Patent ID: 7354789

Claim:
A method for fabricating a CMOS image sensor, comprising the steps of: forming a device isolation film in a second conductive type semiconductor substrate, defining an active region having a photodiode region and a transistor region; forming a gate insulating film and a gate electrode on the transistor region of the semiconductor substrate; forming a lightly doped first conductive type impurity region in the photodiode region of the semiconductor substrate; forming a medium concentration second conductive type impurity region at a surface of the lightly doped first conductive type impurity region; and forming a heavily doped second conductive type impurity region adjacent to the device isolation film in the photodiode region of the substrate, the heavily doped second conductive type impurity region having a depth the same as a depth of the device isolation film, or a depth of the lightly doped first conductive type impurity region.