{"id":2592,"date":"2026-08-06T13:44:26","date_gmt":"2026-08-06T05:44:26","guid":{"rendered":"https:\/\/jeez-semicon.com\/?p=2592"},"modified":"2026-08-06T13:44:26","modified_gmt":"2026-08-06T05:44:26","slug":"final-silicon-polishing-with-colloidal-silica-achieving-sub-angstrom-surface-roughness","status":"publish","type":"post","link":"https:\/\/jeez-semicon.com\/ja\/blog\/final-silicon-polishing-with-colloidal-silica-achieving-sub-angstrom-surface-roughness\/","title":{"rendered":"Final Silicon Polishing with Colloidal Silica: Achieving Sub-\u00c5ngstr\u00f6m Surface Roughness"},"content":{"rendered":"<style>\n@import url('https:\/\/fonts.googleapis.com\/css2?family=Sora:wght@400;500;600;700&family=IBM+Plex+Sans:ital,wght@0,400;0,500;0,600;1,400&display=swap');\n.jcs-wrap *{box-sizing:border-box}.jcs-wrap{font-family:'IBM Plex Sans',system-ui,sans-serif;font-size:16px;line-height:1.8;color:#1a1a2e;max-width:920px;margin:0 auto}\n.jcs-wrap h1{font-family:'Sora',sans-serif;font-size:clamp(1.7rem,4vw,2.2rem);font-weight:700;line-height:1.22;color:#fff;margin:0 0 1rem}\n.jcs-wrap h2{font-family:'Sora',sans-serif;font-size:clamp(1.15rem,2.5vw,1.45rem);font-weight:600;color:#0f1f5c;margin:2.75rem 0 .9rem;padding-bottom:.5rem;border-bottom:2px solid #dbeafe;scroll-margin-top:80px}\n.jcs-wrap h3{font-family:'Sora',sans-serif;font-size:1.07rem;font-weight:600;color:#1e3a8a;margin:1.75rem 0 .65rem}\n.jcs-wrap p{margin:0 0 1.15rem}.jcs-wrap ul,.jcs-wrap ol{margin:0 0 1.15rem;padding-left:1.5rem}.jcs-wrap li{margin-bottom:.5rem;line-height:1.75}\n.jcs-wrap strong{color:#0f1f5c;font-weight:600}.jcs-wrap a{color:#2563eb;text-decoration:underline;text-underline-offset:3px}.jcs-wrap a:hover{color:#1d4ed8}\n.jcs-hero{background:linear-gradient(140deg,#0b1840 0%,#0f2868 55%,#1a4db3 100%);border-radius:14px;padding:2.75rem 2.5rem;margin-bottom:.5rem;position:relative;overflow:hidden}\n.jcs-hero::after{content:'';position:absolute;top:-30%;right:-8%;width:55%;height:200%;background:radial-gradient(ellipse,rgba(255,255,255,.045) 0%,transparent 68%);pointer-events:none}\n.jcs-hero-tag{display:inline-block;background:rgba(255,255,255,.13);color:rgba(255,255,255,.88);font-size:.72rem;font-weight:600;letter-spacing:.1em;text-transform:uppercase;padding:.28rem .75rem;border-radius:4px;margin-bottom:.9rem}\n.jcs-hero p{color:rgba(255,255,255,.84);font-size:1.02rem;margin-bottom:.85rem;max-width:680px}\n.jcs-hero-meta{display:flex;gap:1.5rem;flex-wrap:wrap;margin-top:1.4rem;padding-top:1.1rem;border-top:1px solid rgba(255,255,255,.14)}\n.jcs-meta-pill{font-size:.78rem;color:rgba(255,255,255,.68);display:flex;align-items:center;gap:.35rem}.jcs-meta-pill b{color:rgba(255,255,255,.92)}\n.jcs-updated{display:block;font-size:.8rem;color:#94a3b8;margin:.6rem 0 2rem}\n.jcs-toc{background:#f0f7ff;border:1px solid #bfdbfe;border-radius:12px;padding:1.5rem 1.8rem;margin-bottom:2.25rem}\n.jcs-toc-label{font-family:'Sora',sans-serif;font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.12em;color:#2563eb;margin-bottom:.85rem}\n.jcs-toc ol{margin:0;padding-left:1.2rem}.jcs-toc li{margin-bottom:.45rem;font-size:.87rem}\n.jcs-toc a{color:#1e3a8a;text-decoration:none;font-weight:500}.jcs-toc a:hover{text-decoration:underline;color:#2563eb}\n.jcs-note{background:#eff6ff;border-left:4px solid #2563eb;border-radius:0 8px 8px 0;padding:1rem 1.4rem;margin:1.6rem 0}\n.jcs-note p{margin:0;color:#1e3a8a;font-size:.92rem;line-height:1.7}.jcs-note strong{color:#1e3a8a}\n.jcs-box{background:#f8faff;border:1px solid #dbeafe;border-radius:10px;padding:1.3rem 1.5rem;margin:1.6rem 0}\n.jcs-box-label{font-family:'Sora',sans-serif;font-size:.7rem;font-weight:700;text-transform:uppercase;letter-spacing:.1em;color:#2563eb;margin-bottom:.65rem}\n.jcs-box ul{margin:0}.jcs-box li{font-size:.91rem;margin-bottom:.4rem}\n.jcs-table-wrap{overflow-x:auto;margin:1.6rem 0;border-radius:10px;border:1px solid #e2e8f0}\n.jcs-wrap table{width:100%;border-collapse:collapse;font-size:.85rem}\n.jcs-wrap thead