Patent ID: 7371599

Claim:
A manufacturing method of an image sensor comprising: providing a semiconductor substrate; forming a photo receiving area in the semiconductor substrate; forming a gate electrode on one side of the photo receiving area in the semiconductor substrate; forming a dielectric layer on the semiconductor substrate and the dielectric layer covering the gate electrode and the surface of the photo receiving area, wherein the dielectric layer comprises a first anti-reflection layer and a buffer layer; forming a covering layer on the first anti-reflection layer; removing a portion of the covering layer to form a spacer around the gate electrode; performing a source/drain ion implantation process to form a dopant in one side of the gate electrode away from the photo receiving area and on the semiconductor substrate; performing an etching process on the dielectric layer to form a self-alignment silicide block on the gate electrode and the photo receiving area; performing a self-alignment silicide process on the gate electrode without the self alignment silicide block, and the dopant to form a plurality of salicides; forming a second anti-reflection layer on the gate electrode, the self-alignment silicide block, and the semiconductor substrate; forming an inter-layer dielectric on the second anti-reflection layer; and performing a contact hole etching process on the inter-layer-dielectric to form a plurality of contact holes.