{"id":2072,"date":"2026-05-13T11:15:05","date_gmt":"2026-05-13T03:15:05","guid":{"rendered":"https:\/\/jeez-semicon.com\/?p=2072"},"modified":"2026-05-13T11:15:05","modified_gmt":"2026-05-13T03:15:05","slug":"cmp-slurry-abrasives-explained-silica-vs-alumina-vs-ceria","status":"publish","type":"post","link":"https:\/\/jeez-semicon.com\/ja\/blog\/cmp-slurry-abrasives-explained-silica-vs-alumina-vs-ceria\/","title":{"rendered":"CMP Slurry Abrasives Explained: Silica vs Alumina vs Ceria"},"content":{"rendered":"<!-- ============================================================\n     JEEZ Cluster Article 06\n     Title: CMP Slurry Abrasives Explained: Silica vs Alumina vs Ceria\n     URL: https:\/\/jeez-semicon.com\/blog\/cmp-slurry-abrasives-explained-silica-vs-alumina-vs-ceria\n     Brand: JEEZ \/ Jizhi Electronic Technology Co., Ltd.\n     Updated: May 2026\n     ============================================================ 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1rem;color:#fff}\n.ja6-cta h2{color:#fff;border:none;font-size:1.5rem;margin-bottom:12px;padding:0}\n.ja6-cta p{color:rgba(255,255,255,.88);margin-bottom:24px;font-size:.98rem}\n.ja6-btn{display:inline-block;background:#fff;color:#0044aa;font-family:'Trebuchet MS',sans-serif;font-size:.97rem;font-weight:700;padding:13px 32px;border-radius:50px;text-decoration:none;transition:background .2s,transform .15s}\n.ja6-btn:hover{background:#cce4ff;color:#002d7a;transform:translateY(-2px);text-decoration:none}\n\n.ja6-related{background:#f5f9ff;border:1px solid #dde8f8;border-radius:10px;padding:24px 28px;margin:2rem 0}\n.ja6-related-title{font-family:'Trebuchet MS',sans-serif;font-size:1rem;font-weight:700;color:#0d1b4b;margin-bottom:14px}\n.ja6-related-list{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:8px}\n.ja6-related-list li{margin:0}\n.ja6-related-list a{display:flex;align-items:flex-start;gap:7px;font-size:.9rem;font-family:'Trebuchet MS',sans-serif;color:#0055b3;text-decoration:none;padding:7px 9px;border-radius:6px;transition:background .15s}\n.ja6-related-list a:hover{background:#e0edff;text-decoration:none}\n.ja6-related-list a::before{content:'\u2192';color:#0066cc;font-weight:700;flex-shrink:0}\n\n.ja6-divider{border:none;border-top:1px solid #dde8f8;margin:2.5rem 0}\n.ja6-meta{display:flex;flex-wrap:wrap;gap:14px;align-items:center;padding:11px 16px;background:#f5f9ff;border-radius:8px;margin-bottom:2rem;font-size:.83rem;font-family:'Trebuchet MS',sans-serif;color:#555}\n\n@media(max-width:600px){\n  .ja6-hero{padding:32px 20px}.ja6-hero h1{font-size:1.55rem}\n  .ja6-cta{padding:28px 20px}.ja6 h2{font-size:1.4rem}\n  .ja6-decision-row{flex-direction:column}.ja6-decision-q{width:auto}\n}\n<\/style>\n\n<div class=\"ja6\">\n\n<div class=\"ja6-hero\">\n  <div class=\"ja6-hero-label\">Technical Deep Dive \u00b7 Updated May 2026<\/div>\n  <p class=\"ja6-hero-sub\">A detailed technical comparison of the three dominant abrasive types used in semiconductor CMP slurries \u2014 covering particle chemistry, hardness, size effects, removal mechanisms, surface finish, and application-specific selection guidance.<\/p>\n  <div class=\"ja6-hero-meta\">\n    <span>JEEZ Engineering Team<\/span>\n    <span>May 2026<\/span>\n    <span>~2,600 words \u00b7 12 min read<\/span>\n  <\/div>\n<\/div>\n\n<div class=\"ja6-meta\">\n  <span>\ud83d\udcdd JEEZ Technical Editorial<\/span>\n  <span>\ud83d\udcc5 May 2026<\/span>\n  <span>\ud83c\udfed Jizhi Electronic Technology Co., Ltd.<\/span>\n<\/div>\n\n<nav class=\"ja6-toc\">\n  <div class=\"ja6-toc-title\">\u76ee\u6b21<\/div>\n  <ol>\n    <li><a href=\"#a-role\">The Role of Abrasives in CMP Slurry<\/a><\/li>\n    <li><a href=\"#a-silica\">Colloidal Silica (SiO\u2082): The Precision Abrasive<\/a><\/li>\n    <li><a href=\"#a-alumina\">Alumina (Al\u2082O\u2083): The High-Energy Abrasive<\/a><\/li>\n    <li><a href=\"#a-ceria\">Ceria (CeO\u2082): The Chemically Active Abrasive<\/a><\/li>\n    <li><a href=\"#a-compare\">Head-to-Head Comparison Table<\/a><\/li>\n    <li><a href=\"#a-particle\">Particle Size, Distribution, and LPC<\/a><\/li>\n    <li><a href=\"#a-zeta\">Zeta Potential and Dispersion Stability<\/a><\/li>\n    <li><a href=\"#a-diamond\">Diamond Abrasives: The Special Case<\/a><\/li>\n    <li><a href=\"#a-decision\">Quick Decision Guide: Which Abrasive for Your Application?<\/a><\/li>\n    <li><a href=\"#a-jeez\">JEEZ Abrasive Engineering Approach<\/a><\/li>\n  <\/ol>\n<\/nav>\n\n<p>The abrasive particles suspended in a CMP slurry are the physical engine of material removal. While the liquid phase chemistry governs selectivity, corrosion control, and surface passivation, it is the abrasive that determines how efficiently the chemically modified surface is mechanically removed \u2014 and how much damage is done in the process. Selecting the right abrasive type is therefore not a secondary decision; it is often the first and most consequential choice in CMP slurry formulation.