp-art *::before, .jcmp-art *::after { box-sizing: border-box; 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}\n  .jcmp-grid { grid-template-columns: 1fr; }\n  .jcmp-toc ol { column-count: 1; }\n  .jcmp-art h1 { font-size: 1.8rem; }\n  .jcmp-art h2 { font-size: 1.35rem; }\n  .jcmp-cta { padding: 1.5rem; }\n  .jcmp-cta-mid { flex-direction: column; align-items: flex-start; }\n}\n<\/style>\n\n<div class=\"jcmp-art\" itemscope=\"\" itemtype=\"https:\/\/schema.org\/Article\">\n\n  <div class=\"jcmp-meta\">\n    <span>Last updated: July 2026<\/span>\n    <span class=\"jcmp-meta-dot\"><\/span>\n    <span>15 \u5206\u949f\u9605\u8bfb<\/span>\n    <span class=\"jcmp-meta-dot\"><\/span>\n    <span>JEEZ Technical Editorial Team \u2014 Jizhi Electronic Technology Co., Ltd.<\/span>\n  <\/div>\n\n\n  <p class=\"jcmp-lead\">\n    CMP machines are deployed across the full breadth of semiconductor device fabrication, from the earliest front-end transistor formation steps through the dozens of back-end-of-line interconnect layers, and increasingly into advanced packaging and 3D integration. Each application imposes a distinct set of removal rate, selectivity, and defectivity requirements that determine which slurry chemistry, abrasive system, and pad configuration are appropriate. This guide details every major CMP application in the modern fab flow as of July 2026.\n  <\/p>\n\n  <div class=\"jcmp-stats\">\n    <div class=\"jcmp-stat\">\n      <div class=\"jcmp-stat-num\">15-25<\/div>\n      <div class=\"jcmp-stat-label\">CMP steps in a typical advanced-node logic chip flow<\/div>\n    <\/div>\n    <div class=\"jcmp-stat\">\n      <div class=\"jcmp-stat-num\">100:1<\/div>\n      <div class=\"jcmp-stat-label\">Typical oxide-to-nitride selectivity target for STI CMP<\/div>\n    <\/div>\n    <div class=\"jcmp-stat\">\n      <div class=\"jcmp-stat-num\">3<\/div>\n      <div class=\"jcmp-stat-label\">Sequential polish steps in a standard copper damascene CMP flow<\/div>\n    <\/div>\n    <div class=\"jcmp-stat\">\n      <div class=\"jcmp-stat-num\">8+<\/div>\n      <div class=\"jcmp-stat-label\">Distinct CMP application categories across the modern fab flow<\/div>\n    <\/div>\n  <\/div>\n\n  <nav class=\"jcmp-toc\" aria-label=\"\u76ee\u5f55\">\n    <div class=\"jcmp-toc-title\">\u76ee\u5f55<\/div>\n    <ol>\n      <li><a href=\"#oxide-cmp\">Oxide ILD CMP<\/a><\/li>\n      <li><a href=\"#sti-cmp\">Shallow Trench Isolation (STI) CMP<\/a><\/li>\n      <li><a href=\"#tungsten-cmp\">Tungsten CMP (W-CMP)<\/a><\/li>\n      <li><a href=\"#copper-cmp\">Copper CMP (Damascene Process)<\/a><\/li>\n      <li><a href=\"#hkmg-cmp\">High-k \/ Metal Gate (HKMG) CMP<\/a><\/li>\n      <li><a href=\"#3dic-cmp\">3D IC, TSV &amp; Advanced Packaging CMP<\/a><\/li>\n      <li><a href=\"#compound-cmp\">Compound Semiconductor &amp; Power Device CMP<\/a><\/li>\n      <li><a href=\"#comparison\">Application Comparison Table<\/a><\/li>\n      <li><a href=\"#faq\">\u5e38\u89c1\u95ee\u9898<\/a><\/li>\n    <\/ol>\n  <\/nav>\n\n  <p>This article is part of the JEEZ CMP knowledge base. For the complete equipment overview, return to: <a href=\"https:\/\/jeez-semicon.com\/zh\/blog\/CMP-Machines-The-Complete-Guide-to-Chemical-Mechanical-Planarization-Equipment\/\" target=\"_blank\" rel=\"noopener noreferrer\">CMP Machines: The Complete Guide to Chemical Mechanical Planarization Equipment<\/a>.