Patent ID: 8298854
Filing Date: 2012-10-30
Classification: H01L

Abstract:
1. A method of manufacturing a photodiode comprising the following steps: forming on a first silicon layer of a p-type, a second silicon layer of n-type; forming a silicon region of the n-type that has an impurity concentration higher than that of the second silicon layer at a prescribed depth from the surface of the second silicon layer; forming a silicon oxide film on the surface of at least said silicon region; and forming an antireflection film to cover a portion or the entirety of said silicon oxide film, wherein said silicon oxide film is formed by thermal oxidation; wherein said antireflection film is a silicon nitride film; wherein the film thickness of said silicon oxide film is about 50-120 Å, and the film thickness of the silicon nitride film is about 400-600 Å, and wherein the silicon oxide film decreases, on an interface between the silicon oxide film and a surface of the second silicon layer, a number of dangling bonds of silicon, the resistivity of said silicon region is 0.02-2 Ω·cm, the resistivity of the second silicon layer is 2-4 Ω·cm, the depth of said silicon region from the surface of the second silicon layer is about 0.5 Å, and the thickness of said second silicon layer is about double said depth.