Patent ID: 8049291

Claim:
A semiconductor optical sensor, comprising: a substrate including a circuit element forming region and a photodiode forming region provided separately from said circuit element forming region, said substrate having a silicon substrate, an insulating layer formed on said silicon substrate, and a silicon layer formed on said insulating layer; a photodiode formed in said silicon layer of said photodiode forming region; a circuit element formed in said silicon layer of said circuit element forming region; a first interlayer insulating film formed over said silicon layer of said substrate; a first light-shielding film formed on said first interlayer insulating film of said circuit element forming region and comprising an opening exposing said photodiode forming region; and a first inter-region light-shielding plug interposed between said circuit element forming region and said photodiode forming region, and extending through said insulating layer, said silicon layer, and said first interlayer insulating film so as to contact said first light-shielding film and said substrate at respectively opposite ends of said first inter-region light-shielding plug.