Patent ID: 7238560
Filing Date: 2007-07-03
Classification: H01L

Abstract:
1. A method of fabricating a high electron mobility transistor (HEMT), comprising: forming a channel layer; forming a barrier layer on the channel layer; forming a cap layer on the barrier layer; forming spaced apart ohmic contact recesses in the cap layer; forming ohmic contact material patterns in the ohmic contact recesses; forming a gate recess in the cap layer that extends to the barrier layer; annealing the barrier layer, channel layer, ohmic contact material patterns and cap layer with the gate recess, the ohmic contact material being annealed for a first time; and then forming a gate contact in the annealed gate recess, wherein the step of annealing is preceded by forming an encapsulation layer on the cap layer and in the gate recess, wherein the step of forming the gate contact is preceded by removing the encapsulation layer and wherein the encapsulation layer comprises AlN.