Patent ID: 8809907
Filing Date: 2014-08-19
Classification: H01L

Abstract:
1. A high electron mobility transistor (HEMT) comprising: a substrate; a mesa formed on a portion of said substrate with one or more GaN materials to form a planar top of said mesa and exposed portions of said substrate adjacent opposing sides of said mesa, said mesa defining vertical sidewalls and forming steps on opposing sides of said mesa; a single layer of an insulating material disposed on said exposed portions of the vertical sidewalls of said substrate, said insulating material flush with the top of the mesa and flush with said vertical sidewalls; a gate metal contact having a planar bottom surface disposed on a portion of said planar top of the mesa; and single material source and drain contacts each having planar bottom surfaces that are in contact with and overlap a portion of said insulation that is flush with the top of the mesa, and also are in contact with and reside on said planar top of the mesa.