Patent ID: 7534643

Claim:
A method for fabricating a CMOS (complementary metal oxide silicon) image sensor comprising: forming a gate electrode on a pixel region of a semiconductor substrate and, at the same time, forming a polysilicon pattern on a middle resistor region of the semiconductor substrate; forming a first lightly doped n-type diffusion region on a photodiode region of the pixel region; forming a second lightly doped n-type diffusion region on a transistor region of the pixel region; consecutively forming a first insulating layer and a second insulating layer on the semiconductor substrate; removing a predetermined portion of the second insulating layer from the transistor region and the middle resistor region; forming a third insulating layer on the semiconductor substrate; forming sidewalls of the first insulating layer and the second insulating layer on the gate electrode and the polysilicon pattern by performing an etch-back process; and implanting n-type impurities in the transistor region and the polysilicon pattern.