Patent ID: 6724063
Filing Date: 2004-04-20
Classification: H01L

Abstract:
A photodiode comprising:an n-type semiconductor substrate; an n-type light receiving layer epitaxially grown on the n-type substrate; a central p-region produced at a center of the light receiving layer by diffusing a p-type dopant; a central pn-junction intervening between the central p-region and the n-type light receiving layer and having a ring end; a diffusion-shield p-region being made by diffusing a p-type dopant in a ring region enclosing the central p-region with an outermost part of the n-type light receiving layer left undoped; a ring peripheral pn-junction intervening between the diffusion-shield p-region and the n-type light receiving layer and having ring ends; a signal p-electrode formed upon the central p-region; a diffusion shield p-electrode formed upon the peripheral ring diffusion-shield p-region; and a protecting film covering the end of the central pn-junction and the ends of the peripheral diffusion-shield pn-junctions, wherein the diffusion shield p-region is a circular ring region, the diffusion-shield p-electrode is a circular ring and the diffusion-shield pn-junction is a circular ring having ends concentrically enclosing the diffusion-shield p-region.