Patent ID: 8324083
Filing Date: 2012-12-04
Classification: H01L

Abstract:
1. A method for producing a Group III nitride compound semiconductor element comprising growing an epitaxial layer comprising a Group III nitride compound semiconductor using a different kind of substrate as an epitaxial growth substrate, adhering a supporting substrate to a top surface of the epitaxial layer through a conductive layer, and then removing the epitaxial growth substrate by a laser lift-off, the method for producing a Group III nitride compound semiconductor element comprising: a first groove formation comprising forming, before adhesion of the epitaxial layer and the supporting substrate, a first groove that at least reaches an interface between a bottom surface of the epitaxial layer and the epitaxial growth substrate from the top surface of the epitaxial layer formed on the epitaxial growth substrate and acts as an air vent communicating with an outside of a wafer when the epitaxial layer and the supporting substrate are joined to each other; a second groove formation comprising forming a second groove, after separating the epitaxial growth substrate by the laser lift-off, by removing an outer periphery of the epitaxial layer, the second groove forming a plurality of chips in the epitaxial layer; an insulating protective film formation comprising forming an insulating protective film that completely covers at least an outer peripheral side surface of the epitaxial layer of each of the chips exposed in the second groove formation; and a supporting substrate cutting comprising cutting the supporting substrate for splitting said plurality of chips in the supporting substrate.