Patent ID: 6218229
Filing Date: 2001-04-17
Classification: H01L

Abstract:
A method of fabricating a semiconductor device having a dual-gate, comprising the steps of:providing a semiconductor substrate with a gate insulating film formed on a first portion and a second portion of the semiconductor substrate and a polysilicon layer formed on the gate insulating film, a first dopant of a first conductive type being implanted in the polysilicon layer covering the first portion and a second dopant of a second conductive type being implanted in the polysilicon layer covering the second portion;first selectively etching the polysilicon layer covering the first portion using a first mask to form a first gate;first selectively implanting a third dopant of the first conductive type using the first mask, to form first impurity regions on both sides of the first gate;second selectively etching the polysilicon layer covering the second portion using a second mask to form a second gate; andsecond selectively implanting a fourth dopant of the second conductive type using the second mask, to form second impurity regions on both sides of the second gate.