Patent ID: 7479672
Filing Date: 2009-01-20
Classification: H01L

Abstract:
1. A vertical junction field-effect transistor (VJFET) having a plurality of semiconductor layers, comprising: a drain layer of heavily doped semiconductor of a first conductivity type and operable as a drain for said transistor; a blocking layer of lightly doped semiconductor of the first conductivity type formed on top of said drain layer; a channel layer formed on top of said blocking layer; the channel layer having a plurality of vertical channels of the first conductivity type spaced apart by U-shaped regions of heavily doped semiconductor of the second conductivity type; the second conductivity type having an opposite conductivity of the first conductivity type; wherein the sides of the U-shaped regions form vertical gate junctions with said vertical channels; and a source layer of very heavily doped semiconductor of the first conductivity type on top of said vertical gate junctions and operable as a source for said transistor; wherein said vertical gate junctions produce a vertical channel opening of a uniform width for operation of the VJFET.