<\/p>\n\n  <div style=\"margin-bottom:1rem;\">\n    <span class=\"jcmp-tag\">Oxide ILD<\/span>\n    <span class=\"jcmp-tag\">STI<\/span>\n    <span class=\"jcmp-tag\">\u94a8<\/span>\n    <span class=\"jcmp-tag\">Copper Damascene<\/span>\n    <span class=\"jcmp-tag\">HKMG<\/span>\n    <span class=\"jcmp-tag\">3D IC \/ TSV<\/span>\n    <span class=\"jcmp-tag\">\u78b3\u5316\u7845\/\u6c2e\u5316\u9553<\/span>\n    <span class=\"jcmp-tag\">Advanced Packaging<\/span>\n  <\/div>\n\n  <section id=\"oxide-cmp\">\n    <h2>Oxide ILD CMP (Inter-Level Dielectric Planarization)<\/h2>\n\n    <p>Oxide CMP is the original semiconductor CMP application and remains one of the most frequently executed CMP steps across the modern fab flow. After silicon dioxide (SiO<sub>2<\/sub>) is deposited as an inter-level dielectric (ILD) separating successive metal interconnect layers, the deposited film inherits significant surface topography from the metal features beneath it. CMP removes this excess oxide and restores a globally flat surface, establishing the planarity baseline required for accurate lithographic patterning of the next layer.<\/p>\n\n    <p>Oxide CMP typically employs silica-based slurries at moderately high pH (10\u201311), where hydroxide-mediated hydrolysis of strained Si-O-Si surface bonds drives the chemical softening mechanism. Removal rates for oxide ILD CMP are among the highest in the standard process flow \u2014 typically 1,500 to 3,500 \u00c5\/min \u2014 reflecting its role as a relatively high-throughput, comparatively forgiving planarization step. Because of this relative tolerance, oxide CMP is also the most common process used by fabs and consumable suppliers when initially evaluating new pad or slurry formulations before qualifying them for more demanding applications.<\/p>\n  <\/section>\n\n  <hr class=\"jcmp-hr\">\n\n  <section id=\"sti-cmp\">\n    <h2>Shallow Trench Isolation (STI) CMP<\/h2>\n\n    <p>STI CMP is a front-end-of-line process that defines the electrically isolated active regions where individual transistors will be formed. After etching shallow trenches into the silicon substrate and filling them with deposited oxide, the wafer surface carries oxide overburden across both the trench regions and the silicon nitride (Si<sub>3<\/sub>N<sub>4<\/sub>) hard mask covering the active areas. CMP removes this oxide overburden, stopping precisely at the nitride layer to leave isolation oxide only within the trenches.<\/p>\n\n    <p>The defining technical challenge of STI CMP is achieving extremely high oxide-to-nitride removal selectivity \u2014 commonly exceeding 100:1 \u2014 to ensure the process stops cleanly at the nitride polish-stop layer without eroding the active area definition. This selectivity requirement is met through <strong>ceria (CeO<sub>2<\/sub>)-based slurries<\/strong>, whose unique surface chemistry forms strong, selective chemical bonds with silicon dioxide through a ligand-exchange mechanism that is far less active against silicon nitride \u2014 a selectivity behavior that silica-based abrasive systems cannot replicate regardless of mechanical parameter adjustment. STI CMP also requires careful attention to dishing within wide trench regions and erosion of the nitride layer over densely patterned regions, both of which are actively managed through slurry formulation and process parameter optimization.<\/p>\n  <\/section>\n\n  <hr class=\"jcmp-hr\">\n\n  <section id=\"tungsten-cmp\">\n    <h2>Tungsten CMP (W-CMP)<\/h2>\n\n    <p>Tungsten CMP forms the contact plugs connecting transistor source, drain, and gate terminals to the first metal interconnect layer, as well as via fills between successive tungsten interconnect levels in certain process architectures. After chemical vapor deposition (CVD) blanket-deposits tungsten to overfill the etched contact and via openings, CMP removes the tungsten overburden back to the surrounding dielectric surface, leaving isolated tungsten plugs within each contact opening.