Patent ID: 11911807
Assignee: ACM RESEARCH (SHANGHAI) INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC B  H | IPC B  H

Claim 9:
10. A method for cleaning substrates, comprising: placing a substrate on a substrate holder; implementing a pre-wetting process to form a bubble less or bubble-free liquid layer on the substrate, wherein the bubble less or bubble-free pre-wetting process comprises building a vacuum environment surrounding the substrate, and then supplying a pre-wetting chemical solution or a chemical mist onto the substrate; and implementing an ultra or mega sonic cleaning process for cleaning the substrate after the pre-wetting process, wherein the method further comprises using plasma to remove scums and burrs to obtain a smooth surface in recessed areas of the substrate prior to implementing the pre-wetting process for the substrate, and wherein the scums and burrs attract a bubble.