th{background:#0f1f5c;color:#fff;font-family:'Sora',sans-serif;font-weight:600;text-align:left;padding:.75rem 1rem;font-size:.79rem;white-space:nowrap}\n.jcs-wrap tbody td{border-bottom:1px solid #e2e8f0;padding:.65rem 1rem;vertical-align:top;color:#1a1a2e}\n.jcs-wrap tbody tr:nth-child(even) td{background:#f8faff}.jcs-wrap tbody tr:last-child td{border-bottom:none}\n.jcs-link-box{background:#f0f7ff;border:1px solid #bfdbfe;border-radius:8px;padding:.82rem 1.15rem;margin:1.6rem 0;display:flex;gap:.65rem;align-items:flex-start;font-size:.88rem;line-height:1.6}\n.jcs-link-box-icon{color:#2563eb;font-weight:700;font-size:1rem;flex-shrink:0;margin-top:.05rem}.jcs-link-box a{font-weight:600}\n.jcs-faq-item{border:1px solid #e2e8f0;border-radius:10px;margin-bottom:.9rem;overflow:hidden}\n.jcs-faq-q{background:#f8faff;padding:.88rem 1.2rem;font-family:'Sora',sans-serif;font-weight:600;font-size:.93rem;color:#0f1f5c;border-bottom:1px solid #e2e8f0;line-height:1.45}\n.jcs-faq-a{padding:.95rem 1.2rem;font-size:.9rem;line-height:1.75}\n.jcs-faq-a p{margin:0 0 .65rem;font-size:.9rem}.jcs-faq-a p:last-child{margin:0}\n.jcs-cta{background:linear-gradient(135deg,#0b1840 0%,#0f2868 100%);border-radius:14px;padding:2.5rem 2.25rem;text-align:center;margin:2.75rem 0 1.4rem}\n.jcs-cta h2{color:#fff;font-size:1.35rem;border:none;padding:0;margin:0 0 .65rem}\n.jcs-cta p{color:rgba(255,255,255,.82);margin-bottom:1.5rem;font-size:.97rem}\n.jcs-cta-btn{display:inline-block;background:#fff;color:#0b1840;font-family:'Sora',sans-serif;font-weight:700;font-size:.92rem;padding:.85rem 2.1rem;border-radius:6px;text-decoration:none}\n.jcs-cta-btn:hover{opacity:.9;color:#0b1840;text-decoration:none}\n.jcs-hr{border:none;border-top:1px solid #e2e8f0;margin:2.25rem 0}\n.jcs-footnote{font-size:.82rem;color:#64748b;line-height:1.65;margin-top:1.75rem}\n.jcs-footnote strong{color:#475569}\n@media(max-width:600px){.jcs-hero{padding:1.75rem 1.4rem}.jcs-cta{padding:1.75rem 1.4rem}.jcs-wrap h2{font-size:1.15rem}}\n<\/style>\n\n<article class=\"jcs-wrap\">\n<div class=\"jcs-hero\">\n  <span class=\"jcs-hero-tag\">Application Guide \u00b7 Cluster C-04<\/span>\n  <p>A comprehensive technical guide to final silicon polish (FSP) with colloidal silica CMP slurry\u2014covering surface quality specifications, slurry design principles, process parameter optimization, multi-step polish sequences, and post-CMP clean compatibility for prime and epi-ready wafers.<\/p>\n  <div class=\"jcs-hero-meta\">\n    <span class=\"jcs-meta-pill\">\ud83d\udcc5 <b>August 2026<\/b><\/span>\n    <span class=\"jcs-meta-pill\">\u23f1 <b>~14 min read<\/b><\/span>\n    <span class=\"jcs-meta-pill\">\u270d <b>JEEZ Technical Team<\/b><\/span>\n  <\/div>\n<\/div>\n<span class=\"jcs-updated\">Published by Jizhi Electronic Technology Co., Ltd. (JEEZ) \u00b7 August 2026<\/span>\n\n<nav class=\"jcs-toc\" aria-label=\"\u76ee\u6b21\">\n  <p class=\"jcs-toc-label\">\u76ee\u6b21<\/p>\n  <ol>\n    <li><a href=\"#why-demanding\">Why Final Silicon Polish Is the Most Demanding CMP Step<\/a><\/li>\n    <li><a href=\"#specifications\">Surface Quality Specifications for Prime and Epi-Ready Wafers<\/a><\/li>\n    <li><a href=\"#slurry-design\">Slurry Design for Sub-\u00c5ngstr\u00f6m Surface Quality<\/a><\/li>\n    <li><a href=\"#process-parameters\">Process Parameters and Pad Selection<\/a><\/li>\n    <li><a href=\"#multi-step\">Multi-Step Polish Sequences<\/a><\/li>\n    <li><a href=\"#post-cmp-clean\">Post-CMP Clean Compatibility<\/a><\/li>\n    <li><a href=\"#failure-modes\">Common Failure Modes and Root Causes<\/a><\/li>\n    <li><a href=\"#jeez-cs20\">JEEZ CS-20 Series for Final Silicon Polish<\/a><\/li>\n    <li><a href=\"#faq\">\u3088\u304f\u3042\u308b\u8cea\u554f<\/a><\/li>\n  <\/ol>\n<\/nav>\n\n<p>Among all chemical mechanical planarization steps performed in semiconductor manufacturing, silicon wafer final polishing stands apart in the severity of its surface quality requirements. While oxide CMP and STI planarization tolerate surface roughness on the order of 0.5\u20131.0 nm RMS, final silicon polish must achieve roughness below 0.1 nm (1 \u00c5ngstr\u00f6m) RMS\u2014an order of magnitude tighter\u2014while simultaneously delivering light-point defect (LPD) counts below 50 particles at sub-100 nm detection thresholds, nanotopography within 10 nm peak-to-valley across 10\u00d710 mm sites, and surface metal contamination below 5\u00d710\u00b9\u2070 atoms\/cm\u00b2 for critical elements.