Patent ID: 6232642
Filing Date: 2001-05-15
Classification: H01L

Abstract:
A semiconductor device comprising at least:a source region, a drain region and a channel formation region formed using a single crystal semiconductor;a field oxide surrounding said source region, drain region and channel formation region; anda gate insulator and a gate electrode formed over said channel formation region, whereinan impurity region shifting an energy band of said channel formation region is intentionally and locally provided only at an end of said channel formation region which is in contact with said field oxide,said impurity region suppresses the expansion of a depletion layer from said drain region toward said source region,the length of said channel formation region (channel length) is in the range from 30 to 500 nm and wherein the width of said channel formation region (channel width) is in the range from 30 to 500 nm, andsaid impurity region is doped with an impurity element of a conductivity type opposite to a conductivity type of said source region and said drain region.