Patent ID: 8026132
Filing Date: 2011-09-27
Classification: H01L

Abstract:
1. A process for forming a high electron mobility transistor (HEMT) comprising: (a) providing a substrate; (b) depositing one or more Gallium Nitride (GaN) based materials on said substrate; (c) forming a mesa on said substrate with said GaN based materials which defines a gate region on top of said mesa and drain and source regions on opposing sides next to said mesa on said substrate, said mesa defining vertical sidewalls between said gate region and said drain and source regions and forming steps on opposing sides of said mesa; (d) depositing insulation on said substrate in said drain and source regions so that it is flush with the top of the mesa and flush with said vertical sidewalls, thereby eliminating said steps between said gate region and said drain and source regions; and (e) forming gate metal on a portion of said gate region defining a gate contact and exposed portions on opposing sides of said gate contact; and (f) forming source and drain contacts on said insulation in said drain and source regions and in contact with said exposed portions of said gate region.