Patent ID: 8759141
Filing Date: 2014-06-24
Classification: H01L

Abstract:
1. A method for fabricating a backside illuminated image sensor, the method comprising: providing a substrate having a front side, a backside, and a first thickness; forming a plurality of sensors in the substrate at the front side, wherein each of the plurality of sensors includes at least a photodiode; reducing the thickness of the substrate from the first thickness to a second thickness; after reducing the thickness of the substrate from the first thickness to the second thickness, forming a first doped region in the substrate proximate to the back side, the first doped region having a first conductivity type; and forming a second doped region in the semiconductor substrate adjacent to the first doped region such that the second doped region is positioned between the first doped region and the backside of the semiconductor substrate, the second doped region having a second conductivity type that is opposite the first conductivity type.