<\/p>\n\n<p>This article provides a detailed technical comparison of the three abrasive types that together account for the overwhelming majority of CMP slurry applications in the semiconductor industry: colloidal silica, alumina, and ceria. A fourth abrasive \u2014 diamond \u2014 is covered in a dedicated section for its specific role in wide-bandgap substrate polishing. For context on how these abrasives fit into complete slurry formulations, see: <a href=\"https:\/\/jeez-semicon.com\/ja\/blog\/what-is-cmp-slurry-a-complete-guide-to-chemical-mechanical-planarization\/\" target=\"_blank\" rel=\"noopener\">What Is CMP Slurry? A Complete Guide to Chemical Mechanical Planarization<\/a>.<\/p>\n\n<hr class=\"ja6-divider\">\n\n<h2 id=\"a-role\">1. The Role of Abrasives in CMP Slurry<\/h2>\n\n<p>In the dual-mechanism model of CMP material removal, abrasive particles are responsible for the mechanical component. They physically impact the wafer surface under the combined pressure of the polishing downforce and the relative velocity between the wafer and the rotating pad, abrading the surface layer that has been chemically softened or transformed by the liquid phase chemistry.<\/p>\n\n<p>The effectiveness of this abrasion depends on five particle-level parameters:<\/p>\n<ul>\n  <li><strong>Hardness:<\/strong> Particles that are harder than the target film material abrade it efficiently; particles softer than the target film do not. This single constraint eliminates most abrasives for most applications.<\/li>\n  <li><strong>Size (mean diameter and distribution):<\/strong> Larger particles deliver higher per-particle contact pressure and higher removal rates but increase scratch risk. Smaller particles give gentler abrasion and better surface finish but lower MRR. The particle size distribution \u2014 particularly the tail at large sizes \u2014 is often more important than the mean.<\/li>\n  <li><strong>Morphology:<\/strong> Spherical particles produce more uniform, less damaging contact than irregular or angular particles. Synthesis method determines morphology \u2014 colloidal silica produced by the St\u00f6ber process is highly spherical; fumed alumina particles are jagged and angular.<\/li>\n  <li><strong>Surface chemistry:<\/strong> The chemical functionality of the abrasive surface affects how particles interact with the film being polished, how well they disperse in solution, and whether they chemically contribute to removal (as ceria does) or act purely mechanically.<\/li>\n  <li><strong>Concentration:<\/strong> Removal rate typically increases with abrasive concentration up to a saturation point, above which additional particles compete for contact sites without providing incremental MRR. Optimal concentration is application-specific and must be determined experimentally.<\/li>\n<\/ul>\n\n<div class=\"ja6-callout\">\n  <p><strong>Critical insight:<\/strong> In CMP, abrasive hardness must be matched to the target film, not maximized. Using the hardest available abrasive (diamond) on a soft film like SiO\u2082 produces catastrophic scratch defects, not higher MRR. The goal is to select the minimum hardness abrasive that delivers required removal rate \u2014 this minimizes subsurface damage and post-CMP defect density.<\/p>\n<\/div>\n\n<hr class=\"ja6-divider\">\n\n<h2 id=\"a-silica\">2. Colloidal Silica (SiO\u2082): The Precision Abrasive<\/h2>\n\n<div class=\"ja6-abrasive-card\">\n  <div class=\"ja6-abrasive-name\">\u30b3\u30ed\u30a4\u30c0\u30eb\u30fb\u30b7\u30ea\u30ab<\/div>\n  <div class=\"ja6-abrasive-formula\">SiO\u2082 \u00b7 Mohs Hardness: ~7 \u00b7 Density: 2.2 g\/cm\u00b3<\/div>\n  <div class=\"ja6-props\">\n    <div class=\"ja6-prop\"><span class=\"ja6-prop-k\">Morphology<\/span><span class=\"ja6-prop-v\">Spherical<\/span><\/div>\n    <div class=\"ja6-prop\"><span class=\"ja6-prop-k\">Typical Size<\/span><span class=\"ja6-prop-v\">20\u2013150 nm<\/span><\/div>\n    <div class=\"ja6-prop\"><span class=\"ja6-prop-k\">pH Stability<\/span><span class=\"ja6-prop-v\">2\u201311 (varies)<\/span><\/div>\n    <div class=\"ja6-prop\"><span class=\"ja6-prop-k\">Surface Finish<\/span><span class=\"ja6-prop-v\">Excellent (lowest)<\/span><\/div>\n    <div class=\"ja6-prop\"><span class=\"ja6-prop-k\">Scratch Risk<\/span><span class=\"ja6-prop-v\">\u4f4e\u3044<\/span><\/div>\n    <div class=\"ja6-prop\"><span class=\"ja6-prop-k\">MRR (relative)<\/span><span