Patent ID: 6773995
Filing Date: 2004-08-10
Classification: H01L

Abstract:
A method of manufacturing a double-diffused metal oxide semiconductor (DMOS) transistor, comprising the steps of:(a) forming a buried layer containing impurity ions of a second conductivity type in a semiconductor substrate containing impurity ions of a first conductivity type; (b) forming isolation trenches in the buried layer and the semiconductor substrate; (c) forming an isolation layer in the isolation trenches; (d) growing an epitaxial layer containing impurity ions of the second conductivity type on the buried layer and the isolation layer; (e) forming drain trenches in the isolation layer; (f) forming a dielectric spacer on sidewalls of the drain trenches; (g) forming plug-type drains containing impurity ions of the second conductivity type on the dielectric spacer within the drain trenches; and (h) forming gates and source areas on a resultant structure containing the plug-type drains.