Patent ID: 6039055
Filing Date: 2000-03-21
Classification: B08B,H01L,Y10S

Abstract:
A method for megasonic cleaning of wafers, the method comprising:(a) providing a container containing one or more wafers immersed in a first liquid,(b) providing a flow of second liquid to the container, the second liquid containing a controlled amount of dissolved gas,(c) directly monitoring the gas content of (i) the second liquid flowing to the container, (ii) the liquid in the container, and/or (iii) liquid leaving the container, and deriving a signal(s) corresponding to said monitored gas content(s),(d) providing said signal(s) to a controller, the controller being capable of adjusting the flow said second liquid to said container and/or gas content of the second liquid,(e) adjusting the flow of the second liquid to the container and/or gas content of the second liquid in response to the signal(s),(f) providing a source of megasonic energy and a controller for said source of megasonic energy, and transmitting said signal(s) to said controller for said source of megasonic energy, and(g) applying megasonic energy to the liquid in the container whereby the wafer(s) are cleaned.