Patent ID: 8946780
Filing Date: 2015-02-03
Classification: H01L

Abstract:
1. A semiconductor device having an ohmic contact structure for contacting directly to a two-dimensional electron gas layer comprising: a first layer and a second layer over the first layer, the first and second layers configured to form an electron gas layer at an interface of the first and second layers; wherein the first layer comprises Group III-nitride nucleation, buffer, and channel layers; and also wherein the second layer comprises a Group III-nitride barrier layer; two Ohmic contacts; two groups of multiple conductive vias formed through the second layer, each group of conductive vias connected to the two-dimensional electron gas layer and configured to electrically couple the Ohmic contacts to the two-dimensional electron gas layer, wherein each via of each group of conductive vias is configured to have a nano-texture surface forming electrical contact with the two-dimensional electron gas layer at the interface of the first and second layer.