Patent ID: 6140193
Filing Date: 2000-10-31
Classification: H01L

Abstract:
A method for forming a semiconductor device, comprising:providing a semiconductor substrate having a first conductivity type;forming a blocking layer on said substrate;defining and etching said blocking layer and said substrate to form at least two trenches therein;firstly implanting said substrate using said blocking layer as a mask to form at least two drift regions having a second conductivity type opposite to the first conductivity type;refilling said trenches by a dielectric layer to form at least two dielectric regions in said substrate, one of said dielectric regions being spaced from the other of the dielectric regions by a channel region;forming and patterning a gate layer to form a gate region on said substrate, said gate region covering the channel region and portions of said dielectric regions; andsecondly implanting said substrate to form source/drain region using said gate region and said dielectric regions as a mask.