Patent ID: 8426260
Filing Date: 2013-04-23
Classification: H01L

Abstract:
1. A method of manufacturing a compound semiconductor device, comprising: forming an electron transport layer over a substrate; forming an electron supply layer over the electron transport layer; and forming a cap layer over the electron supply layer; wherein the forming of the cap layer includes: forming a first compound semiconductor layer containing GaN; forming a second compound semiconductor layer containing AlN over the first compound semiconductor layer; forming a third compound semiconductor layer containing GaN over the second compound semiconductor layer; and forming at least one of a first AlGaN-containing layer and a second AlGaN-containing layer, with the first AlGaN-containing layer to be formed between the first compound semiconductor layer and the second compound semiconductor layer, the first AlGaN-containing layer having an Al content which increases toward the second compound semiconductor layer, and the second AlGaN-containing layer to be formed between the second compound semiconductor layer and the third compound semiconductor layer, the second AlGaN-containing layer having an Al content which increases toward the second compound semiconductor layer.