Patent ID: 7344998
Filing Date: 2008-03-18
Classification: C23F,H01L

Abstract:
1. A wafer-recovering method, comprising: providing a first wafer, wherein said first wafer has a base, a first conductive layer on said base, and a second conductive layer on said first conductive layer; removing said first and second conductive layers with an acidic solution to obtain a second wafer; and washing said second wafer with a liquid, wherein said second conductive layer is formed on said first conductive layer in a deposition process, and said first conductive layer is more easily removed by said acidic solution than said second conductive layer, so that after said second conductive layer is removed along with said first conductive layer by said acidic solution, the base of the second wafer is characterized by a particulate contamination count, the particulate contamination count being lower than a predefined particulate contamination count.