Patent ID: 6087232
Filing Date: 2000-07-11
Classification: H01L

Abstract:
A method for manufacturing a double RESURF (Reduced SURface Field) LDMOS (Lateral Double-diffused Metal Oxide Semiconductor) devices, said method comprising the steps of:(a) forming a drift region of a second conductive type in an epitaxial layer of a first conductive type having a silicon substrate of a same conductive type;(b) sequentially forming a pad oxide and a nitride pattern;(c) forming a field oxide and a convex region underlying the nitride pattern using an LOCOS (local oxidation) process used the nitride pattern as a mask, and removing the nitride pattern;(d) forming a tapered top layer of the first conductive type on the surface of said drift region using said field oxide as an ion-implanting mask;(e) forming a TEOS oxide pattern of multi-layer structure using a chemical vapor deposition (CVD) method for exposing the portion of said epitaxial layer, said drift region and said top layer; and(f) forming a gate electrode and source/drain regions.