Patent ID: 8928004
Filing Date: 2015-01-06
Classification: C30B,H01L

Abstract:
1. A multilayer structure, comprising: a structure for growth of a nitride semiconductor layer; and a nitride semiconductor layer, wherein the structure for growth of the nitride semiconductor layer comprises: a bottom surface of a recessed portion provided between respective ones of the plurality of ridge-shaped nitride semiconductor regions is the m-plane of the sapphire substrate; a growing plane of the plurality of ridge-shaped nitride semiconductor regions is an m-plane; an absolute value of an angle between an extending direction of the plurality of ridge-shaped nitride semiconductor regions and a c-axis of the sapphire substrate is not less than 5° and not more than 35°; a back surface of the nitride semiconductor layer is in contact with the plurality of the ridge-shaped nitride semiconductor regions; and a front surface of the nitride semiconductor layer has a surface rms roughness of not more than 100 nanometers.