Patent ID: 7685667
Filing Date: 2010-03-30
Classification: B08B,G01P,H01L

Abstract:
1. A system for cleaning a wafer after chemical mechanical polish comprising: a brush module having at least two brushes arranged adjacent to each other for placing the wafer in between; and a dummy roller for contacting an edge of the wafer and following a rotation of the wafer, wherein when the wafer is rotated, the brushes clean both sides of the wafer, and the dummy roller is configured to detect a rotation speed and a rotation direction of the wafer for further adjusting the rotation of the wafer, the dummy roller further providing feedback so that the wafer rotation status can be measured in real time, and wherein the dummy roller comprises a set of high-speed bearings for accurate measurement of the rotation speed of the wafer by minimizing a start torque of the dummy roller.