Patent ID: 7867808

Claim:
A method, comprising: providing a first substrate; forming circuitry including a metal interconnection over the first substrate; forming a photodiode in a crystalline semiconductor layer of a second substrate; forming an ion implantation isolation layer in the photodiode; bonding the first substrate to the second substrate to connect the photodiode to the metal interconnection; and removing a lower portion of the second substrate to expose the photodiode, wherein forming the photodiode comprises: forming a second conduction type conduction layer in the crystalline semiconductor layer; and forming a first conduction type conduction layer over the second conduction type conduction layer, wherein forming the ion implantation isolation layer in the photodiode comprises forming a second conduction type first ion implantation isolation layer over the first conduction type conduction layer, wherein forming the ion implantation isolation layer in the photodiode comprises forming a second conduction type second ion implantation isolation layer at an interface between pixels of the photodiode.