Patent ID: 8736006

Claim:
An image sensor device having a radiation-absorption region and a radiation-blocking region, the image sensor device comprising: a substrate having front and back surfaces and extending across both the radiation-absorption and radiation-blocking regions; a plurality of radiation sensors formed in the substrate adjacent the front surface in the radiation-absorption region, the radiation sensors being operable to detect radiation waves that enter the substrate through the back surface; a first insulation layer formed over the back surface of the substrate; an anti-reflective coating layer formed over the first insulation layer; a conductive layer formed in the radiation-blocking region, the conductive layer comprising a horizontal portion disposed over the anti-reflective coating layer and one or more vertical portions extending substantially perpendicularly from the horizontal portion, penetrating through the anti-reflective coating layer and the first insulation layer, and reaching the substrate for grounding the conductive layer, each of the one or more vertical portions having a sidewall substantially perpendicular to the horizontal portion; and a sidewall insulating layer disposed between the sidewall of each vertical portion and the surrounding anti-reflective coating layer for electric insulation therebetween.