Patent ID: 8202757

Claim:
A method for manufacturing an image sensor, comprising: forming readout circuitry on a first substrate; forming a first dielectric layer on the first substrate, and a metal line in or on the first dielectric layer in electric connection with the readout circuitry; forming a second dielectric layer on the metal line; forming an image sensing device on the second dielectric layer, including a first conductivity type ohmic contact layer, a first conductivity type conduction layer, and a second conductivity type conduction layer, the first conductivity type conduction layer having a greater thickness than the second conductivity type conduction layer; forming a first via hole through the second conductivity type conduction layer; forming a sidewall dielectric in the first via hole on a sidewall of the second conductivity type conduction layer; forming a second via hole at a bottom of the first via hole, exposing the metal line, using the sidewall dielectric as an etching mask; forming a contact plug in the second via hole to connect the first conductivity type conduction layer with the metal line; and forming an interpixel dielectric through the image sensing device and the first conductivity type conduction layer.