class=\"ja6-prop-v\">Low\u2013Medium<\/span><\/div>\n  <\/div>\n\n  <div class=\"ja6-apps\">\n    <span class=\"ja6-app-tag ja6-silica-tag\">Silicon wafer final polish<\/span>\n    <span class=\"ja6-app-tag ja6-silica-tag\">Copper CMP (all stages)<\/span>\n    <span class=\"ja6-app-tag ja6-silica-tag\">Barrier \/ Ta removal<\/span>\n    <span class=\"ja6-app-tag ja6-silica-tag\">Low-k dielectric<\/span>\n    <span class=\"ja6-app-tag ja6-silica-tag\">ILD planarization<\/span>\n  <\/div>\n\n  <p>Colloidal silica is produced by controlled hydrolysis and condensation of silicon alkoxide precursors (typically the St\u00f6ber process) or by ion-exchange of sodium silicate solutions. Both methods yield particles with highly uniform spherical morphology and narrow size distributions \u2014 properties that are directly responsible for the abrasive&#8217;s hallmark characteristic: the ability to produce exceptionally smooth, low-defect surfaces.<\/p>\n\n  <p>At pH 10\u201311 (alkaline conditions used for silicon wafer polishing), silica particles carry a high negative surface charge (zeta potential of \u221240 to \u221260 mV), which creates strong electrostatic repulsion between particles and the silicon wafer surface. This electrostatic effect acts as a molecular &#8220;cushion&#8221; that limits the depth of mechanical penetration, suppressing subsurface damage even under significant downforce. The result is a polishing mechanism that approaches chemical mechanical dissolution more than mechanical abrasion \u2014 and surface roughness values (Ra) below 0.05 nm are achievable on silicon under optimized conditions.<\/p>\n\n  <p>For copper CMP, colloidal silica at near-neutral pH (7\u20139) delivers the combination of gentle abrasion (minimizing copper dishing and film roughness) and compatibility with hydrogen peroxide oxidizer and BTA corrosion inhibitor that the damascene process requires. The silica particles themselves are chemically inert to copper under these conditions, meaning that the removal rate is primarily controlled by the liquid phase chemistry rather than abrasive hardness \u2014 giving formulation engineers precise control over the selectivity and removal rate profile.<\/p>\n\n  <p><strong>Key limitation:<\/strong> Colloidal silica&#8217;s relatively low hardness (Mohs ~7) means it cannot abrade materials harder than glass-like SiO\u2082 at useful rates. Tungsten (Mohs 7.5, as WO\u2083) is borderline; tungsten metal and silicon carbide are simply too hard for silica abrasives to address at production-viable removal rates.<\/p>\n<\/div>\n\n<hr class=\"ja6-divider\">\n\n<h2 id=\"a-alumina\">3. Alumina (Al\u2082O\u2083): The High-Energy Abrasive<\/h2>\n\n<div class=\"ja6-abrasive-card alumina\">\n  <div class=\"ja6-abrasive-name\">Alumina (Alpha and Gamma Phases)<\/div>\n  <div class=\"ja6-abrasive-formula\">Al\u2082O\u2083 \u00b7 Mohs Hardness: 9 (\u03b1-phase) \u00b7 Density: 3.99 g\/cm\u00b3<\/div>\n  <div class=\"ja6-props\">\n    <div class=\"ja6-prop\"><span class=\"ja6-prop-k\">Morphology<\/span><span class=\"ja6-prop-v\">Angular (fumed) \/ Spherical (calcined)<\/span><\/div>\n    <div class=\"ja6-prop\"><span class=\"ja6-prop-k\">Typical Size<\/span><span class=\"ja6-prop-v\">50\u2013500 nm<\/span><\/div>\n    <div class=\"ja6-prop\"><span class=\"ja6-prop-k\">pH Stability<\/span><span class=\"ja6-prop-v\">2\u20136 (best)<\/span><\/div>\n    <div class=\"ja6-prop\"><span class=\"ja6-prop-k\">Surface Finish<\/span><span class=\"ja6-prop-v\">Moderate\u2013Poor<\/span><\/div>\n    <div class=\"ja6-prop\"><span class=\"ja6-prop-k\">Scratch Risk<\/span><span class=\"ja6-prop-v\">High (angular)<\/span><\/div>\n    <div class=\"ja6-prop\"><span class=\"ja6-prop-k\">MRR (relative)<\/span><span class=\"ja6-prop-v\">\u9ad8\u3044<\/span><\/div>\n  <\/div>\n\n  <div class=\"ja6-apps\">\n    <span class=\"ja6-app-tag ja6-alumina-tag\">Tungsten (W) CMP<\/span>\n    <span class=\"ja6-app-tag ja6-alumina-tag\">SiC coarse polishing<\/span>\n    <span class=\"ja6-app-tag ja6-alumina-tag\">Metal film removal<\/span>\n    <span class=\"ja6-app-tag ja6-alumina-tag\">Sapphire substrate<\/span>\n  <\/div>\n\n  <p>Alumina&#8217;s hardness of Mohs 9 \u2014 second only to diamond among commercially practical abrasives \u2014 makes it the material of choice for applications requiring aggressive mechanical abrasion of hard metal films. In tungsten CMP, the alumina particles abrade the WO\u2083 oxidation product formed on the tungsten surface by hydrogen peroxide at acidic pH, maintaining removal rates of 100\u2013400 nm\/min on tungsten metal films under standard process conditions.