Patent ID: 9178099
Filing Date: 2015-11-03
Classification: H01L,Y02E

Abstract:
1. A method for forming an optoelectronic semiconductor device, the method comprising: forming an intermediate layer on an absorber layer, wherein the absorber layer is made of gallium arsenide (GaAs) and has only one type of doping, the intermediate layer having the same type of doping as the absorber layer; and forming an emitter layer on the intermediate layer, wherein the emitter layer is located closer than the absorber layer to a back side of the device, the emitter layer being made of a different material than the absorber layer and having a higher bandgap than the absorber layer, wherein the intermediate layer includes the different material of the emitter layer, wherein a heterojunction is formed between the emitter layer and the absorber layer, and wherein a p-n junction is formed between the emitter layer and the absorber layer at a location offset from the heterojunction, the p-n junction causing a voltage to be generated in the device in response to the device being exposed to light.