Patent ID: 6878994

Claim:
A MOSgated accumulation channel field effect transistor comprising a highly conductive silicon substrate of one of the conductivity types; a drift region of said one of the conductivity types disposed above said substrate; a channel region of said one of the conductivity types disposed above said drift region and having an impurity concentration less than that of said substrate; a plurality of trenches extending through said channel regions and into said drift region; each of said trenches having respective gate oxide liners alone their vertical walls, and insulation liners at the bottoms of said trenches; a gate of the other conductivity type filling the interior of each of said trenches; an insulation cap over the tops of each of said gates in each of said trenches; a highly conductive source region disposed at the tops of the mesas between each of said trenches and above said channel regions which are in the mesas between each of said trenches; a Schottky barrier contact area formed in the top of each of said mesas; and a top contact metal connected to both said source regions and to said Schottky barrier contact areas; wherein a Schottky barrier contact layer is disposed on said Schottky barrier contact area and is contacted by said top contact metal.