Patent ID: 6617182
Filing Date: 2003-09-09
Classification: H01L

Abstract:
A method for fabricating a semiconductor device, comprising the steps of:forming a crystal plane on a primary surface of a substrate of a III group nitride compound material to provide a stepped portion so that a surface orientation of the crystal plane is different from a surface orientation of the primary surface of the substrate; wherein the primary surface is in a convex configuration with respect to the crystal plane; wherein the crystal plane forming step includes the steps of forming a mask having a predetermined pattern on the substrate, selectively etching a portion of the substrate not covered with the mask, and removing the mask; and forming a semiconductor layered structure made of a III group nitride compound material directly on both the crystal plane and the primary surface of the substrate, wherein the crystal plane is formed so as to be a tilted surface with respect to the primary surface, whereby a low-defect region in the semiconductor layered structure is provided containing fewer defects as compared to surrounding regions.