Patent ID: 9379195
Filing Date: 2016-06-28
CPC Classification: H01L

Claim Text:
1. A high electron mobility field effect transistor (HEMT) having a substrate, a channel layer on the substrate and a barrier layer on the channel layer, the HEMT comprising: a stress inducing layer on and in contact with the barrier layer, wherein the stress inducing layer varies a piezo-electric effect in the barrier layer in a drift region between a gate and a drain, and wherein the stress inducing layer extends from the gate to under the drain; wherein the piezo-electric effect in the barrier layer varies a two dimensional electron gas (2DEG) in the drift region between the gate and the drain; wherein the two dimensional electron gas (2DEG) has a non-uniform lateral distribution in the drift region between the gate and the drain; wherein the stress inducing layer comprises a material having a plurality of varying size openings that decrease in size or increase in size from the gate towards the drain; wherein the plurality of openings in the stress inducing layer are between the gate and the drain; and wherein the plurality of openings in the stress inducing layer extend through the stress inducing layer to the barrier layer.