Patent ID: 8455324
Filing Date: 2013-06-04
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, comprising: forming a gate insulating film over a first semiconductor layer; forming a gate electrode over the gate insulating film; forming an insulating film over the first semiconductor layer and the gate electrode; etching the insulating film and exposing the first semiconductor layer to form a sidewall spacer on the sidewall of the gate electrode; etching the first semiconductor layer to form a first recess in the first semiconductor layer on both sides of the gate electrode by dry etching using the gate electrode and the sidewall spacer as masks; forming a second recess by removing a bottom and sidewalls of the first semiconductor layer in the first recess by wet etching; and forming a second semiconductor layer in the second recess; wherein the wet etching is performed using an etchant containing an oxidizing agent for oxidizing the first semiconductor layer and an inorganic alkali; wherein forming the second semiconductor layer is performed by epitaxially growing the second semiconductor layer at a temperature of 450° C. to 600° C.