Patent ID: 8895349
Filing Date: 2014-11-25
Classification: H01L

Abstract:
1. A method of forming a backside illuminated image sensor, the method comprising: forming a sensor element overlying a semiconductor substrate, the semiconductor substrate having a front side and a backside, the sensor element being formed to overlie the front side of the semiconductor substrate, the sensor element being at least partially formed by: forming a capacitor overlying the sensor element, the capacitor being formed to overlie an entirety of the light sensing region in one direction and be electrically connected to the drain; forming a plurality of dielectric layers overlying the sensor element; and forming an interconnection structure in the plurality of dielectric layers, wherein at least two metal layers of the interconnection structure and at least one of the plurality of dielectric layers between the at least two metal layers form the capacitor and an additional metal layer of the interconnection structure is electrically connected between the sensor element and the capacitor.