Patent ID: 9478444
Filing Date: 2016-10-25
CPC Classification: B08B,H01L

Claim Text:
1. A method for cleaning a wafer, comprising: cleaning a wafer by using a wafer scrubber having a sloping sidewall; cleaning the wafer scrubber in a scrubber cleaning module, wherein an ultrasonically agitated cleaning liquid is applied on the sloping sidewall of the wafer scrubber to clean the wafer scrubber, and the wafer scrubber is at least partially dipped in a second ultrasonically agitated cleaning liquid; repeatedly raising and lowering the wafer scrubber and simultaneously rotating the wafer scrubber during applying the ultrasonically agitated cleaning liquid on the sloping sidewall of the wafer scrubber and at least partially dipping the wafer scrubber in the second ultrasonically agitated cleaning liquid; simultaneously swinging the wafer scrubber in the second ultrasonically agitated cleaning liquid during the repeatedly raising, lowering, and rotating of the wafer scrubber; and cleaning the wafer or a second wafer by the wafer scrubber after the wafer scrubber is cleaned by the ultrasonically agitated cleaning liquid and the second ultrasonically agitated cleaning liquid.