Patent ID: 8159005

Claim:
An image sensor, comprising: a readout circuitry on a first substrate; a first interlayer dielectric disposed on the first substrate; an interconnection in the first interlayer dielectric and electrically connected to the readout circuitry; a second interlayer dielectric on the interconnection; an image sensing device including a photodiode directly disposed on an upper surface of the second interlayer dielectric, the photodiode comprising a first conductive type layer over the second interlayer dielectric and a second conductive type layer on the first conductive type layer; a via hole passing through the image sensing device and the second interlayer dielectric; a contact plug in the via hole and electrically connecting the first conductive type layer to the interconnection; and a sidewall dielectric on a sidewall of the second conductive type layer within the via hole, wherein the photodiode is formed over the first substrate, and wherein the second interlayer dielectric intervenes between the first substrate and the photodiode.