Patent ID: 7476598

Claim:
A method of manufacturing a photodiode the method comprising: forming a first conductive type buried layer and a first conductive type first epitaxial layer on a semiconductor substrate and a first conductive type first junction region in the first epitaxial layer; forming a second conductive type second epitaxial layer on the first epitaxial layer and forming a first conductive type second junction region in contact with the first junction region extending through the second epitaxial layer; forming a second conductive type first high density doping layer on the second epitaxial layer; forming a first conductive type second high density doping layer in the second junction region; forming a buffer oxide layer and an etching blocking layer on the second epitaxial layer; forming an interlayer insulating layer on the etching blocking layer and a first interconnecting structure in contact with the second high density doping layer on the second junction region; forming an intermetal insulating layer on the interlayer insulating layer and forming a second interconnecting structure on the first interconnecting structure; exposing the etching blocking layer by etching the intermetal insulating layer and the interlayer insulating layer to form a light-receiving unit; removing a portion of the etching blocking layer and the buffer oxide layer of the light-receiving unit by dry etching; and exposing a semiconductor surface of the light-receiving unit by removing the buffer oxide layer remaining in the light-receiving unit by wet etching.