Patent ID: 8368158

Claim:
An image sensor having a wave guide, comprising: a semiconductor substrate formed with a photodiode and a peripheral circuit region; an anti-reflective layer formed on the semiconductor substrate; an insulation layer formed on the anti-reflective layer; a wiring layer formed on the insulation layer and connected to the semiconductor substrate, wherein the wiring layer comprises a conductive layer which is directly connected to a well formed in the semiconductor substrate; at least one interlayer dielectric stacked on the wiring layer; and a wave guide connected to the insulation layer by passing through the interlayer dielectric and the wiring layer, wherein the vertical edges of the wiring layer contact the wave guide, wherein the wave guide is formed by: etching the interlayer dielectric until a portion of the wiring layer is exposed to enable plasma-charged ions produced in the course of forming the wave guide to be discharged through the wiring layer to the semiconductor substrate; and after the portion of the wiring layer is exposed, etching the portion of the wiring layer.