wafer cleaning sink

Wafer cleaning sinks are dedicated wet benches with DI water supply for manual or semi-automated wafer rinsing operations. **Purpose**: Rinse wafers or cassettes after wet chemical processing. Remove chemical residues before next process step. **DI water supply**: Ultra-pure water with final point-of-use filtration. Continuous overflow to maintain purity. **Sink design**: Quartz or PFA material compatible with ultra-pure water. No metal contamination sources. **Cascade rinsing**: Multiple overflow tanks in series - wafers move through increasingly pure water. Efficient use of DI water. **Dump rinse**: Rapid fill and drain cycles for thorough rinsing. Quick dump capability. **Spray rinse**: Direct spray of DI water on wafers. Sometimes combined with megasonic for particle removal. **Resistivity monitoring**: In-situ monitors verify rinse completion when outlet resistivity approaches supply resistivity. **Quick drain quick fill (QDR)**: Rapid cycling for effective chemical displacement. **Integration**: Part of wet bench processing line, often automated with robotic wafer handling.