Patent ID: 8691674

Claim:
A method for producing a group 3-5 nitride semiconductor, comprising the steps of (i), (ii), and (iii) in this order: (i) placing spherical inorganic particles directly on a substrate consisting of sapphire, SiC, Si, MgAl 2 O 4 , LiTaO 3 , ZrB 2 , GaN, or AlN to form a mask, wherein the placement is carried out by a method of dipping the substrate in a slurry containing the inorganic particles and a medium, or a method of applying or spraying the slurry onto the substrate and then drying the slurry, (ii) epitaxially growing a semiconductor layer by using said mask formed from said inorganic particles whereby said inorganic particles are embedded in the semiconductor layer, the semiconductor layer having a form of a multilayer and including a low temperature grown buffer layer having a thickness from 100 Å to 5000 Å adjacent to the substrate, and (iii) separating the substrate and the semiconductor layer by irradiating the interface between the substrate and the semiconductor layer with light, wherein the light is further irradiated to the inorganic particles.