Patent ID: 7883957

Claim:
A method for manufacturing an image sensor, comprising: preparing a first substrate having a lower metal line and circuitry thereon; preparing a second substrate having a photodiode thereon; forming a pixel isolation layer in the photodiode of the second substrate, the pixel isolation layer separating the photodiode according to pixels; bonding the first substrate to the second substrate such that the photodiode in which the pixel isolation layer is formed electrically contacts the lower metal line; removing a portion of the bonded second substrate to leave the photodiode on the first substrate; and forming a second conductive type ion implantation layer at lateral regions between the photodiode and the pixel isolation layer, wherein the photodiode is formed vertically above the circuitry, wherein forming the pixel isolation layer comprises: forming a trench in the photodiode corresponding to a region between pixels; and filling the trench with an insulating layer, wherein forming the second conductive type ion implantation layer comprises: implanting second conductive type ions into the photodiode at the region between pixels after tilling the trench with the insulating layer to provide the second conductive type ions at the lateral region between the trench and the photodiode.