Patent ID: 8119443

Claim:
A method of manufacturing an image sensor, the method comprising: forming a photodiode layer on a metal interconnection layer having a metal interconnection therein, wherein forming the photodiode layer comprises forming an ion implantation layer in a first substrate by implanting ions therein, attaching the first substrate to a second substrate including the metal interconnection layer and separating the photodiode layer by cleaving the first substrate at the ion implantation layer or in a region between the ion implantation layer and a surface of the first substrate that is attached to the second substrate; forming a hard mask layer on the photodiode layer, and forming a photoresist pattern on the hard mask layer to define a contact hole region; forming a first hole in the hard mask layer through an etching process using the photoresist pattern as an etching mask; forming an ion implantation etching layer inside the photodiode layer using the photoresist pattern as an ion implantation mask; forming a second hole by etching the ion implantation etching layer; and forming a third hole to expose the metal interconnection by etching a region of the metal interconnection layer below the second hole.