Patent ID: 6103562
Filing Date: 2000-08-15
Classification: H01L,Y10S

Abstract:
A method for fabricating a semiconductor device, comprising the steps of:(1) forming first, and second conductive type wells in prescribed regions of a substrate, respectively;(2) forming a first insulating film on the first, and second conductive type wells;(3) depositing an undoped semiconductor layer on the first insulating film;(4) injecting ions into the semiconductor layer on the first conductive type well, to form a second conductive type semiconductor layer;(5) injecting ions into the semiconductor layer on the second conductive type well, to form a first conductive type semiconductor layer;(6) forming a second insulating film of prescribed patterns on the first, and second conductive type semiconductor layers;(7) forming a first conductive type counter doping region on the second conductive type semiconductor layer under edges in a direction of a channel width and both sides of the second insulating film of the prescribed pattern on the second conductive type semiconductor layer;(8) forming a second conductive type counter doping region on the first conductive type semiconductor layer under edges in a direction of a channel width and both sides of the second insulating film of the prescribed pattern on the first conductive type semiconductor layer;(9) etching exposed portions of the first insulating film, and the first, and second counter doping regions using the second insulating film on the first, and second conductive wells as a mask to form first, and second gate electrodes, and the first, and second gate insulating films respectively, and etching exposed portions of the first, and second conductive type well to form trenches;(10) forming isolating and insulating films in the trenches; and,(11) removing the second insulating film.