Patent ID: 9136418
Filing Date: 2015-09-15
Classification: H01L,Y02E

Abstract:
1. An optoelectronic semiconductor device comprising: an absorber layer made of gallium arsenide (GaAs) and having only one type of doping; an emitter layer located closer than the absorber layer to a back side of the device, the emitter layer made of a different material than the absorber layer and having a higher bandgap than the absorber layer; a heterojunction formed between the emitter layer and the absorber layer; a p-n junction 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 at a front side of the device; and an intermediate layer located between the absorber layer and the emitter layer and providing the offset of the p-n junction from the heterojunction, the intermediate layer having the same type of doping as the absorber layer and including the different material, wherein the intermediate layer includes: