Patent ID: 8154095

Claim:
An image sensor comprising: a readout circuitry at a first substrate; an interlayer dielectric on the first substrate; an interconnection in the interlayer dielectric, the interconnection being electrically connected to the readout circuitry; an image sensing device on the interconnection, the image sensing device comprising a first conductive type layer and a second conductive type layer; a contact electrically connecting the first conductive type layer of the image sensing device and the interconnection, wherein the contact is disposed in a trench penetrating the image sensing device to expose the interconnection; an ion implantation region in the second conductive type layer; and a pixel separation layer at a pixel boundary of the image sensing device, wherein the ion implantation region comprises a first conductive type ion implantation region, the first conductive type on implantation region separating the contact and the second conductive type layer.