Patent ID: 6855595

Claim:
A method for manufacturing an image sensor, the method comprising: a) forming a photo-sensing element in a semiconductor substrate; b) forming a first dielectric layer on top of the semiconductor substrate; c) forming a first conductive layer on top of the first dielectric layer; d) patterning, substantially simultaneously, the first dielectric layer and the first conductive layer to form an insulating film and a bottom electrode of a capacitor structure and a gate dielectric and a gate electrode of a transfer transistor; e) forming successively a second dielectric layer and a second conductive layer over the semiconductor substrate; and f) removing portions of the second conductive layer and the second dielectric layer that overlie the photoelectric element and overlie the gate dielectric to form a capacitor dielectric and a top electrode of the capacitor structure; wherein a portion of the top electrode is in contact with the photo-sensing element.