Patent ID: 7632730

Claim:
A method for manufacturing a CMOS image sensor, comprising: forming an isolation layer and an active region for a unit pixel on a semiconductor substrate; forming a transistor on said semiconductor substrate; forming a masking layer against an ion implantation on the isolation layer and on a portion of the active region on a boundary between the isolation layer and the active region; and forming an impurity diffusion region for a photo diode formed in a portion of the active region and separated from an isolation region by performing an ion implantation of impurities, wherein forming the impurity diffusion region for a photo diode comprises: forming an n − type diffusion region in the active region; and forming a P 0 type diffusion region on the n − type diffusion region, wherein a non-diffusion region, where impurities are not diffused, is formed between the isolation region and both the n − type diffusion region and the P 0 type diffusion region of the impurity diffusion region, the non-diffusion region being formed on at least two sides of the impurity diffusion region.