Patent ID: 8421134

Claim:
A back side illumination image sensor reduced in chip size, the back side illumination image sensor receiving light illuminated from a back side of a semiconductor substrate wherein a pixel region and a peripheral circuit region are formed, the pixel region comprising: a photodiode formed beneath a surface of a front side of the semiconductor substrate, and configured to receive light illuminated from the back side of the semiconductor substrate and to generate photocharge; a transfer transistor configured to transfer the photocharge generated by the photodiode; an interlayer insulating layer formed above the front side of the semiconductor substrate, in which the photodiode is formed; first and second metal wiring layers M 1 and M 2 formed in the interlayer insulating layer, and configured to electrically connect the photodiode and the peripheral circuit region, wherein the first metal wiring layer M 1 is positioned between the second metal wiring layer M 2 and the photodiode; and a capacitor region comprising a plurality of capacitors formed from a third metal wiring layer M 3 and a fourth metal wiring layer M 4 , wherein the capacitor region is formed above the second metal wiring layer M 2 such that the second metal wiring layer M 2 is positioned between the capacitor region and the photodiode.