Patent ID: 8999780
Filing Date: 2015-04-07
Classification: H01L

Abstract:
1. A method of making a HEMT device comprising: a. forming a substrate; b. disposing a buffer layer above said substrate; c. disposing a carrier supplying layer above said buffer layer; d. forming a layer of a photoresist on said carrier supplying layer; e. forming a plurality of window openings in said layer of a photoresist, said window openings increasing in size beginning at a starting point and ending at an ending point; f. etching through the layer of a photoresist at least in a region immediately adjacent said window openings to thereby etch a taper into said carrier supplying layer; and g. forming a gate element at or immediately adjacent said starting point and forming a drain element at or immediately adjacent said ending point whereby a relatively thin portion of the taper in the carrier supplying layer is disposed next to said gate element, the carrier supplying layer increasing in thickness along said taper to said drain element.