Patent ID: 8669591

Claim:
A semiconductor field effect transistor comprising: at least one compound semiconductor layer, formed with at least one of the semiconductor materials belonging to the group comprising III-V and II-VI compounds semiconductors; at least one dielectric layer formed above at least a portion of at least one of said at least one compound semiconductor layer; at least one semiconductor gate region formed above at least a portion of at least one of said at least one dielectric layer; a source region and drain region; wherein said semiconductor field effect transistor is an hetero-structure field effect transistor; wherein said semiconductor gate region is a compound semiconductor region, formed with at least one of the semiconductor materials belonging to the group comprising III-V and II-VI compound semiconductors; wherein said semiconductor field effect transistor is an enhancement mode device; wherein at least a portion of at least one of said at least one semiconductor gate region is in physical contact with at least a portion of said at least one dielectric layer; wherein at least one of said at least one semiconductor gate region is heavily doped, and wherein, when said semiconductor field effect transistor is a n-channel device and said semiconductor gate region is not at least partially overlapped with at least a portion of at least one of said source and drain regions, said semiconductor gate region is doped with n-type impurities.