robot (wafer handling)

Wafer handling robots are precision automated arms that pick and place wafers in semiconductor processing tools. **Purpose**: Transfer wafers between pods, aligners, load locks, and chambers without damage or contamination. **End effector**: The blade or paddle that contacts wafer. Edge grip, vacuum, Bernoulli, or electrostatic types. Minimal contact area. **Materials**: End effectors from ceramic, PEEK, quartz, or other clean materials compatible with process environment. **Motion axes**: Typically SCARA (Selective Compliance Articulated Robot Arm), R-Theta, or linear. 3-6 axes of motion. **Precision**: Sub-millimeter placement accuracy. Repeatable positioning essential. **Clean handling**: Robots designed for cleanroom - minimal particle generation, sealed bearings, clean lubricants. **Speed**: Optimize for throughput while maintaining precision and avoiding wafer damage. **Vacuum robots**: Robots in vacuum chambers (transfer chambers) for vacuum-compatible handling. **Atmospheric robots**: In EFEM, operate in clean air or N2 environment. **Safety**: Collision avoidance, interlock systems, controlled motion profiles.