Patent ID: 8796737

Claim:
A high electron mobility transistor (HEMT), comprising: a channel layer; a channel supply layer configured to induce a 2-dimensional electron gas (2DEG) in the channel layer, the channel supply layer including a first material layer and an etch stop layer, the first material layer including a recess region exposing the etch stop layer, a thickness of the channel supply layer in the recess region being less than 20 nm, and a portion of the 2DEG corresponding to the recess region does not exist due to the thickness of the channel supply layer in the recess region; a gate electrode on the recess region; and a source electrode and a drain electrode at respective sides of the gate electrode, wherein one of the etch stop layer and the first material layer is an Al x Ga 1-x N layer, where x is 0.1≦x<0.5; and the other of the etch stop layer and the first material layer is an Al y In 1-y N layer, where y is 0.5≦y≦0.9 and v is greater than x.