Patent ID: 8174035
Filing Date: 2012-05-08
Classification: B82Y,H01L,H01S

Abstract:
1. A nitride-based semiconductor light emitting device comprising: a GaN substrate; a hexagonal GaN-based semiconductor region provided on a primary surface of the GaN substrate and comprising a light emitting layer; and an electrode provided on the GaN-based semiconductor region and comprised of metal, the GaN-based semiconductor region comprising a contact layer, the contact layer being strained, the contact layer being in contact with the electrode, the primary surface extending along a reference plane, the reference plane being inclined at a predetermined inclination angle with respect to a plane perpendicular to a c-axis direction of the GaN substrate, the inclination angle being either in the range of more than 40° and less than 90° or in the range of not less than 150° to less than 180°, the GaN-based semiconductor region being lattice-matched with the GaN substrate, the contact layer being comprised of p-type doped InGaN or p-type doped InAlGaN, the contact layer of the p-type doped InGaN having a composition ratio of In in the range of not less than 1% and not more than 20%, and the contact layer of the p-type doped InAlGaN having a composition ratio of In larger than a value obtained by multiplying a composition ratio of Al of the contact layer by 0.22.