Patent ID: 7491991

Claim:
A method for fabricating a CMOS image sensor comprising: forming a gate electrode with a gate insulating layer interposed on a transistor region of a semiconductor substrate having an active region defined by a photodiode and the transistor region; forming a first impurity region of a first conductive type at the transistor region at a first side of the gate electrode; forming a second impurity region of the first conductive type at the photodiode region at a second side of the gate electrode; forming sidewalls comprising a first insulating layer and a second insulating layer at the first side and the second side of the gate electrode; forming a third impurity region of the first conductive type at the first side of the gate electrode where the first impurity region is formed; and forming a fourth impurity region of a second conductive type by implanting impurity ions of a second conductive type into the gate electrode, the photodiode region including the second impurity region, and the transistor region using the sidewalls as a hard mask.