Patent ID: 6194257
Filing Date: 2001-02-27
Classification: H01L

Abstract:
A method of fabricating a gate electrode having dual gate insulating films comprising the steps of:providing a substrate having a first portion and a second portion;forming a first insulating film on the substrate and a second insulating film on the first insulating film;removing the second insulating film corresponding to the first portion to expose the first insulating film;forming a third insulating film by oxidizing the second portion of the substrate;removing the first, the second, and the third insulating films to form a step in the substrate between the first portion and the second portion;forming a fourth insulating film on the first portion of the substrate, a first conductive film on the fourth insulating film and a fifth insulating film on the first conductive film;forming a resist film on the first portion of the substrate;removing the fourth insulating film, the first conductive film, and the fifth insulating film on the second portion of the substrate;forming a sixth insulating film on the second portion of the substrate;forming a second conductive film on the fifth and the sixth insulating films;etching the second conductive film to expose the first conductive film on the first portion and the second conductive film on the second portion; andpatterning the first and the second conductive films to form a gate electrode,wherein no field oxide region is formed between portions of the first and second conductive films remaining after patterning.