Patent ID: 6033944
Filing Date: 2000-03-07
Classification: H01L

Abstract:
A method for manufacturing a semiconductor device, comprising the steps of:(a) forming a semiconductor film having a first area portion and a second area portion over a semiconductor substrate, wherein said first area portion is disposed over a first area of said semiconductor substrate and said second area portion is disposed over a second area of said semiconductor substrate;(b) providing a mask layer over said second area portion of said semiconductor film;(c) introducing impurities into said first area of said semiconductor substrate by using said mask layer as a mask to form a first well region in said first area of said semiconductor substrate;(d) changing a thickness of said first area portion of said semiconductor film by using said mask layer as a mask to produce a changed first area portion;(e) forming a first transistor over said first area of said semiconductor substrate, wherein said first transistor comprises a first conductive type gate electrode formed with at least some of said changed first area portion of said semiconductor film; and(f) forming a second transistor over said second area of said semiconductor substrate, wherein said second transistor comprises a second conductive type gate electrode formed with at least some of said second area portion of said semiconductor film.