Patent ID: 7005315

Claim:
A method for fabricating a complementary metal-oxide semiconductor (CMOS) image sensor, wherein the CMOS image sensor includes a photodiode and a transfer transistor, the method comprising the steps of: forming a protective pattern structure on a substrate provided with a device isolation layer; forming a gate structure of the transfer transistor on the substrate; forming an N-type ion implantation region for use in the photodiode in the substrate disposed in a photodiode region; performing a first P 0 -type ion implantation process through the protective pattern structure to form a first P 0 -type ion implantation region between the N-type ion implantation region and a bottom side of a surface of the substrate disposed in the photodiode region; forming a spacer on sidewalls of the gate structure; and performing a second P 0 -type ion implantation process through the protective pattern structure to the photodiode region, wherein the protective pattern structure being separated with a predetermined distance from each edge of the photodiode and an edge of the gate structure and covering a surface of the photodiode.