<\/p>\n\n<p>Colloidal silica is the only commercially available abrasive capable of meeting these specifications in production. But selecting the right colloidal silica grade and optimizing the process parameters requires a detailed understanding of how each slurry variable connects to each surface quality outcome\u2014the subject of this guide.<\/p>\n\n<section id=\"why-demanding\">\n  <h2>1. Why Final Silicon Polish Is the Most Demanding CMP Step<\/h2>\n  <p>Final silicon polish (FSP) is the last mechanical processing step in silicon wafer manufacturing before the wafer is shipped to device fabrication. Every defect introduced at FSP\u2014whether a surface scratch, a sub-surface damage layer, a haze-causing roughness contribution, or a metal contamination residue\u2014propagates directly into the device fab&#8217;s incoming wafer quality and cannot be corrected downstream. There is no subsequent processing step to mask or repair FSP-induced defects.<\/p>\n  <p>The increasingly stringent FSP requirements are driven by advanced device technology requirements. At 2 nm logic nodes, the gate dielectric thickness is below 1 nm (effective oxide thickness), meaning the electronic quality of the Si-SiO\u2082 interface is governed by sub-angstrom features of the underlying silicon surface. For epitaxial applications (GaN-on-Si, SiGe layers for strained channels), the surface must be essentially free of crystallographic defects\u2014pits, hillocks, or surface steps\u2014that would propagate as threading dislocations through the epitaxial film.<\/p>\n  <p>Additionally, wafer-level nanotopography\u2014slow, long-wavelength surface height variations across millimeter to centimeter spatial scales\u2014directly impacts gate oxide thickness uniformity and local planarity for contact alignment in leading-edge lithography steps. Nanotopography is introduced or inherited from the FSP process and cannot be fully corrected by downstream chemical amplification.<\/p>\n<\/section>\n\n<section id=\"specifications\">\n  <h2>2. Surface Quality Specifications for Prime and Epi-Ready Wafers<\/h2>\n  <p>The surface quality targets for final silicon polish are defined by multiple industry specifications, most commonly SEMI M1 (silicon prime wafer) and customer-specific specifications for epitaxial and SOI substrates:<\/p>\n  <div class=\"jcs-box\">\n    <div class=\"jcs-box-label\">Prime 300 mm Silicon Wafer FSP Specifications (Typical, August 2026)<\/div>\n    <ul>\n      <li><strong>Surface roughness (RMS)<\/strong>: &lt;0.10 nm over 1\u00d71 \u00b5m\u00b2 AFM scan; &lt;0.07 nm for leading-edge epitaxial substrates<\/li>\n      <li><strong>LPD count<\/strong>: &lt;50 particles at &gt;0.09 \u00b5m detection threshold (KLA SP5 or equivalent); &lt;20 LPD at &gt;0.12 \u00b5m for Class 1 applications<\/li>\n      <li><strong>Nanotopography (SFQR)<\/strong>: &lt;10 nm peak-to-valley over 10\u00d710 mm site; &lt;25 nm global (GBIR) across the full 300 mm wafer<\/li>\n      <li><strong>Haze<\/strong>: &lt;0.05 ppm (normalized to SiO\u2082 standard) measured by laser scatterometry<\/li>\n      <li><strong>Surface metal contamination<\/strong>: Fe &lt;5\u00d710\u00b9\u2070 atoms\/cm\u00b2; Cu &lt;1\u00d710\u00b9\u2070 atoms\/cm\u00b2; Ni &lt;5\u00d710\u00b9\u2070 atoms\/cm\u00b2<\/li>\n      <li><strong>Oxygen precipitates<\/strong>: Zero bulk microdefects (BMDs) in the top 10 \u00b5m (FEOL epitaxial grade)<\/li>\n    <\/ul>\n  <\/div>\n  <div class=\"jcs-note\">\n    <p><strong>Haze vs. roughness:<\/strong> Haze (measured by laser scatterometry at low incidence angles) and surface roughness (measured by AFM at nanometer spatial scales) capture different aspects of the surface quality but are strongly correlated. High roughness at the 1\u201310 nm spatial frequency range produces elevated haze. Final polish slurry selection must target both metrics simultaneously.