Patent ID: 7135349

Claim:
A method of fabricating a photodiode, comprising: forming a buried layer of a first conductive type on a semiconductor substrate and forming a first intrinsic capping epitaxial layer on the buried layer; forming a first intrinsic epitaxial layer of the first conductive type on the first intrinsic capping epitaxial layer and forming a first junction region of the first conductive type in the first intrinsic epitaxial layer; forming a second intrinsic capping epitaxial layer on the second intrinsic epitaxial layer; forming a second junction region of the first conductive type such that the second junction region passes through the second intrinsic capping epitaxial layer and the second intrinsic epitaxial layer, and contacts the first junction region; and forming a first electrode on a surface of the second junction region and forming a second electrode on a surface of the second intrinsic capping epitaxial layer.