<\/p>\n\n    <p>W-CMP is mechanically one of the most demanding standard CMP applications, requiring relatively high applied pressure and aggressive abrasive content to achieve economically viable removal rates against tungsten&#8217;s high hardness and chemical inertness. Slurry chemistry typically relies on strong oxidizers \u2014 potassium iodate (KIO<sub>3<\/sub>), hydrogen peroxide, or ferric nitrate-based systems \u2014 combined with alumina or silica abrasive particles. Primary yield risks in W-CMP include tungsten plug dishing (excessive recess of the plug surface relative to the surrounding dielectric) and tungsten residue defects from incomplete clearing in densely patterned regions, both of which require careful slurry selectivity and process endpoint control to manage.<\/p>\n  <\/section>\n\n  <hr class=\"jcmp-hr\">\n\n  <section id=\"copper-cmp\">\n    <h2>Copper CMP (Damascene Process)<\/h2>\n\n    <p>Copper CMP is the most process-complex CMP application in standard high-volume manufacturing and is universally required to form the multi-layer copper interconnect network in the dual-damascene back-end-of-line process. Because copper cannot be effectively dry-etched at production scale, the entire copper interconnect structure relies on a &#8220;subtractive via CMP&#8221; approach: copper is deposited to overfill trenches and vias etched into the dielectric, and CMP then removes the excess copper, leaving the metal pattern embedded within \u2014 rather than on top of \u2014 the dielectric.<\/p>\n\n    <p>A standard copper damascene CMP sequence comprises three distinct polishing steps, each requiring a different consumable configuration:<\/p>\n\n    <ol>\n      <li><strong>Bulk copper removal:<\/strong> The highest-removal-rate step, using aggressive oxidizing slurry chemistry to rapidly clear the bulk copper overburden down to near the barrier metal layer.<\/li>\n      <li><strong>Barrier metal clearing:<\/strong> A lower-removal-rate, higher-selectivity step that removes the thin tantalum\/tantalum nitride (Ta\/TaN) or titanium\/titanium nitride (Ti\/TiN) diffusion barrier layer separating the copper from the surrounding dielectric, typically with a different slurry chemistry optimized for barrier metal removal selectivity over both copper and dielectric.<\/li>\n      <li><strong>Final oxide cap CMP:<\/strong> A finishing step that removes any residual topography and achieves the final surface planarity and roughness specification before the next dielectric deposition.<\/li>\n    <\/ol>\n\n    <p>Copper CMP is highly sensitive to three defect mechanisms: <strong>dishing<\/strong> (preferential removal of copper relative to the surrounding dielectric, creating a concave plug or line surface that affects downstream electrical resistance and reliability), <strong>erosion<\/strong> (thinning of the dielectric over densely patterned copper array regions), and <strong>galvanic corrosion<\/strong> (electrochemical attack at copper-barrier metal junctions exposed to the polishing chemistry). Corrosion inhibitors \u2014 most commonly benzotriazole (BTA) \u2014 are incorporated into copper CMP slurries specifically to passivate exposed copper surfaces in low-pressure regions and suppress corrosion while still permitting mechanical removal in active contact regions.<\/p>\n\n    <div class=\"jcmp-read-more\">\n      <div class=\"jcmp-read-more-icon\">\u2192<\/div>\n      <span class=\"jcmp-read-more-text\">For the underlying chemical reaction mechanisms governing copper, oxide, and tungsten CMP: <a href=\"https:\/\/jeez-semicon.com\/zh\/blog\/How-CMP-Machines-Work-Process-Mechanics-Forces-Planarization-Physics\/\" target=\"_blank\" rel=\"noopener noreferrer\">How CMP Machines Work: Process Mechanics, Forces &amp; Planarization Physics<\/a><\/span>\n    <\/div>\n  <\/section>\n\n  <hr class=\"jcmp-hr\">\n\n  <section id=\"hkmg-cmp\">\n    <h2>High-k \/ Metal Gate (HKMG) CMP<\/h2>\n\n    <p>Advanced logic process nodes below approximately 22nm replaced traditional polysilicon\/silicon dioxide gate stacks with high-k dielectric and metal gate (HKMG) structures, introducing new CMP requirements at the gate formation stage. HKMG CMP must planarize stacks containing high-k dielectric materials such as hafnium oxide (HfO<sub>2<\/sub>) or hafnium silicate (HfSiO<sub>x<\/sub>) alongside metal gate electrode materials including titanium nitride (TiN), tantalum nitride (TaN), tungsten, and aluminum \u2014 each with distinct chemical reactivity and mechanical hardness characteristics.