multi-chamber tool

Multi-chamber tools contain multiple process chambers on a single platform, enabling sequential processing steps without breaking vacuum and increasing throughput. Architecture: central handler (vacuum transfer chamber) with multiple process chambers attached radially, plus load locks for wafer entry/exit. Benefits: (1) Reduced contamination—wafers stay in vacuum between steps; (2) Improved process control—no queue time variation between steps; (3) Space efficiency—multiple chambers share handler, power, facilities; (4) Higher throughput—parallel processing in different chambers. Configuration examples: (1) Etch cluster—multiple etch chambers (can be different process types); (2) PVD cluster—degas + preclean + multiple metal deposition chambers; (3) CVD cluster—clean + multiple deposition chambers; (4) ALD cluster—multiple ALD chambers for throughput. Scheduling complexity: optimize wafer routing through chambers to maximize utilization while meeting process constraints (queue time limits, dedicated chambers). Maintenance considerations: individual chamber PM affects overall tool availability—design for minimum reconfiguration time. Extensibility: add or reconfigure chambers for process changes. Queue time sensitive processes (e.g., gate stack) particularly benefit from integrated processing. Capacity analysis: model each chamber's contribution to overall tool throughput. Modern fab workhorse—most critical process tools use cluster architecture for advanced manufacturing flexibility and control.