Patent ID: 8436443
Filing Date: 2013-05-07
Classification: H01L

Abstract:
1. A backside illuminated image sensor, comprising: a semiconductive substrate having a first conductivity type and a first doping concentration, the semiconductive substrate having a first surface and a second surface opposite the first surface; a sensor formed in the semiconductive substrate at the first surface, the sensor including at least a photodiode; a first doped region formed in the semiconductive substrate proximate to the second surface, the first doped region having the first conductivity type and a second doping concentration that is greater than the first doping concentration; a second doped region formed in the semiconductive substrate adjacent to the first doped region such that the second doped region is positioned between the first doped region and the second surface, the second doped region having a second conductivity type that is opposite the first conductivity type, and further wherein the first doped region and the second doped region form a depletion region in the semiconductive substrate; a metal interconnection structure formed on the first surface of the substrate; a color filter formed on the second surface of the semiconductive substrate and aligned with the sensor; and a microlens formed on the color filter.