<\/p>\n\n    <p>The replacement-gate (gate-last) process flow widely used at advanced nodes requires a dedicated CMP step to planarize the metal gate fill and stop precisely at the surrounding dielectric, demanding tight selectivity control across this multi-material stack and adding meaningful process complexity relative to earlier polysilicon gate technology generations.<\/p>\n  <\/section>\n\n  <hr class=\"jcmp-hr\">\n\n  <section id=\"3dic-cmp\">\n    <h2>3D IC, TSV &amp; Advanced Packaging CMP<\/h2>\n\n    <p>The continued expansion of 3D IC stacking, chiplet-based heterogeneous integration, and advanced wafer-level packaging has created a rapidly growing category of CMP applications extending well beyond traditional front-end and BEOL processing, and represents one of the fastest-growing demand segments for CMP equipment and consumables through the mid-2020s.<\/p>\n\n    <h3>Through-Silicon Via (TSV) CMP<\/h3>\n    <p>TSV processing \u2014 which forms the vertical electrical connections passing through a thinned silicon die for 3D stacking \u2014 requires CMP at multiple distinct points in the process flow: first for copper fill planarization at the TSV formation stage on the front side, and again on the wafer backside after grinding to reveal the TSV copper tips, where backside CMP must precisely planarize the exposed via tips relative to the surrounding thinned silicon and dielectric liner.<\/p>\n\n    <h3>Redistribution Layer (RDL) CMP<\/h3>\n    <p>Fan-out wafer-level packaging (FOWLP) and other advanced packaging schemes use copper redistribution layers to reroute chip I\/O connections across the package substrate. RDL copper CMP shares fundamental similarities with front-end copper damascene CMP but typically operates with substantially thicker copper films and larger feature dimensions, requiring adapted process parameters and, in many cases, different slurry formulations optimized for these thicker-film removal requirements.<\/p>\n\n    <h3>Hybrid Bonding Surface Preparation CMP<\/h3>\n    <p>Direct copper-to-copper and dielectric-to-dielectric hybrid bonding \u2014 an increasingly important interconnect technology for high-bandwidth 3D stacking applications including advanced memory and logic-on-logic integration \u2014 requires an extremely demanding CMP surface preparation step. Hybrid bonding requires sub-nanometer surface roughness and tightly controlled, slightly recessed copper-to-dielectric topography across the full wafer to achieve reliable direct bonding without voids or electrical discontinuity, pushing CMP uniformity and defectivity requirements beyond even advanced-node front-end specifications.<\/p>\n  <\/section>\n\n  <hr class=\"jcmp-hr\">\n\n  <section id=\"compound-cmp\">\n    <h2>Compound Semiconductor &amp; Power Device Substrate CMP<\/h2>\n\n    <p>Silicon carbide (SiC), gallium nitride (GaN), gallium arsenide (GaAs), and sapphire substrates all require CMP surface preparation prior to epitaxial layer growth, and each presents distinct mechanical challenges compared to silicon CMP due to their substantially greater hardness and chemical inertness.