<\/p>\n\n  <p>Alumina exists in multiple crystallographic phases with different hardness and reactivity profiles. Alpha-alumina (corundum) is the hardest and most stable phase, with a Mohs hardness of 9. Gamma-alumina is a metastable phase with slightly lower hardness and higher surface area, which gives it different dispersion and reactivity characteristics. Most tungsten CMP slurries use fumed or calcined alumina in a mixture of phases, with particle surface treatments to improve dispersion stability at the acidic pH values required for tungsten oxidation.<\/p>\n\n  <p>The primary drawback of alumina abrasives is their angular, irregular particle morphology \u2014 a consequence of the high-temperature synthesis processes (flame hydrolysis for fumed alumina, calcination for calcined alumina) that produce sharp particle edges and facets. These edges concentrate mechanical stress at the wafer-particle contact point, dramatically increasing scratch defect risk compared to spherical silica. Managing scratch defects in tungsten CMP is therefore a critical formulation challenge, addressed through particle size reduction, surface rounding treatments, and careful optimization of the abrasive concentration and downforce.<\/p>\n\n  <div class=\"ja6-warning\">\n    <p><strong>Process warning:<\/strong> Alumina particles are highly persistent \u2014 they adhere strongly to post-CMP surfaces due to their positive surface charge at acidic pH interacting with negatively charged dielectric surfaces. Post-CMP cleaning after alumina-based slurry processes requires specially formulated cleaning chemistries at elevated pH to reverse the electrostatic attraction and remove alumina residues. Incomplete alumina removal causes yield-killing particle defects in subsequent process steps.<\/p>\n  <\/div>\n<\/div>\n\n<hr class=\"ja6-divider\">\n\n<h2 id=\"a-ceria\">4. Ceria (CeO\u2082): The Chemically Active Abrasive<\/h2>\n\n<div class=\"ja6-abrasive-card ceria\">\n  <div class=\"ja6-abrasive-name\">Ceria (Cerium Dioxide)<\/div>\n  <div class=\"ja6-abrasive-formula\">CeO\u2082 \u00b7 Mohs Hardness: ~6 \u00b7 Density: 7.65 g\/cm\u00b3<\/div>\n  <div class=\"ja6-props\">\n    <div class=\"ja6-prop\"><span class=\"ja6-prop-k\">Morphology<\/span><span class=\"ja6-prop-v\">Polycrystalline faceted<\/span><\/div>\n    <div class=\"ja6-prop\"><span class=\"ja6-prop-k\">Typical Size<\/span><span class=\"ja6-prop-v\">50\u2013300 nm (primary); colloidal: 3\u201330 nm<\/span><\/div>\n    <div class=\"ja6-prop\"><span class=\"ja6-prop-k\">pH Stability<\/span><span class=\"ja6-prop-v\">4-8<\/span><\/div>\n    <div class=\"ja6-prop\"><span class=\"ja6-prop-k\">Surface Finish<\/span><span class=\"ja6-prop-v\">Good (oxide surfaces)<\/span><\/div>\n    <div class=\"ja6-prop\"><span class=\"ja6-prop-k\">Scratch Risk<\/span><span class=\"ja6-prop-v\">\u30df\u30c7\u30a3\u30a2\u30e0<\/span><\/div>\n    <div class=\"ja6-prop\"><span class=\"ja6-prop-k\">MRR (relative)<\/span><span class=\"ja6-prop-v\">Very High (on SiO\u2082)<\/span><\/div>\n  <\/div>\n\n  <div class=\"ja6-apps\">\n    <span class=\"ja6-app-tag ja6-ceria-tag\">STI CMP (oxide:nitride selectivity)<\/span>\n    <span class=\"ja6-app-tag ja6-ceria-tag\">ILD \/ dielectric planarization<\/span>\n    <span class=\"ja6-app-tag ja6-ceria-tag\">SiC final finishing<\/span>\n    <span class=\"ja6-app-tag ja6-ceria-tag\">High-MRR oxide removal<\/span>\n  <\/div>\n\n  <p>Ceria occupies a unique position among CMP abrasives because it is not purely mechanical in its action \u2014 it participates directly in the chemical removal mechanism through a process known as the <strong>Ce\u2013O\u2013Si bond formation model<\/strong>. At the contact interface between a CeO\u2082 particle and a SiO\u2082 surface, cerium ions (Ce\u2074\u207a and Ce\u00b3\u207a) form direct chemical bonds with the surface silanol groups (Si\u2013OH), creating a Ce\u2013O\u2013Si bridge that mechanically weakens the SiO\u2082 surface lattice. When the abrasive particle is then moved by the polishing kinematics, this chemical bond allows it to &#8220;pull&#8221; surface Si\u2013O groups away from the bulk \u2014 achieving removal rates on SiO\u2082 that are 5 to 10 times higher than colloidal silica at equivalent abrasive concentration and process conditions.<\/p>\n\n  <p>This chemical-mechanical synergy is what makes ceria uniquely suited for oxide and STI CMP. But the same mechanism \u2014 selective bonding to silanol groups \u2014 is also responsible for ceria&#8217;s exceptional oxide-to-nitride selectivity. Silicon nitride surfaces present a very different surface chemistry (Si\u2013N bonds, fewer free silanol groups), with which ceria particles form much weaker chemical bonds. The result is dramatically lower removal rate on nitride compared to oxide \u2014 ratios of 50:1 to over 200:1 depending on formulation and process conditions \u2014 giving process engineers the precise stop-on-nitride capability that STI CMP demands.