Patent ID: 8558280

Claim:
A method of manufacturing a semiconductor device, which comprises: a substrate; a compound semiconductor layer formed on the substrate; an element forming area provided in the compound semiconductor layer; and at least one semiconductor element, which includes a first main electrode and a second main electrode, wherein the at least one semiconductor element is formed in the element forming area, the method comprising: selectively forming a low crystalline film on the substrate; forming a first compound growth layer, which includes the element forming area on the substrate; and forming a second compound growth layer on the low crystalline film to surround the element forming area when viewed from a plane, wherein the second compound growth layer has a crystallinity lower than a crystallinity of the first compound growth layer; and forming at least one semiconductor element in the element forming area wherein a low crystalline film is selectively formed between the substrate and the second compound growth layer to surround the element forming area when viewed from the plane.