Patent ID: 7411232
Filing Date: 2008-08-12
Classification: H01L

Abstract:
1. A semiconductor photodetecting device which converts incident light into electric charges, said device comprising: stacked pn junction layers; and a pn junction isolating layer formed between said pn junction layers which are adjacent to each other, wherein said pn junction isolating layer has openings, wherein said pn junction layers are adjacent to each other through the openings, wherein said pn junction isolating layer is made of a material having a refractive index different from refractive indices of the adjacent layers, and has a light condensing function, wherein the openings of said pn junction isolating layer are concentric on a plane of said pn junction isolating layer, and said pn junction isolating layer is formed so that light that passes through said pn junction isolating layer is brought into focus at a pn junction in said pn junction layer placed below said pn junction isolating layer, and wherein the openings of said pn junction isolating layer include a central opening and a plurality of doughnut-shaped openings surrounding the central opening.