Substrate for crystal growth, has base on which crystal system containing separate crystals which are different from epitaxial crystal layer, and epitaxial crystal layer having island-like crystals, are formed

摘要

The substrate (11) consists of a base for growing an epitaxial crystal layer (15). A crystal system containing separate crystals which are different from the epitaxial crystal layer, is formed on the substrate. The epitaxial crystal layer has a single crystal layer containing island-like crystals. An Independent claim is also included for the manufacture of the substrate for crystal growth. A buffer layer of the same crystal system is provided as the epitaxial crystal layer. Wet etching of a part of the buffer layer is performed.