<\/p>\n\n    <p>SiC, in particular, is one of the hardest materials processed in semiconductor manufacturing, requiring extended polishing cycle times, specialized abrasive systems (frequently diamond-based or carefully tuned colloidal silica formulations at specific pH ranges), and CMP tools capable of sustaining the higher mechanical forces needed to achieve commercially viable removal rates. As SiC and GaN power device adoption has accelerated through the mid-2020s \u2014 driven by electric vehicle and renewable energy power electronics demand \u2014 substrate CMP capacity and process optimization have become an increasingly significant focus area across the equipment and consumables supply chain.<\/p>\n\n    <div class=\"jcmp-cta-mid\">\n      <div class=\"jcmp-cta-mid-copy\">\n        <strong>Application-specific consumables for every CMP step<\/strong>\n        <p>JEEZ manufactures oxide, ceria-based STI, tungsten, and copper slurries, along with matched polishing pads and backing films, validated across the full range of front-end, BEOL, and advanced packaging CMP applications.<\/p>\n      <\/div>\n      <a href=\"https:\/\/jeez-semicon.com\/zh\/contact\/\" target=\"_blank\" rel=\"noopener noreferrer\" class=\"jcmp-btn-outline\">Contact JEEZ<\/a>\n    <\/div>\n  <\/section>\n\n  <hr class=\"jcmp-hr\">\n\n  <section id=\"comparison\">\n    <h2>Application Comparison Table<\/h2>\n\n    <div class=\"jcmp-table-wrap\">\n      <table class=\"jcmp-table\">\n        <thead>\n          <tr>\n            <th>\u5e94\u7528<\/th>\n            <th>Primary Abrasive<\/th>\n            <th>Key Requirement<\/th>\n            <th>Typical Removal Rate<\/th>\n          <\/tr>\n        <\/thead>\n        <tbody>\n          <tr>\n            <td><strong>Oxide ILD<\/strong><\/td>\n            <td>Silica (SiO<sub>2<\/sub>)<\/td>\n            <td>High throughput, planarization efficiency<\/td>\n            <td>1,500\u20133,500 \u00c5\/min<\/td>\n          <\/tr>\n          <tr>\n            <td><strong>STI<\/strong><\/td>\n            <td>Ceria (CeO<sub>2<\/sub>)<\/td>\n            <td>Oxide-to-nitride selectivity &gt;100:1<\/td>\n            <td>800-2,000 \u00c5\/min<\/td>\n          <\/tr>\n          <tr>\n            <td><strong>Tungsten (W-CMP)<\/strong><\/td>\n            <td>Alumina \/ Silica<\/td>\n            <td>High mechanical removal rate, low dishing<\/td>\n            <td>300\u2013800 \u00c5\/min<\/td>\n          <\/tr>\n          <tr>\n            <td><strong>Copper (bulk)<\/strong><\/td>\n            <td>Silica \/ Alumina<\/td>\n            <td>High removal rate, corrosion control (BTA)<\/td>\n            <td>4,000\u20138,000 \u00c5\/min<\/td>\n          <\/tr>\n          <tr>\n            <td><strong>Copper (barrier)<\/strong><\/td>\n            <td>Silica \/ Alumina (modified)<\/td>\n            <td>Barrier-to-copper \/ dielectric selectivity<\/td>\n            <td>200\u2013500 \u00c5\/min<\/td>\n          <\/tr>\n          <tr>\n            <td><strong>HKMG<\/strong><\/td>\n            <td>Application-specific<\/td>\n            <td>Multi-material selectivity control<\/td>\n            <td>Process-dependent<\/td>\n          <\/tr>\n          <tr>\n            <td><strong>SiC \/ GaN Substrate<\/strong><\/td>\n            <td>Diamond \/ Colloidal Silica<\/td>\n            <td>High-hardness material removal<\/td>\n            <td>0.5\u20133 \u03bcm\/hr<\/td>\n          <\/tr>\n        <\/tbody>\n      <\/table>\n    <\/div>\n\n    <p>For guidance on matching specific slurry, pad, and backing film products to each of these applications, see our complete consumable selection guide: <a href=\"https:\/\/jeez-semicon.com\/zh\/blog\/CMP-Machine-Consumables-Guide-Selecting-Slurry-Polishing-Pad-Backing-Film-for-Your-Tool\/\" target=\"_blank\" rel=\"noopener noreferrer\">CMP Machine Consumables Guide: Selecting Slurry, Polishing Pad &amp; Backing Film for Your Tool<\/a>.