\n| > 300 nm<\/td>\n | Gouging, line damage<\/td>\n | Critical<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n This relationship underpins the rationale for sub-micron filtration in advanced CMP processes.<\/p>\n <\/p>\n 5. CMP Slurry Filter Technologies<\/h2>\n5.1 Depth Filters<\/h3>\nDepth filters capture particles throughout the filter matrix and provide high dirt-holding capacity.<\/p>\n 5.2 Membrane Filters<\/h3>\nMembrane filters offer sharp cut-off characteristics and are preferred for final point-of-use (POU) filtration.<\/p>\n 5.3 Pleated Filters<\/h3>\nPleated designs increase surface area, reducing pressure drop and extending lifetime.<\/p>\n![\"Comparison](\"https:\/\/jeez-semicon.com\/wp-content\/uploads\/2026\/01\/Comparison-of-depth-membrane-and-pleated-filter-structures.webp\") Comparison of depth, membrane, and pleated filter structures.<\/figcaption><\/figure>\n<\/p>\n 6. Filter Pore Size Selection Strategy<\/h2>\n\n\n\n| Process Node<\/th>\n | Abrasive Size<\/th>\n | Recommended Pore Size<\/th>\n<\/tr>\n | \n| > 90 nm<\/td>\n | 100\u2013200 nm<\/td>\n | 1.0 \u00b5m<\/td>\n<\/tr>\n | \n| 45\u201328 nm<\/td>\n | 50\u2013100 nm<\/td>\n | 0.5 \u5fae\u7c73<\/td>\n<\/tr>\n | \n| < 14 nm<\/td>\n | 30-70 \u7eb3\u7c73<\/td>\n | 0.2 \u5fae\u7c73<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Over-filtration risks abrasive depletion, while under-filtration increases defectivity.<\/p>\n <\/p>\n 7. Chemical Compatibility & Slurry Stability<\/h2>\nFilter materials must remain chemically inert under slurry conditions:<\/p>\n \n- Oxidizers (H2<\/sub>O2<\/sub>, persulfates)<\/li>\n
- Low pH (metal CMP)<\/li>\n
- Chelating agents<\/li>\n<\/ul>\n
\n\n\n| Filter Material<\/th>\n | Chemical Compatibility<\/th>\n | Typical Use<\/th>\n<\/tr>\n | \n| \u805a\u56db\u6c1f\u4e59\u70ef<\/td>\n | \u4f18\u79c0<\/td>\n | \u91d1\u5c5e CMP<\/td>\n<\/tr>\n | \n| PVDF<\/td>\n | \u826f\u597d<\/td>\n | \u94dc\/\u74e6 CMP<\/td>\n<\/tr>\n | \n| \u5c3c\u9f99<\/td>\n | \u4e2d\u5ea6<\/td>\n | \u6c27\u5316\u7269 CMP<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n <\/p>\n 8. Experimental Data & Filtration Performance<\/h2>\n![\"Particle](\"https:\/\/jeez-semicon.com\/wp-content\/uploads\/2026\/01\/Particle-count-reduction-as-a-function-of-filter-pore-size-in-Cu-CMP-slurry.png\") Particle count reduction as a function of filter pore size in Cu CMP slurry.<\/figcaption><\/figure>\nExperimental data consistently show that sub-0.5 \u00b5m filtration reduces scratch density by over 70% in metal CMP processes.<\/p>\n <\/p>\n 9. Filtration Process Window<\/h2>\nCMP slurry filtration must operate within a narrow process window balancing:<\/p>\n \n- Particle removal efficiency<\/li>\n
- Pressure drop stability<\/li>\n
- Slurry lifetime<\/li>\n<\/ul>\n
![\"Trade-off](\"https:\/\/jeez-semicon.com\/wp-content\/uploads\/2026\/01\/Trade-off-between-pore-size-defectivity-and-slurry-lifetime.png\") Trade-off between pore size, defectivity, and slurry lifetime.<\/figcaption><\/figure>\n<\/p>\n 10. Integration with CMP Tools<\/h2>\nFiltration systems are typically integrated at:<\/p>\n \n- Bulk slurry supply<\/li>\n
- Recirculation loops<\/li>\n
- Point-of-use (POU)<\/li>\n<\/ul>\n
POU filtration provides the most direct defect control but requires frequent monitoring.<\/p>\n <\/p>\n 11. Filtration Failure Modes & Root Cause Analysis<\/h2>\n11.1 Rapid Pressure Drop Increase<\/h3>\nIndicates excessive particle loading or slurry instability.<\/p>\n 11.2 Sudden Scratch Excursion<\/h3>\nOften caused by filter rupture or bypass leakage.<\/p>\n 11.3 MRR Drift<\/h3>\nMay indicate over-filtration and abrasive depletion.<\/p>\n <\/p>\n 12. HVM Filtration Strategy<\/h2>\n | | |