<\/p>\n  <\/div>\n<\/section>\n\n<section id=\"slurry-design\">\n  <h2>3. Slurry Design for Sub-\u00c5ngstr\u00f6m Surface Quality<\/h2>\n  <p>Achieving sub-\u00e5ngstr\u00f6m surface roughness with colloidal silica requires slurry design that optimizes four interdependent variables simultaneously: particle size, pH, solids content, and additive chemistry.<\/p>\n  <h3>3.1 Particle Size: The Primary Roughness Lever<\/h3>\n  <p>For final silicon polish, the D50 must be in the range of 20\u201340 nm. At this size, the individual abrasive\u2013substrate contact area is small enough that each removal event removes only a few atomic layers of silicon, producing an atomically smooth surface. Larger particles (D50 &gt;60 nm) produce deeper individual contact events that translate to higher roughness contributions\u2014each particle leaves a slightly deeper &#8220;divot&#8221; in the hydrated surface layer, increasing the RMS roughness of the final polished surface.<\/p>\n  <p>The D90 must be tightly controlled: D90\/D50 ratio \u22642.0 ensures that the 10% of particles above the median are not significantly larger than the median, preventing the &#8220;tail&#8221; particles from contributing disproportionately to roughness and LPD. The large particle count (LPC) at &gt;0.5 \u00b5m must be below 300 particles\/mL (ideally &lt;100) to meet LPD specifications below 50 at &gt;0.09 \u00b5m detection.<\/p>\n  <div class=\"jcs-link-box\">\n    <span class=\"jcs-link-box-icon\">\u2192<\/span>\n    <span>For a quantitative analysis of how D50, D90, and LPC each affect surface roughness, haze, and LPD outcomes: <a href=\"https:\/\/jeez-semicon.com\/ja\/blog\/Colloidal-Silica-Particle-Size-How-Abrasive-Diameter-Drives-MRR-Selectivity-and-Scratch-Risk\/\" target=\"_blank\" rel=\"noopener noreferrer\">Colloidal Silica Particle Size: How Abrasive Diameter Drives MRR, Selectivity, and Scratch Risk<\/a><\/span>\n  <\/div>\n  <h3>3.2 pH: Balancing MRR, Roughness, and Haze<\/h3>\n  <p>Final silicon polish slurries typically operate at pH 10.5\u201312.0. The optimal pH represents a careful trade-off: higher pH accelerates Si surface hydration and increases MRR, but also increases the chemical etching rate of the silicon surface, which can increase surface haze if the chemical removal component outpaces the mechanical smoothing. Most final polish processes use pH 10.5\u201311.5 for prime wafer applications, with higher pH (11.0\u201312.0) reserved for epi-substrate preparation where higher Si removal is needed to eliminate sub-surface damage from preceding rough polish steps.<\/p>\n  <h3>3.3 Additive Chemistry<\/h3>\n  <p>Final silicon polish slurries frequently include small concentrations of surface-active additives that modify the silicon surface during polishing. Key additive types include:<\/p>\n  <ul>\n    <li><strong>Quaternary ammonium compounds (QAC)<\/strong>: Such as TMAH or choline, enhance silicon dissolution rate at alkaline pH by complexing Si dissolution products, preventing re-deposition on the surface<\/li>\n    <li><strong>Non-ionic surfactants<\/strong>: Reduce haze by modifying the surface wetting characteristics after polishing, promoting more uniform re-passivation of the silicon surface with oxide<\/li>\n    <li><strong>\u30ad\u30ec\u30fc\u30c8\u5264<\/strong>: Such as EDTA or citric acid, sequester trace metal ions (Fe\u00b3\u207a, Cu\u00b2\u207a) in solution to prevent them from depositing on the polished silicon surface as metal contamination<\/li>\n  <\/ul>\n<\/section>\n\n<section id=\"process-parameters\">\n  <h2>4. Process Parameters and Pad Selection<\/h2>\n  <p>Final silicon polish process conditions differ significantly from oxide CMP conditions\u2014lower pressures, softer pads, and