Patent ID: 8030653

Claim:
A device comprising: at least one transistor over a pixel region of a first substrate; a first dielectric over the first substrate, the first dielectric including at least one first metal interconnection connected to the at least one transistor, respectively; a crystalline semiconductor layer over the first dielectric; a photodiode in the crystalline semiconductor layer formed in a region corresponding to the pixel region; a dummy region in the crystalline semiconductor layer excepting the region of the photodiode; at least one via contact penetrating the dummy region, and connected to the at least one first metal interconnection, wherein the at least one via contact comprises one of an n-type and a p-type impurity; and a second dielectric including at least one second metal interconnection over the crystalline semiconductor layer, wherein the at least one second metal interconnection electrically connects the at least one via contact to the photodiode.