Patent ID: 8592247
Filing Date: 2013-11-26
Classification: H01L,Y02E

Abstract:
1. A method of fabricating an avalanche photodiode, comprising: forming an epitaxy wafer by growing a plurality of layers, which comprise an amplifying layer on the surface of a substrate; forming a diffusion control layer on the amplifying layer; forming a protective layer for protecting the diffusion control layer on the diffusion control layer; forming an etching part by etching from the protective layer to a predetermined depth of the amplifying layer; forming a first patterning part by patterning the protective layer; forming a junction region and a guardring region at the amplifying layer by diffusing a diffusion material to the etching part and the first patterning part; wherein the diffusion control layer controls a diffusion depth of the guardring region and the junction region, when a diffusion material is diffused to the amplifying layer to form the guardring region and the junction region.