gentler conditioning are the norm:<\/p>\n  <div class=\"jcs-table-wrap\">\n    <table>\n      <thead><tr><th>\u30d1\u30e9\u30e1\u30fc\u30bf<\/th><th>Typical Oxide CMP<\/th><th>Final Silicon Polish<\/th><th>Reason for Difference<\/th><\/tr><\/thead>\n      <tbody>\n        <tr><td>Down-force (pressure)<\/td><td>2\u20134 psi<\/td><td>0.5\u20132.0 psi<\/td><td>Lower stress to prevent sub-surface damage<\/td><\/tr>\n        <tr><td>Table speed<\/td><td>60\u2013120 rpm<\/td><td>30\u201380 rpm<\/td><td>Lower velocity reduces shear-induced roughness<\/td><\/tr>\n        <tr><td>Pad type<\/td><td>IC1000 (hard)<\/td><td>Suba or Politex (soft)<\/td><td>Soft pad conforms to surface, smooths micro-roughness<\/td><\/tr>\n        <tr><td>Conditioner<\/td><td>Diamond dresser (aggressive)<\/td><td>Soft conditioner or brush<\/td><td>Minimize pad debris; avoid hard conditioning particles<\/td><\/tr>\n        <tr><td>Slurry flow rate<\/td><td>150\u2013300 mL\/min<\/td><td>100\u2013200 mL\/min<\/td><td>Less slurry needed at lower MRR; reduces waste<\/td><\/tr>\n        <tr><td>Polish time<\/td><td>60\u2013180 s<\/td><td>120\u2013600 s<\/td><td>Lower MRR requires longer time; achieves gradual roughness reduction<\/td><\/tr>\n      <\/tbody>\n    <\/table>\n  <\/div>\n  <p>Soft CMP pads (Suba series, Politex) are preferred for final silicon polish because their low elastic modulus allows them to conform to the sub-nanometer topography of the wafer surface, providing more uniform abrasive contact across the full wafer area. Hard pads (IC1000) maintain better planarity for oxide step-height reduction but do not smooth roughness as effectively at the angstrom scale.<\/p>\n<\/section>\n\n<section id=\"multi-step\">\n  <h2>5. Multi-Step Polish Sequences<\/h2>\n  <p>Industrial final silicon polish is typically a multi-step process, not a single CMP step. The number and nature of steps depend on the upstream wafer condition (saw-damage depth, lapping roughness) and the final specification target:<\/p>\n  <ul>\n    <li><strong>Step 1 \u2014 Stock removal (SR) polish<\/strong>: Uses a larger D50 colloidal silica (60\u2013100 nm) or ceria-based slurry at higher pressure (2\u20134 psi) to rapidly remove 5\u201320 \u00b5m of silicon and eliminate all saw damage and sub-surface crystal defects. Surface roughness after SR polish: 0.3\u20131.0 nm RMS.<\/li>\n    <li><strong>Step 2 \u2014 Intermediate finish (IF) polish<\/strong>: Uses a medium D50 colloidal silica (40\u201360 nm) at moderate pressure (1.0\u20132.5 psi) to reduce roughness from 0.3\u20131.0 nm to 0.15\u20130.30 nm RMS while removing 0.5\u20132 \u00b5m of silicon.<\/li>\n    <li><strong>Step 3 \u2014 Final polish (FP)<\/strong>: Uses fine colloidal silica (D50 = 20\u201335 nm) at low pressure (0.5\u20131.5 psi) on a soft pad to bring roughness from 0.15\u20130.30 nm to the final target (&lt;0.10 nm RMS). Removes 50\u2013200 nm of silicon. This is the step where LPD generation is most critical and slurry cleanliness specifications are most stringent.<\/li>\n  <\/ul>\n  <p>The transition between steps typically includes a DI water rinse to prevent contamination of the subsequent step&#8217;s slurry with residues from the preceding step\u2014particularly important when transitioning from higher-MRR slurry in Step 1 to the ultra-clean final polish slurry in Step 3.<\/p>\n<\/section>\n\n<section id=\"post-cmp-clean\">\n  <h2>6. Post-CMP Clean Compatibility<\/h2>\n  <p>After final silicon polish, the wafer undergoes a post-CMP clean sequence designed to remove slurry particle residues, metallic contamination, and organic additive residues without damaging the freshly polished surface. The effectiveness of the post-CMP clean directly impacts the final LPD count and surface metal contamination\u2014often the binding specifications for prime wafer acceptance.