Patent ID: 6337248
Filing Date: 2002-01-08
Classification: H01L

Abstract:
A process for manufacturing a semiconductor device having a substrate and surface channel and buried channel insulated gate field effect transistors of a first conductive type and surface channel and buried channel insulated gate field effect transistors of a second conductive type formed on the substrate, comprising:forming a polycrystalline semiconductor layer on a substrate; introducing a dopant of said first conductive type prior to patterning said polycrystalline semiconductor layer forming respective gate electrodes of said surface channel insulated gate field effect transistor of said first conductive type and said buried channel insulated gate field effect transistor of said second conductive type; and introducing a dopant of said second conductive type prior to patterning said polycrystalline semiconductor layer forming respective gate electrodes of said surface channel insulated gate field effect transistor of said second conductive type and said buried channel insulated gate field effect transistor of said first conductive type.