<\/p>\n\n  <h4>Colloidal vs. Calcined Ceria<\/h4>\n  <p>Two distinct forms of ceria are used in CMP slurries. <strong>Calcined ceria<\/strong> (produced by high-temperature decomposition of cerium precursors) yields relatively large, polycrystalline particles (100\u2013500 nm) with high hardness and high removal rates, but elevated scratch risk due to particle size and surface roughness. <strong>Colloidal ceria<\/strong> (synthesized by low-temperature wet chemistry routes) produces much smaller, more uniform particles (3\u201350 nm) with superior surface finish and lower defectivity \u2014 at the cost of somewhat lower removal rate. Advanced STI CMP formulations have largely migrated toward colloidal or abrasive-tuned ceria particles as node scaling has tightened defect budgets.<\/p>\n\n  <p>JEEZ ceria-based slurries are formulated with controlled particle size distributions and anionic polymer additives that modulate the oxide:nitride selectivity ratio to match specific STI and ILD process requirements without sacrificing dispersion stability or LPC performance.<\/p>\n<\/div>\n\n<hr class=\"ja6-divider\">\n\n<h2 id=\"a-compare\">5. Head-to-Head Comparison Table<\/h2>\n\n<div class=\"ja6-table-wrap\">\n  <table class=\"ja6-table\">\n    <thead>\n      <tr>\n        <th>\u30d7\u30ed\u30d1\u30c6\u30a3<\/th>\n        <th>\u30b3\u30ed\u30a4\u30c0\u30eb\u30fb\u30b7\u30ea\u30ab<\/th>\n        <th>\u30a2\u30eb\u30df\u30ca<\/th>\n        <th>\u30bb\u30ea\u30a2<\/th>\n      <\/tr>\n    <\/thead>\n    <tbody>\n      <tr><td><strong>\u30e2\u30fc\u30b9\u786c\u5ea6<\/strong><\/td><td>~7<\/td><td>~9<\/td><td>~6<\/td><\/tr>\n      <tr><td><strong>Removal mechanism<\/strong><\/td><td>Mechanical + mild chemical<\/td><td>Predominantly mechanical<\/td><td>Chemical-mechanical (Ce\u2013O\u2013Si)<\/td><\/tr>\n      <tr><td><strong>Typical particle size<\/strong><\/td><td>20\u2013150 nm<\/td><td>50\u2013500 nm<\/td><td>3\u2013300 nm (form-dependent)<\/td><\/tr>\n      <tr><td><strong>Morphology<\/strong><\/td><td class=\"hi\">Spherical (best)<\/td><td class=\"lo\">Angular (worst)<\/td><td class=\"med\">Faceted (moderate)<\/td><\/tr>\n      <tr><td><strong>\u8868\u9762\u7c97\u3055\uff08Ra\uff09<\/strong><\/td><td class=\"hi\">Lowest (&lt;0.1 nm on Si)<\/td><td class=\"lo\">Highest<\/td><td class=\"med\">\u4e2d\u7a0b\u5ea6<\/td><\/tr>\n      <tr><td><strong>\u50b7\u306e\u30ea\u30b9\u30af<\/strong><\/td><td class=\"hi\">\u4f4e\u3044<\/td><td class=\"lo\">\u9ad8\u3044<\/td><td class=\"med\">\u30df\u30c7\u30a3\u30a2\u30e0<\/td><\/tr>\n      <tr><td><strong>MRR on SiO\u2082<\/strong><\/td><td class=\"med\">\u4e2d\u7a0b\u5ea6<\/td><td class=\"med\">\u4e2d\u7a0b\u5ea6<\/td><td class=\"hi\">\u975e\u5e38\u306b\u9ad8\u3044<\/td><\/tr>\n      <tr><td><strong>Oxide:Nitride selectivity<\/strong><\/td><td class=\"lo\">Low (~1:1 to 3:1)<\/td><td class=\"lo\">\u4f4e\u3044<\/td><td class=\"hi\">Very High (50\u2013200:1)<\/td><\/tr>\n      <tr><td><strong>Tungsten MRR<\/strong><\/td><td class=\"lo\">\u975e\u5e38\u306b\u4f4e\u3044<\/td><td class=\"hi\">\u9ad8\u3044<\/td><td class=\"lo\">\u4f4e\u3044<\/td><\/tr>\n      <tr><td><strong>Post-CMP cleaning<\/strong><\/td><td class=\"hi\">Easy<\/td><td class=\"lo\">Difficult (alumina residues)<\/td><td class=\"med\">\u4e2d\u7a0b\u5ea6<\/td><\/tr>\n      <tr><td><strong>Cost (relative)<\/strong><\/td><td class=\"hi\">Low\u2013Medium<\/td><td class=\"med\">\u30df\u30c7\u30a3\u30a2\u30e0<\/td><td class=\"lo\">High (rare earth precursor)<\/td><\/tr>\n      <tr><td><strong>Supply chain risk<\/strong><\/td><td class=\"hi\">\u4f4e\u3044<\/td><td class=\"med\">\u30df\u30c7\u30a3\u30a2\u30e0<\/td><td class=\"lo\">High (China RE concentration)<\/td><\/tr>\n      <tr><td><strong>Primary applications<\/strong><\/td><td>Cu, Si wafer, barrier, low-k<\/td><td>Tungsten, SiC coarse<\/td><td>STI, ILD, oxide CMP<\/td><\/tr>\n    <\/tbody>\n  <\/table>\n<\/div>\n\n<hr class=\"ja6-divider\">\n\n<h2 id=\"a-particle\">6. Particle Size, Distribution, and Large Particle Count (LPC)<\/h2>\n\n<p>Of all the abrasive particle parameters, the <strong>particle size distribution tail<\/strong> \u2014 specifically the concentration of particles larger than 1 \u00b5m, quantified as the Large Particle Count (LPC) \u2014 has the most direct impact on post-CMP defect density. A single 2 \u00b5m agglomerate in a slurry can cause a scratch that propagates across multiple adjacent device features, potentially causing correlated yield loss that is far larger than a random single-point defect.