Patent ID: 8525194
Filing Date: 2013-09-03
Classification: H01L

Abstract:
1. A nitride semiconductor device, comprising: a foundation layer formed on an Al-containing nitride semiconductor layer formed on a silicon substrate, the foundation layer having a thickness not less than 1 micrometer and including GaN; and a functional layer provided on the foundation layer and directly contacting the foundation layer, the functional layer including a first semiconductor layer, the first semiconductor layer including GaN containing an impurity of Si, the first semiconductor layer having an impurity concentration higher than an impurity concentration in the foundation layer, the Al-containing nitride semiconductor layer including a multilayer structure body, the multilayer structure body including a first layer including an Al-containing nitride semiconductor and a second layer including an Al-containing nitride semiconductor, the second layer being stacked with the first layer, an Al containing ratio of the second layer being smaller than an Al containing ratio of the first layer, and the thickness of the foundation layer being thinner than a thickness of the first semiconductor layer.