Patent ID: 8313977

Claim:
A method for manufacturing an image sensor, comprising: forming a readout circuitry on a semiconductor substrate; forming an interconnection and an interlayer dielectric on the semiconductor substrate, the interconnection being electrically connected to the readout circuitry; forming an image sensing device on a carrier substrate; forming a lower electrode layer on the image sensing device; forming a junction layer on the lower electrode layer; bonding the image sensing device to the interlayer dielectric using the junction layer as a bonding layer; forming a first via hole through the image sensing device, the first via hole exposing a portion of the lower electrode layer at a region corresponding to the interconnection; forming a barrier pattern on a sidewall of the first via hole; forming a second via hole through the lower electrode layer and the interlayer dielectric under the first via hole, the second via hole exposing the interconnection; and forming a metal contact in the first via hole and the second via hole to electrically connect the lower electrode layer and the interconnection.