Patent ID: 8304821

Claim:
A complementary metal oxide semiconductor (CMOS) image sensing device, comprising: a semiconductor substrate having a source/drain region; a photodiode having a surface area defined on the substrate and disposed at a given distance from the source/drain region; a gate dielectric layer covering the surface area of the photodiode and the source/drain region of the substrate; a polysilicon layer directly provided over the gate dielectric layer, the polysilicon layer comprising a polysilicon interconnect and a plurality of gates, the polysilicon interconnect contacting a given area of the photodiode less than the covered surface area of the photodiode via an opening in the gate dielectric layer, the given area being doped to provide an ohmic contact for the polysilicon interconnect; a second interconnect connecting the polysilicon interconnect to a conductive layer provided above the polysilicon interconnect; a reset transistor coupled to the photodiode; a source follower transistor coupled to the photodiode; a select transistor coupled to the source follower transistor; and a third interconnect connecting the conductive layer to a gate of the source follower transistor; wherein the given area of the photodiode defines a node that is coupled to the reset transistor and the source follower transistor.