Patent ID: 7829367

Claim:
A method for manufacturing an image sensor, the method comprising: forming a gate electrode on a substrate including a photodiode region, wherein the gate electrode is formed adjacent to the photodiode region; forming a photoresist on the substrate, wherein the photoresist covers one part of the gate electrode; forming an oxide layer on the substrate where the photodiode is formed, wherein the oxide layer covers the photodiode region and another part of the gate electrode; removing the photoresist from the substrate and cleaning the substrate; forming a first oxide film on the substrate opposite to the photodiode region, the one part of the gate electrode where the photoresist is removed, and the oxide layer remaining on the photodiode region; forming a nitride film on the first oxide film; forming a second oxide film on the nitride film; and performing blank etching on the first oxide film, the nitride film, and the second oxide film to form a spacer at a sidewall of the one part of the gate electrode.