<\/p>\n  <p>Standard post-CMP clean sequences for silicon final polish include:<\/p>\n  <ul>\n    <li><strong>Brush scrub with dilute NH\u2084OH\/H\u2082O\u2082 (SC1-equivalent)<\/strong>: Removes colloidal silica particle residues through a combination of mechanical scrubbing and chemical etching of the silicon surface beneath particle contact points. SC1 at 0.5\u20131% NH\u2084OH, 0.5\u20131% H\u2082O\u2082, 50\u00b0C for 60\u2013120 s is a common process.<\/li>\n    <li><strong>Dilute HF rinse<\/strong>: Strips the native oxide grown during SC1, removing oxide-trapped metal contaminants and leaving a hydrogen-terminated silicon surface with minimal particle adhesion<\/li>\n    <li><strong>Final DI water rinse with Marangoni drying<\/strong>: Marangoni (IPA-assisted) drying minimizes water-mark defects on the polished surface by using IPA vapor to create a surface-tension gradient that pulls the water film off cleanly<\/li>\n  <\/ul>\n  <p>The key compatibility requirement between the final polish slurry and the post-CMP clean is <strong>particle de-adhesion<\/strong>: colloidal silica particles must not form strong chemical bonds with the silicon surface during polishing that resist removal by brush scrub and SC1 chemistry. Well-formulated final polish slurries include pH adjusters and additive packages that prevent strong silica-silicon condensation bonds from forming at the particle\u2013substrate interface.<\/p>\n  <div class=\"jcs-link-box\">\n    <span class=\"jcs-link-box-icon\">\u2192<\/span>\n    <span>For detailed guidance on defect root-cause analysis post-FSP and post-CMP clean integration troubleshooting: <a href=\"https:\/\/jeez-semicon.com\/ja\/blog\/Defect-Control-in-Colloidal-Silica-CMP-Minimizing-Scratches-LPDs-and-Particle-Contamination\/\" target=\"_blank\" rel=\"noopener noreferrer\">Defect Control in Colloidal Silica CMP: Minimizing Scratches, LPDs, and Particle Contamination<\/a><\/span>\n  <\/div>\n<\/section>\n\n<section id=\"failure-modes\">\n  <h2>7. Common Failure Modes and Root Causes<\/h2>\n  <div class=\"jcs-table-wrap\">\n    <table>\n      <thead><tr><th>\u6545\u969c\u30e2\u30fc\u30c9<\/th><th>\u75c7\u72b6<\/th><th>\u6700\u3082\u8003\u3048\u3089\u308c\u308b\u6839\u672c\u539f\u56e0<\/th><th>\u662f\u6b63\u63aa\u7f6e<\/th><\/tr><\/thead>\n      <tbody>\n        <tr><td>High LPD count<\/td><td>LPD &gt; spec at &gt;0.09 \u00b5m after clean<\/td><td>LPC spike in slurry (agglomeration event); insufficient post-CMP clean; pad debris<\/td><td>Verify slurry pH and LPC; review dilution water quality; optimize clean chemistry<\/td><\/tr>\n        <tr><td>High surface roughness (haze)<\/td><td>RMS &gt;0.10 nm; haze &gt;0.05 ppm<\/td><td>D50 too large; pH too high (excessive chemical etching); polish time too short<\/td><td>Reduce D50; lower pH to 10.5; extend final polish step time<\/td><\/tr>\n        <tr><td>Nanotopography excursion<\/td><td>SFQR or GBIR out of spec<\/td><td>Pad thickness non-uniformity; carrier membrane pressure map issue; incoming wafer nanotopography<\/td><td>Pad qualification; carrier membrane inspection; review rough polish sequence<\/td><\/tr>\n        <tr><td>Scratch defects<\/td><td>Visible scratches on KLA review<\/td><td>Large particle tail in final polish slurry; pad conditioner debris; cross-contamination from SR step<\/td><td>Verify LPC by SPOS; add POF filter; review rinse protocol between steps<\/td><\/tr>\n        <tr><td>\u91d1\u5c5e\u6c5a\u67d3<\/td><td>Fe or Cu above spec by TXRF<\/td><td>Slurry metallic impurity; process water contamination; equipment surface contamination<\/td><td>Verify slurry CoA for Fe\/Cu; audit process water; inspect tool surfaces<\/td><\/tr>\n      <\/tbody>\n    <\/table>\n  <\/div>\n<\/section>\n\n<section id=\"jeez-cs20\">\n  <h2>8. JEEZ CS-20 Series for Final Silicon Polish<\/h2>\n  <p>The JEEZ CS-20 Series is specifically engineered for final silicon polish applications requiring sub-\u00e5ngstr\u00f6m surface roughness and ultra-low LPD counts. Key specifications: D50 = 20\u201330 nm, D90 &lt;60 nm, LPC &lt;300 counts\/mL at &gt;0.5 \u00b5m by SPOS, pH 10.0\u201311.5 (NH\u2084OH or KOH adjusted, customer-specified), solids content 12.5 wt% RTU or 25 wt% concentrate.