<\/p>\n\n<p>Production-grade CMP slurries specify LPC limits typically in the range of 20\u2013100 particles per mL at a threshold of 0.5\u20131 \u00b5m. Maintaining this specification requires: (1) controlled synthesis to minimize primary particle size variability; (2) effective dispersion during manufacturing to prevent agglomeration; (3) point-of-use filtration at the CMP tool using absolute-rated membrane filters (typically 0.2\u20131 \u00b5m rating); and (4) controlled storage and dispensing to avoid mechanical or thermal shock that can induce agglomeration.<\/p>\n\n<div class=\"ja6-tip\">\n  <p><strong>Best practice:<\/strong> Always specify LPC measurement methodology when comparing slurry CoA data between suppliers \u2014 particle counting by light obscuration (HIAC\/Royco method) and laser diffraction give different results for the same sample. Agree on a single measurement method and threshold size as part of the incoming inspection specification during slurry qualification. See our post-CMP defect analysis guide for more detail: <a href=\"https:\/\/jeez-semicon.com\/ja\/blog\/post-cmp-defect-analysis-scratches-lpc-and-inspection-methods\/\" target=\"_blank\" rel=\"noopener\">Post-CMP Defect Analysis: Scratches, LPC &amp; Inspection Methods<\/a>.<\/p>\n<\/div>\n\n<hr class=\"ja6-divider\">\n\n<h2 id=\"a-zeta\">7. Zeta Potential and Dispersion Stability<\/h2>\n\n<p>Zeta potential \u2014 the electrokinetic surface charge of abrasive particles in suspension \u2014 is the primary determinant of long-term slurry dispersion stability. Particles with high absolute zeta potential (|\u03b6| &gt; 30 mV) experience strong mutual electrostatic repulsion, resisting agglomeration and maintaining a stable, well-dispersed suspension over time. Particles with low absolute zeta potential (|\u03b6| &lt; 15 mV) are prone to flocculation \u2014 the gradual aggregation of primary particles into larger clusters that eventually settle and generate LPC events at the tool.<\/p>\n\n<p>Each abrasive type has a characteristic isoelectric point (IEP) \u2014 the pH at which zeta potential crosses zero and dispersion stability is minimum. For silica, the IEP is at approximately pH 2\u20133, meaning it is well-dispersed at the alkaline conditions used for silicon wafer polishing (pH 10\u201311) but approaches its IEP at the acidic conditions used in tungsten CMP \u2014 one reason silica is not used as a primary abrasive for tungsten applications. Alumina has an IEP near pH 8\u20139, meaning it is positively charged and well-dispersed at the acidic conditions (pH 2\u20134) required for tungsten CMP. Ceria&#8217;s IEP is near pH 6\u20138, making it well-dispersed at the near-neutral to slightly acidic conditions used for oxide CMP.<\/p>\n\n<p>Slurry formulators add anionic and cationic surfactants, polymeric dispersants, and pH buffers to extend the usable zeta potential range of each abrasive system beyond its natural stability window \u2014 but the underlying physics of the IEP cannot be fully overcome through additives alone. Selecting an abrasive type whose natural zeta potential is compatible with the target pH range is always preferable to fighting the IEP with additives.<\/p>\n\n<hr class=\"ja6-divider\">\n\n<h2 id=\"a-diamond\">8. Diamond Abrasives: The Special Case<\/h2>\n\n<p>Diamond is the hardest known material (Mohs 10) and serves as the abrasive of last resort for polishing substrates too hard to be addressed by silica, alumina, or ceria. In the semiconductor industry, this means primarily <strong>silicon carbide (SiC)<\/strong> substrate polishing, where diamond&#8217;s hardness advantage is necessary to achieve production-viable removal rates in the stock removal stage.<\/p>\n\n<p>Diamond slurries for CMP use either synthetic monocrystalline diamond particles (typically 0.1\u20131 \u00b5m for CMP applications) or polycrystalline diamond (PCD) particles with tightly controlled size distributions. The extreme hardness of diamond makes scratch defect control particularly challenging \u2014 even sub-micron diamond particles can cause deep subsurface damage on SiC if particle size distribution is not tightly controlled. As a result, SiC polishing processes typically use diamond slurries only for the coarse and intermediate removal stages, transitioning to softer abrasives (ceria or colloidal silica) for the final finish stage where surface quality and Ra targets are most demanding.