Conductive TiO₂ ceramic end-effectors for mitigating particle contamination in PECVD wafer handling

Electrostatic charge accumulation on insulating ceramic end-effectors during vacuum wafer transfer represents a persistent and unresolved challenge in advanced semiconductor manufacturing. At technology nodes of 14 nm and below, even a few tens of particles can cause fatal yield loss. Here we report a practical engineering solution based on bulk material substitution: replacing conventional insulating Al₂O₃ end-effectors with conductive TiO₂-based ceramics. On a production-scale PECVD platform, the TiO₂ end-effector exhibits an ∼80% lower post-process surface potential, corresponding to a 24-fold reduction in electrostatic adhesion force. Wafer-level particle adders during robotic transfer are reduced by > 90% for particles ≥ 0.026 μm in lab tools. Particle composition analysis detects no Ti signal on wafers handled by the TiO₂ end-effector, confirming that the reduction originates from charge dissipation rather than wear debris. Ti 2p and O 1 s XPS spectra reveal features consistent with oxygen vacancies as reported for conductive reduced TiO₂. The solution has been validated in high-volume manufacturing with over one million wafer transfers across 15 production tools, achieving a sustained reduction in average particle counts from 4.06 to 2.5 per wafer. This work offers a drop‑in, cost‑neutral material strategy that requires no hardware or process modification, directly addressing a critical contamination bottleneck in 14 nm node and beyond.