Patent ID: 11955328
Assignee: ACM RESEARCH (SHANGHAI) INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  B | IPC B  H

Claim 0:
1. A method for cleaning wafer, comprising:
partially filling a first cleaning tank and a second cleaning tank with a chemical solution, wherein a height of liquid level of the first cleaning tank is lower than the height of liquid level of the second cleaning tank, the first cleaning tank and the second cleaning tank are divided by a divider between the first cleaning tank and the second cleaning tank;
putting at least one wafer on a cassette bracket in the first cleaning tank;
after the at least one wafer have been processed in the first cleaning tank, transferring the at least one wafer from the first cleaning tank to the second cleaning tank on another cassette bracket for holding the at least one wafer with the at least one wafer immersing in the chemical solution;
the chemical solution in the second cleaning tank flows to the first cleaning tank through a slot provided on the divider while transferring the at least one wafer from the first cleaning tank to the second cleaning tank;
after the at least one wafer have been processed in the second cleaning tank, taking the at least one wafer out of the second cleaning tank; and
wherein the step of transferring the at least one wafer from the first cleaning tank to the second cleaning tank with the at least one wafer immersing in the chemical solution comprises, transferring the at least one wafer from the first cleaning tank to the second cleaning tank through the slot provided on the divider.