<\/p>\n\n<p>Diamond slurries are significantly more expensive than oxide-based abrasives and require specialized handling and tool cleaning procedures. They are not used for standard silicon-based CMP applications under any circumstances \u2014 the hardness mismatch would cause catastrophic scratch defects on silicon wafers. For a complete discussion of SiC polishing challenges and the multi-stage process using diamond and other abrasives, see: <a href=\"https:\/\/jeez-semicon.com\/ja\/blog\/cmp-slurry-for-sic-wafer-polishing-challenges-and-solutions\/\" target=\"_blank\" rel=\"noopener\">CMP Slurry for SiC Wafer Polishing: Challenges &amp; Solutions<\/a>.<\/p>\n\n<hr class=\"ja6-divider\">\n\n<h2 id=\"a-decision\">9. Quick Decision Guide: Which Abrasive for Your Application?<\/h2>\n\n<div class=\"ja6-decision\">\n  <div class=\"ja6-decision-title\">\ud83d\udd0d Abrasive Selection Quick Reference<\/div>\n  <div class=\"ja6-decision-row\">\n    <div class=\"ja6-decision-q\">Polishing silicon wafers to epi-ready finish?<\/div>\n    <div class=\"ja6-decision-a\"><strong>\u30b3\u30ed\u30a4\u30c0\u30eb\u30fb\u30b7\u30ea\u30ab<\/strong> at pH 10\u201311. Sub-0.1 nm Ra achievable. No other abrasive delivers this surface quality on Si.<\/div>\n  <\/div>\n  <div class=\"ja6-decision-row\">\n    <div class=\"ja6-decision-q\">STI CMP with stop-on-nitride requirement?<\/div>\n    <div class=\"ja6-decision-a\"><strong>\u30bb\u30ea\u30a2<\/strong> \u2014 only abrasive with inherently high oxide:nitride selectivity (50:1+). Colloidal or calcined depending on defect budget vs. MRR requirement.<\/div>\n  <\/div>\n  <div class=\"ja6-decision-row\">\n    <div class=\"ja6-decision-q\">Copper damascene removal (all three stages)?<\/div>\n    <div class=\"ja6-decision-a\"><strong>\u30b3\u30ed\u30a4\u30c0\u30eb\u30fb\u30b7\u30ea\u30ab<\/strong> with H\u2082O\u2082 and BTA. Gentle abrasion essential for dishing\/erosion control. Alumina and ceria both incompatible.<\/div>\n  <\/div>\n  <div class=\"ja6-decision-row\">\n    <div class=\"ja6-decision-q\">Tungsten contact\/via fill CMP?<\/div>\n    <div class=\"ja6-decision-a\"><strong>\u30a2\u30eb\u30df\u30ca<\/strong> at pH 2\u20134 with H\u2082O\u2082. No other standard abrasive provides adequate MRR on WO\u2083 at commercially useful rates.<\/div>\n  <\/div>\n  <div class=\"ja6-decision-row\">\n    <div class=\"ja6-decision-q\">ILD oxide planarization (no stop layer)?<\/div>\n    <div class=\"ja6-decision-a\"><strong>\u30bb\u30ea\u30a2<\/strong> for high throughput, or <strong>\u30b3\u30ed\u30a4\u30c0\u30eb\u30fb\u30b7\u30ea\u30ab<\/strong> for superior surface finish where roughness spec is tight.<\/div>\n  <\/div>\n  <div class=\"ja6-decision-row\">\n    <div class=\"ja6-decision-q\">SiC wafer stock removal?<\/div>\n    <div class=\"ja6-decision-a\"><strong>Diamond<\/strong> slurry (0.25\u20131 \u00b5m particles). SiC at Mohs 9.5 requires diamond&#8217;s hardness for practical MRR. Alumina is inadequate.<\/div>\n  <\/div>\n  <div class=\"ja6-decision-row\">\n    <div class=\"ja6-decision-q\">SiC wafer final finish (epi-ready)?<\/div>\n    <div class=\"ja6-decision-a\"><strong>\u30bb\u30ea\u30a2<\/strong> or chemically enhanced <strong>\u30b3\u30ed\u30a4\u30c0\u30eb\u30fb\u30b7\u30ea\u30ab<\/strong> with oxidizer. Diamond scratch risk too high for final stage; ceria provides the chemical assistance needed for acceptable MRR.<\/div>\n  <\/div>\n<\/div>\n\n<hr class=\"ja6-divider\">\n\n<h2 id=\"a-jeez\">10. JEEZ Abrasive Engineering Approach<\/h2>\n\n<p>At JEEZ, we treat abrasive engineering as a primary lever in slurry performance optimization, not an afterthought to liquid phase chemistry formulation. Our approach to each abrasive type reflects the specific demands of the applications we serve:<\/p>\n\n<p>For <strong>colloidal silica<\/strong> slurries \u2014 used in our copper CMP, silicon wafer, and barrier applications \u2014 we specify narrow particle size distributions (D50\/D90 ratio &gt;0.7) and tightly control zeta potential across the process pH range to ensure stability throughout the slurry shelf life. Our copper CMP slurries use silica particles with surface hydroxyl group density optimized for BTA inhibitor adsorption \u2014 a formulation variable that directly impacts the corrosion control balance of the slurry.<\/p>\n\n<p>For <strong>ceria<\/strong> slurries \u2014 used in our oxide, STI, and SiC finishing applications \u2014 we select particle size and cerium oxidation state (Ce\u00b3\u207a\/Ce\u2074\u207a ratio) to balance chemical activity against surface finish requirements. Our STI slurries include proprietary anionic polymer additives that selectively suppress the Ce\u2013O\u2013Si bond formation mechanism on nitride surfaces, enhancing selectivity beyond what the bare ceria particle chemistry delivers.