Patent ID: 8084340
Filing Date: 2011-12-27
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device comprising: forming, over a semiconductor substrate, a photoresist; exposing the photoresist to form a photoresist pattern with an opening; implanting first impurities into the semiconductor substrate by using the photoresist pattern as a mask, to form a first well in the semiconductor substrate; removing the photoresist pattern; growing an epitaxial layer on the semiconductor substrate after the first well is formed and the photoresist pattern is removed; forming an isolation region after the epitaxial layer is grown; after the forming of the isolation region, implanting second impurities into the epitaxial layer to form a second well; after the forming of the second well, forming a gate oxide film over the epitaxial layer; forming a polysilicon gate over the gate oxide film; and implanting third impurities into the epitaxial layer using the polysilicon gate as a mask to form a source region and a drain region.