Patent ID: 9082834
Filing Date: 2015-07-14
Classification: H01L

Abstract:
1. A nitride semiconductor device comprising: a substrate; a nitride semiconductor multilayer body formed on the substrate and having a heterointerface; and ohmic electrodes which are made from a TiAl material and at least part of which are formed on the nitride semiconductor multilayer body or in the nitride semiconductor multilayer body, wherein the nitride semiconductor multilayer body includes: a first nitride semiconductor layer formed on the substrate; and a second nitride semiconductor layer formed on the first nitride semiconductor layer to make up a heterointerface in combination with the first nitride semiconductor layer, and wherein a chlorine concentration distribution in a depthwise direction over a range from the ohmic electrodes formed from the TiAl material to the nitride semiconductor multilayer body has: a first chloride concentration peak at a position in vicinity of an interface between the ohmic electrodes and the nitride semiconductor multilayer body and in a substrate side region from the interface; and a second chlorine concentration peak at a position deeper than the first chloride concentration peak, and wherein the chlorine concentration of the second chlorine concentration peak is within a range of 3×10