Hi All, I am working with the wet etch of GaAs in citric acid:Hydrogen peroxide::5:1. I am facing the problem that Electrode deposited as Au/Ni/Ge/Au layers start delaminated after 55-60 mintues of etching. However if we anneal the sample for 30 mintues at the 150 degree calcious, the effect is less. Any comment will be appericiated Thx Kumar Maryland MEMS Lab University of Maryland College Park-MD 20742 Tel 301-405-0364 __________________________________________________ Do You Yahoo!? Yahoo! Finance - Get real-time stock quotes http://finance.yahoo.com