Patent ID: 8861909

Claim:
A photonic structure comprising: a strip waveguide located over a substrate; a polysilicon material photodetector layer also located over the substrate and optically coupled with the strip waveguide, the polysilicon material photodetector layer contiguous with a semiconductor material slab also located over the substrate, the polysilicon material photodetector layer and the semiconductor material slab being formed of the same polysilicon material; and a pair of electrical contacts contacting a pair of doped semiconductor regions located within separated portions of the polysilicon material photodetector layer, wherein: the semiconductor material slab and the polysilicon material photodetector layer have a dopant concentration from about 1e14 to less than about 1e18 dopant atoms per cubic centimeter; one of the pair of doped semiconductor regions comprises a p+ dopant at a concentration from greater than about 1E18 to about 1E22 dopant atoms per cubic centimeter; and the other of the pair of doped semiconductor regions comprises an n+ dopant at a concentration from greater than about 1E18 to about 1E22 dopant atoms per cubic centimeter.