Patent ID: 7655965

Claim:
A semiconductor light receiving device comprising: a plurality of photodiode units, each of which is configured to convert a received light into an electric signal; and a separating unit configured to electrically separate an adjacent pair of said plurality of photodiode units from each other, said separating unit having a light-receiving surface portion with no more than a first concentration of an impurity, and an embedded portion beneath the surface portion having a second concentration of the impurity higher than the first concentration, said separating unit not having an electrode that blocks received light, wherein each of said photodiode units includes, a first semiconductor layer common among said plurality of photodiode units and having a first conductivity type, and a second semiconductor layer connected to said first semiconductor layer and having a second conductivity type different from said first conductivity type, wherein said embedded portion penetrates to said first semiconductor layer and has said first conductivity type, and wherein said second semiconductor layer includes a diffused portion of said second conductivity type in a light receiving side of said second semiconductor layer and having a higher impurity concentration than a remainder of said second semiconductor layer.