Patent ID: 6362062
Filing Date: 2002-03-26
Classification: H01L

Abstract:
A method for forming a MOS transistor, comprising:providing a semiconductor substrate with an upper surface; forming a gate dielectric on said semiconductor substrate; forming a gate structure on said gate dielectric with a plurality of side surfaces and a top surface; forming a first insulator film of a first thickness on said plurality of side surfaces, said top surface, and said upper surface of said substrate; forming a plurality of sidewall structures against said first insulator film on said plurality of side surfaces wherein said sidewall structure covers a portion of said first insulator film over said upper surface of said substrate; forming a LOCOS type insulator film of a second thickness on said upper surface of said semiconductor substrate wherein said second thickness is greater than said first thickness and said LOCOS type insulator film is formed by thermal oxidation of said first insulator film.