<\/p>\n  <p>Each lot is released with a full Certificate of Analysis including SPOS-measured LPC data. JEEZ application engineering team provides process integration guidance, dilution protocol recommendations, and technical support for qualification at customer tools.<\/p>\n  <p>For the complete colloidal silica technical reference, see: <a href=\"https:\/\/jeez-semicon.com\/ja\/blog\/Colloidal-Silica-Slurry-The-Complete-Guide-to-CMP-Applications-Properties-and-Selection\/\" target=\"_blank\" rel=\"noopener noreferrer\">Colloidal Silica Slurry: The Complete Guide to CMP Applications, Properties, and Selection<\/a>.<\/p>\n<\/section>\n\n<section id=\"faq\">\n  <h2>9. Frequently Asked Questions<\/h2>\n  <div class=\"jcs-faq-item\">\n    <div class=\"jcs-faq-q\">What D50 particle size should I use for final silicon polish?<\/div>\n    <div class=\"jcs-faq-a\"><p>For prime silicon wafer final polish targeting surface roughness &lt;0.10 nm RMS and LPD &lt;50 at &gt;0.09 \u00b5m, use D50 = 20\u201330 nm. For epi-substrate preparation where slightly higher MRR is acceptable and the roughness target is &lt;0.15 nm RMS, D50 = 30\u201340 nm provides a better throughput-quality balance. Do not use D50 &gt;50 nm for final polish\u2014the roughness and haze penalties are significant and typically exceed specification limits.<\/p><\/div>\n  <\/div>\n  <div class=\"jcs-faq-item\">\n    <div class=\"jcs-faq-q\">Why is the material removal rate so low in final silicon polish?<\/div>\n    <div class=\"jcs-faq-a\"><p>Final silicon polish intentionally uses conditions that minimize MRR to maximize surface quality: fine particles (20\u201330 nm D50), low pressure (0.5\u20131.5 psi), moderate velocity, and soft pads. The MRR under these conditions is typically 100\u2013400 \u00c5\/min\u2014much lower than oxide CMP (500\u20133,500 \u00c5\/min). The low MRR is a feature, not a bug: each removal event removes fewer atoms, producing a smoother final surface. The trade-off is longer polish times (120\u2013600 seconds), which is acceptable for prime silicon wafer manufacturing where throughput is less constrained than in device fabrication CMP steps.<\/p><\/div>\n  <\/div>\n  <div class=\"jcs-faq-item\">\n    <div class=\"jcs-faq-q\">Can I use an alkaline colloidal silica slurry with KOH for final silicon polish?<\/div>\n    <div class=\"jcs-faq-a\"><p>Yes, KOH-adjusted colloidal silica is used in final silicon polish, but the K\u207a contamination implications must be managed. After FSP with KOH-adjusted slurry, the post-CMP clean sequence (SC1 + dilute HF + DI rinse) must achieve K\u207a surface concentration below the incoming wafer specification\u2014typically &lt;1\u00d710\u00b9\u2070 atoms\/cm\u00b2. If your post-CMP clean is effective, KOH-adjusted slurry is suitable. If K\u207a specifications are extremely tight (e.g., for gate-oxide-proximate FEOL process compatibility), specify NH\u2084OH-adjusted or TMAH-adjusted colloidal silica to eliminate K\u207a introduction entirely.<\/p><\/div>\n  <\/div>\n  <div class=\"jcs-faq-item\">\n    <div class=\"jcs-faq-q\">How does nanotopography relate to the final polish process?<\/div>\n    <div class=\"jcs-faq-a\"><p>Nanotopography\u2014slow-wavelength surface height variation at 0.2\u201320 mm spatial scales\u2014is primarily inherited from upstream mechanical processing (wire sawing, lapping) and is reduced but not eliminated by the CMP polish sequence. The FSP process influences nanotopography through pad stiffness (softer pads conform to and reduce shorter-wavelength nanotopography but have less effect on longer-wavelength components), carrier head pressure uniformity, and wafer holder backpressure distribution. Tight nanotopography specifications (&lt;8 nm SFQR over 10\u00d710 mm) require optimization of the full polish sequence, including the intermediate polish steps, not just the final polish step.