Patent ID: 8153501
Filing Date: 2012-04-10
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device, comprising: forming a first conductive layer over a p-well of a silicon layer; forming a second conductive layer over an n-well of the silicon layer; implanting, after forming the second conductive layer, fluorine ions into both the p-well and the n-well; exposing, after implanting the fluorine ions, both the p-well and the n-well to ammonium hydroxide and peroxide; applying, after exposing the p-well and the n-well, a mixture of gaseous hydrofluoric (HF) acid and vaporous ammonia to the semiconductor device; and selectively epitaxially growing, after applying the mixture, a boron-doped silicon-germanium layer on the n-well of the silicon layer and not on the p-well of the silicon layer, wherein the epitaxial growing is performed without a mask.