Patent ID: 8460979

Claim:
A method of forming a backside illuminated image sensor, comprising: providing a first substrate comprising a handle substrate, an insulator formed on the handle substrate, and a semiconductor layer formed on the insulator, wherein the insulator comprises a first oxide layer having a thickness between 0.1 μm and 1 μm formed on the handle substrate, a nitride layer formed on the first oxide layer, and a second oxide layer formed on the nitride layer; forming a sensor element on the semiconductor layer; forming a dielectric layer overlying the semiconductor layer, covering the sensor element; forming an interconnection structure in the dielectric layer, electrically connected to the sensor element; forming a passivation layer on the dielectric layer; bonding a second substrate to the passivation layer; and removing the handle substrate, exposing the first oxide layer forming a conductive layer on the exposed first oxide layer forming an opening through the conductive layer; and forming a second dielectric layer on a surface exposed by the opening.