<\/p>\n\n    <div class=\"jcmp-cta\">\n      <div class=\"jcmp-cta-eyebrow\">Jizhi Electronic Technology Co., Ltd. \u2014 JEEZ<\/div>\n      <div class=\"jcmp-cta-title\">Application-Matched CMP Consumables, Backed by Technical Support<\/div>\n      <p>Whatever your CMP application \u2014 front-end STI, BEOL copper damascene, advanced packaging, or compound semiconductor substrate polishing \u2014 JEEZ technical engineers can help you select and qualify the right slurry, pad, and backing film configuration for your process.<\/p>\n      <a href=\"https:\/\/jeez-semicon.com\/zh\/contact\/\" target=\"_blank\" rel=\"noopener noreferrer\" class=\"jcmp-cta-btn\">Contact the JEEZ Technical Team \u2192<\/a>\n    <\/div>\n  <\/section>\n\n  <hr class=\"jcmp-hr\">\n\n  <section id=\"faq\">\n    <h2>\u5e38\u89c1\u95ee\u9898<\/h2>\n\n    <div class=\"jcmp-faq-item\">\n      <div class=\"jcmp-faq-q\">What is the difference between STI CMP and oxide ILD CMP?<\/div>\n      <div class=\"jcmp-faq-a\">\n        <p>Oxide ILD CMP planarizes inter-level dielectric layers between metal interconnects and typically uses silica-based slurries with relatively high removal rates. STI CMP, by contrast, defines transistor active regions and requires extremely high oxide-to-nitride selectivity (often exceeding 100:1) to stop precisely at a silicon nitride polish-stop layer, which requires ceria-based slurry chemistry that silica abrasives cannot match in selectivity.<\/p>\n      <\/div>\n    <\/div>\n\n    <div class=\"jcmp-faq-item\">\n      <div class=\"jcmp-faq-q\">How many polishing steps does copper CMP require?<\/div>\n      <div class=\"jcmp-faq-a\">\n        <p>Standard copper damascene CMP requires three sequential polishing steps: bulk copper removal (high removal rate, aggressive chemistry), barrier metal clearing (removing the thin Ta\/TaN or Ti\/TiN diffusion barrier), and a final oxide cap CMP for final surface planarization. Each step typically uses a distinct slurry formulation matched to its specific material removal and selectivity requirements.<\/p>\n      <\/div>\n    <\/div>\n\n    <div class=\"jcmp-faq-item\">\n      <div class=\"jcmp-faq-q\">Why does tungsten CMP require higher mechanical force than oxide CMP?<\/div>\n      <div class=\"jcmp-faq-a\">\n        <p>Tungsten is mechanically harder and chemically less reactive than silicon dioxide, requiring more aggressive abrasive content and higher applied pressure to achieve economically viable removal rates. This makes tungsten CMP one of the highest-force standard CMP applications in a typical process flow, and a primary contributor to tungsten plug dishing if not carefully controlled.<\/p>\n      <\/div>\n    <\/div>\n\n    <div class=\"jcmp-faq-item\">\n      <div class=\"jcmp-faq-q\">What CMP applications are used in 3D IC and advanced packaging?<\/div>\n      <div class=\"jcmp-faq-a\">\n        <p>3D IC and advanced packaging applications include Through-Silicon Via (TSV) CMP for both front-side copper fill and backside via tip exposure after grinding, redistribution layer (RDL) copper CMP for fan-out wafer-level packaging, and hybrid bonding surface preparation CMP, which requires sub-nanometer surface roughness and precisely controlled copper-to-dielectric recess for direct wafer-to-wafer or die-to-wafer bonding.<\/p>\n      <\/div>\n    <\/div>\n\n    <div class=\"jcmp-faq-item\">\n      <div class=\"jcmp-faq-q\">Why is SiC substrate CMP more difficult than silicon wafer CMP?<\/div>\n      <div class=\"jcmp-faq-a\">\n        <p>Silicon carbide is substantially harder and more chemically inert than silicon, requiring extended polishing cycle times, specialized diamond-based or carefully tuned colloidal silica abrasive systems, and CMP tools capable of sustaining higher mechanical forces to achieve commercially viable removal rates. SiC substrate CMP demand has grown significantly alongside increased adoption of SiC power devices in electric vehicle and renewable energy applications.<\/p>\n      <\/div>\n    <\/div>\n\n  <\/section>\n\n<\/div>\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between STI CMP and oxide ILD CMP?