Patent ID: 7598553

Claim:
A CMOS image sensor comprising: an epitaxial layer formed on a semiconductor layer; a device isolating layer formed on the epitaxial layer which divides the epitaxial layer into an active region and a device isolating region, the active region including a photo diode region and a transistor region; a drive transistor including a gate electrode with side walls which is formed on the epitaxial layer and a gate spacer formed on both side walls of the gate electrode; a floating diffusion region formed on the epitaxial layer; a trench hole formed in the device isolating layer and the epitaxial layer between the photo diode region and the floating diffusion region; a poly wiring formed in the trench hole which extends from the gate electrode of the drive transistor to the photo diode region or the floating diffusion region; and an impurity diffusion region formed by ion implanting a dopant in the epitaxial layer on the side of the gate spacers formed on the side walls of the gate electrode.