Patent ID: 8759879
Filing Date: 2014-06-24
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a substrate; an electrical isolation layer formed over said substrate, said electrical isolation layer comprising mostly gallium nitride; a low-defect layer formed over said electrical isolation layer, said low-defect layer comprising mostly gallium nitride; a barrier layer of III-N semiconductor material formed on said low-defect layer; and a gate of a gallium nitride field effect transistor (GaN FET) formed over said barrier layer; in which at least one of said electrical isolation layer and said low-defect layer includes added n-type dopants so that a sheet charge carrier density of said added n-type dopants is 1 percent to 200 percent of a sheet charge carrier density of a two-dimensional electron gas in said low-defect layer, said two-dimensional electron gas being generated by formation of said barrier layer on said low-defect layer.