Patent ID: 7192834
Filing Date: 2007-03-20
Classification: H01L

Abstract:
1. A method of fabricating a lateral double diffused metal oxide semiconductor (LDMOS) device, comprising the steps of: (a) providing a substrate of a first conductivity type; (b) forming within the substrate a well region of a second conductivity type, the well region having a super steep retrograde (SSR) well profile in which a doping concentration changes with depth so as to provide a lighter doping concentration in a surface region of the well region than in a region below the surface region of the well region; (c) forming a gate layer which partly overlies the a portion of the substrate of the first conductivity type adjacent to the well region, said portion including a channel for the LDMOS device, and partly overlies the well region and is insulated from the well region; and (d) forming one of a source region and a drain region in the well region, and the other of the source region and the drain region in said portion of the substrate.