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Oxide ILD CMP planarizes inter-level dielectric layers between metal interconnects using silica-based slurries with relatively high removal rates. STI CMP defines transistor active regions and requires extremely high oxide-to-nitride selectivity, often exceeding 100:1, requiring ceria-based slurry chemistry that silica abrasives cannot match.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many polishing steps does copper CMP require?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Standard copper damascene CMP requires three sequential steps: bulk copper removal, barrier metal clearing of the Ta\/TaN or Ti\/TiN diffusion barrier, and a final oxide cap CMP for surface planarization. Each step typically uses a distinct slurry formulation.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Why does tungsten CMP require higher mechanical force than oxide CMP?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Tungsten is mechanically harder and chemically less reactive than silicon dioxide, requiring more aggressive abrasive content and higher applied pressure for viable removal rates, making tungsten CMP one of the highest-force standard CMP applications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What CMP applications are used in 3D IC and advanced packaging?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"3D IC and advanced packaging applications include Through-Silicon Via (TSV) CMP for front-side copper fill and backside via exposure, redistribution layer (RDL) copper CMP for fan-out packaging, and hybrid bonding surface preparation CMP requiring sub-nanometer roughness and controlled copper recess.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Why is SiC substrate CMP more difficult than silicon wafer CMP?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Silicon carbide is substantially harder and more chemically inert than silicon, requiring extended polishing times, specialized diamond-based or tuned colloidal silica abrasive systems, and tools capable of sustaining higher mechanical forces for viable removal rates.\"\n      }\n    }\n  ]\n}\n<\/script>","protected":false},"excerpt":{"rendered":"<p>Last updated: July 2026 15 min read JEEZ Technical Editorial Team \u2014 Jizhi Electronic Technology Co., Ltd. CMP machines are deployed across the full breadth of semiconductor device fabrication, from  &#8230;<\/p>","protected":false},"author":1,"featured_media":2425,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[9,59],"tags":[],"class_list":["post-2423","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-industry"],"acf":[],"_links":{"self":[{"href":"https:\/\/jeez-semicon.com\/zh\/wp-json\/wp\/v2\/posts\/2423","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jeez-semicon.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jeez-semicon.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jeez-semicon.com\/zh\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jeez-semicon.com\/zh\/wp-json\/wp\/v2\/comments?post=2423"}],"version-history":[{"count":2,"href":"https:\/\/jeez-semicon.com\/zh\/wp-json\/wp\/v2\/posts\/2423\/revisions"}],"predecessor-version":[{"id":2426,"href":"https:\/\/jeez-semicon.com\/zh\/wp-json\/wp\/v2\/posts\/2423\/revisions\/2426"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/jeez-semicon.com\/zh\/wp-json\/wp\/v2\/media\/2425"}],"wp:attachment":[{"href":"https:\/\/jeez-semicon.com\/zh\/wp-json\/wp\/v2\/media?parent=2423"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jeez-semicon.com\/zh\/wp-json\/wp\/v2\/categories?post=2423"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jeez-semicon.com\/zh\/wp-json\/wp\/v2\/tags?post=2423"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}