<\/p>\n\n<p>For <strong>alumina<\/strong> \u305d\u3057\u3066 <strong>diamond<\/strong> slurries \u2014 used in our tungsten CMP and SiC stock removal applications \u2014 particle surface treatments are applied to reduce the sharp-edge morphology risk through controlled surface rounding, and dispersion additives are selected for compatibility with the acidic pH conditions these applications require.<\/p>\n\n<p>If you are working with an application where standard abrasive selection guidance does not produce the performance you need, JEEZ&#8217;s application engineering team can discuss custom abrasive engineering approaches. Contact us through the link below, or explore our full product range at <a href=\"https:\/\/jeez-semicon.com\/ja\/blog\/top-cmp-slurry-manufacturers-global-supplier-guide-2026\/\" target=\"_blank\" rel=\"noopener\">our supplier guide<\/a>.<\/p>\n\n<div class=\"ja6-cta\">\n  <h2>Need Help Selecting or Qualifying an Abrasive System?<\/h2>\n  <p>JEEZ engineers can advise on abrasive selection, particle size specification, zeta potential requirements, and LPC testing protocols for your specific CMP application. Reach out for a technical consultation.<\/p>\n  <a href=\"https:\/\/jeez-semicon.com\/ja\/contact\/\" target=\"_blank\" rel=\"noopener\" class=\"ja6-btn\">Contact Our Experts \u2192<\/a>\n<\/div>\n\n<div class=\"ja6-related\">\n  <div class=\"ja6-related-title\">\ud83d\udcda Related Articles from JEEZ<\/div>\n  <ul class=\"ja6-related-list\">\n    <li><a href=\"https:\/\/jeez-semicon.com\/ja\/blog\/top-cmp-slurry-manufacturers-global-supplier-guide-2026\/\" target=\"_blank\" rel=\"noopener\">Top CMP Slurry Manufacturers: Global Supplier Guide 2026<\/a><\/li>\n    <li><a href=\"https:\/\/jeez-semicon.com\/ja\/blog\/what-is-cmp-slurry-a-complete-guide-to-chemical-mechanical-planarization\/\" target=\"_blank\" rel=\"noopener\">What Is CMP Slurry? A Complete Guide<\/a><\/li>\n    <li><a href=\"https:\/\/jeez-semicon.com\/ja\/blog\/cmp-slurry-types-explained-oxide-sti-copper-tungsten-beyond\/\" target=\"_blank\" rel=\"noopener\">CMP\u30b9\u30e9\u30ea\u30fc\u306e\u7a2e\u985e\u9178\u5316\u7269\u3001STI\u3001\u9285\u3001\u30bf\u30f3\u30b0\u30b9\u30c6\u30f3\u3001\u305d\u306e\u4ed6<\/a><\/li>\n    <li><a href=\"https:\/\/jeez-semicon.com\/ja\/blog\/how-to-choose-a-cmp-slurry-selection-guide-for-semiconductor-engineers\/\" target=\"_blank\" rel=\"noopener\">How to Choose a CMP Slurry: Selection Guide<\/a><\/li>\n    <li><a href=\"https:\/\/jeez-semicon.com\/ja\/blog\/cmp-slurry-for-sic-wafer-polishing-challenges-and-solutions\/\" target=\"_blank\" rel=\"noopener\">CMP Slurry for SiC Wafer Polishing<\/a><\/li>\n    <li><a href=\"https:\/\/jeez-semicon.com\/ja\/blog\/post-cmp-defect-analysis-scratches-lpc-and-inspection-methods\/\" target=\"_blank\" rel=\"noopener\">Post-CMP Defect Analysis: Scratches, LPC &amp; Inspection<\/a><\/li>\n    <li><a href=\"https:\/\/jeez-semicon.com\/ja\/blog\/cmp-slurry-manufacturers-comparison-cabot-vs-dupont-vs-fujifilm-vs-entegris\/\" target=\"_blank\" rel=\"noopener\">Manufacturers Comparison: Cabot vs DuPont vs Fujifilm vs Entegris<\/a><\/li>\n  <\/ul>\n<\/div>\n\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Technical Deep Dive \u00b7 Updated May 2026 A detailed technical comparison of the three dominant abrasive types used in semiconductor CMP slurries \u2014 covering particle chemistry, hardness, size effects, removal  &#8230;<\/p>","protected":false},"author":1,"featured_media":2074,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[9,59],"tags":[],"class_list":["post-2072","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-industry"],"acf":[],"_links":{"self":[{"href":"https:\/\/jeez-semicon.com\/ja\/wp-json\/wp\/v2\/posts\/2072","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jeez-semicon.com\/ja\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jeez-semicon.com\/ja\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jeez-semicon.com\/ja\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jeez-semicon.com\/ja\/wp-json\/wp\/v2\/comments?post=2072"}],"version-history":[{"count":2,"href":"https:\/\/jeez-semicon.com\/ja\/wp-json\/wp\/v2\/posts\/2072\/revisions"}],"predecessor-version":[{"id":2075,"href":"https:\/\/jeez-semicon.com\/ja\/wp-json\/wp\/v2\/posts\/2072\/revisions\/2075"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/jeez-semicon.com\/ja\/wp-json\/wp\/v2\/media\/2074"}],"wp:attachment":[{"href":"https:\/\/jeez-semicon.com\/ja\/wp-json\/wp\/v2\/media?parent=2072"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jeez-semicon.com\/ja\/wp-json\/wp\/v2\/categories?post=2072"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jeez-semicon.com\/ja\/wp-json\/wp\/v2\/tags?post=2072"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}