Patent ID: 11967497
Assignee: ACM RESEARCH (SHANGHAI) INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  B  G | IPC B  G  H

Claim 0:
1. A method for cleaning a semiconductor wafer comprising features of patterned structures, the method comprising:
applying liquid on the semiconductor wafer;
controlling, based on a timer, a power supply of a transducer to deliver acoustic energy to the liquid at a first frequency and a first power level for a predetermined first time period; and
controlling, based on the timer, the power supply of the transducer to deliver no acoustic energy to the liquid for a predetermined second time period, wherein the first and second time periods are alternately applied one after another for a predetermined number of cycles;
detecting a power on time of the power supply; and
shutting down the power supply when the power on time exceeds a first preset value.