Patent ID: 7402479

Claim:
A fabricating method of a CMOS image sensor, comprising the steps of: forming a transfer gate on a semiconductor substrate where a device isolation layer is formed; forming a first n-type ion implantation region aligned at one side of the transfer gate beneath a region reserved for a spacer of the transfer gate with a first mask, wherein the first n-type ion implantation region has a first width and a first ion implantation depth; forming a second n-type ion implantation region aligned at one side of the transfer gate with a second mask to enclose the first n-type ion implantation region, wherein the second n-type ion implantation region has a second width greater than the first width and a second ion implantation depth greater than the first ion implantation depth; forming a p-type ion implantation region between a surface of the semiconductor substrate and the first n-type ion implantation region with the second mask, the p-type ion implantation region aligned at one side of the transfer gate and partially overlapped with an upper portion of the first n-type ion implantation region; forming spacers on both sidewalls of the transfer gate; and forming a floating diffusion region at the other side of the transfer gate.