Patent ID: 6869817

Claim:
A method of manufacturing an image sensor, comprising the steps of: a) forming a first diffusion layer within a semiconductor substrate, semiconductor substrate being doped of a first conductive dopant and the first diffusion layer being doped of a second conductive dopant; b) forming a gate electrode on the semiconductor substrate, the gate electrode having a first sidewall and a second sidewall; c) forming a second diffusion layer in the semiconductor substrate adjacent the first diffusion layer; d) forming a first spacer at the first sidewall and a second spacer at the second sidewall; e) forming a third diffusion layer in the second diffusion layer adjacent the first spacer, the third diffusion layer being doped with the first conductive dopant; and f) forming a fourth diffusion layer within the semiconductor substrate adjacent the second spacer, the fourth diffusion layer being doped with the second conductive dopant, wherein a part of the first diffusion layer is under the fourth diffusion layer.