Hi Li, We bake our samples on a hot plate for 5 min at 110 deg C. after the USB clean. Then we let it cool for about 2 min. before we spin on the PR. Tony On Tue, Mar 9, 2010 at 9:33 PM, Li. Zhangwrote: > Hi Tony, > > Thanks for your suggestion. It is very helpful and I'm gonna try on it. > I have one more small question. Do you bake the wafer piece after USB in > methanol or you just directly spin adhesion promoter or PR after this step? > > Thanks, > > Li. Zhang -- Tony Price Department of Electrical Engineering University of South Florida 4202 E. Fowler Avenue, ENB-118, Tampa, FL, 33620 Office: ENB 412 Phone: (813) 974-4851 Cell: (404) 291-3506