<\/p><\/div>\n  <\/div>\n<\/section>\n\n<div class=\"jcs-cta\">\n  <h2>Achieve Sub-\u00c5ngstr\u00f6m Silicon Polish with JEEZ CS-20<\/h2>\n  <p>Request a sample of JEEZ CS-20 Series final polish slurry for evaluation against your prime wafer LPD and roughness specifications. Our application engineering team can provide a tailored qualification protocol and process integration support.<\/p>\n  <a href=\"https:\/\/jeez-semicon.com\/ja\/contact\/\" class=\"jcs-cta-btn\" target=\"_blank\" rel=\"noopener noreferrer\">Request Sample &amp; Technical Support \u2192<\/a>\n<\/div>\n\n<hr class=\"jcs-hr\">\n<p class=\"jcs-footnote\">Published by <strong>Jizhi Electronic Technology Co., Ltd. (JEEZ)<\/strong> \u00b7 August 2026. For process-specific advice, <a href=\"https:\/\/jeez-semicon.com\/ja\/contact\/\" target=\"_blank\" rel=\"noopener noreferrer\">contact our application engineering team<\/a>.<\/p>\n<\/article>\n\n<script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What D50 particle size should I use for final silicon polish?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"For prime silicon wafer final polish targeting less than 0.10 nm RMS and LPD less than 50 at greater than 0.09 um, use D50 = 20\u201330 nm. For epi-substrate preparation with slightly looser roughness target (less than 0.15 nm), D50 = 30\u201340 nm offers better throughput. Do not use D50 greater than 50 nm for final polish.\"}},{\"@type\":\"Question\",\"name\":\"Why is the material removal rate so low in final silicon polish?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Final silicon polish intentionally uses fine particles (20\u201330 nm D50), low pressure (0.5\u20131.5 psi), and soft pads to minimize MRR (100\u2013400 A\/min). Low MRR produces a smoother surface because each removal event removes fewer atoms. Longer polish times (120\u2013600 s) are the trade-off and are acceptable in prime wafer manufacturing.\"}},{\"@type\":\"Question\",\"name\":\"Can I use a KOH-adjusted colloidal silica slurry for final silicon polish?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, provided the post-CMP clean (SC1 + dilute HF + DI rinse) reduces K+ surface concentration below spec (typically less than 1e10 atoms\/cm2). For extremely tight K+ specifications near gate dielectric steps, specify NH4OH- or TMAH-adjusted slurry to eliminate K+ introduction.\"}},{\"@type\":\"Question\",\"name\":\"How does nanotopography relate to the final polish process?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Nanotopography is primarily inherited from upstream mechanical processing and is reduced but not eliminated by CMP. Final polish influences it through pad stiffness, carrier head pressure uniformity, and backpressure distribution. Tight nanotopography specs require optimizing the full polish sequence, not just the final step.\"}}]}\n<\/script>","protected":false},"excerpt":{"rendered":"<p>Application Guide \u00b7 Cluster C-04 A comprehensive technical guide to final silicon polish (FSP) with colloidal silica CMP slurry\u2014covering surface quality specifications, slurry design principles, process parameter optimization, multi-step polish  &#8230;<\/p>","protected":false},"author":1,"featured_media":2595,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[9,59],"tags":[],"class_list":["post-2592","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\/2592","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=2592"}],"version-history":[{"count":2,"href":"https:\/\/jeez-semicon.com\/ja\/wp-json\/wp\/v2\/posts\/2592\/revisions"}],"predecessor-version":[{"id":2594,"href":"https:\/\/jeez-semicon.com\/ja\/wp-json\/wp\/v2\/posts\/2592\/revisions\/2594"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/jeez-semicon.com\/ja\/wp-json\/wp\/v2\/media\/2595"}],"wp:attachment":[{"href":"https:\/\/jeez-semicon.com\/ja\/wp-json\/wp\/v2\/media?parent=2592"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jeez-semicon.com\/ja\/wp-json\/wp\/v2\/categories?post=2592"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jeez-semicon.com\/ja\/wp-json\/wp\/v2\/tags?post=2592"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}