RCA clean is used to remove organic residues from silicon wafers. In the process, it
oxidizes the silicon and leaves a thin oxide on the surface of the wafer. The general
recipe is for RCA-1 cleanser is: 5 parts water (H2O), 1 part 27% ammonium hydroxide
(NH4oH), 1 part 30%hydrogen peroxide (H2O2). Here is how to prepare it.