Patent ID: 7759756

Claim:
A dual-pixel full color complementary metal oxide semiconductor (CMOS) imager comprising: a two-photodiode stack including: an n doped substrate; a bottom photodiode with a bottom p doped layer overlying the substrate at a first depth and connected to a ground, and a bottom n doped layer cathode overlying the bottom p doped layer; a top photodiode having top p doped layer connected to the ground, directly overlying the bottom n doped layer without an intervening layer, at a second depth, and a top n doped layer cathode overlying the top p doped layer; a single photodiode including: the n doped substrate; a p doped layer overlying the substrate at a third depth and an n doped layer cathode overlying the p doped layer, where the third depth is less than, or equal to the first depth; a first p well overlying exterior edges of the bottom p doped layer, surrounding the top and bottom diodes and connected to the top p doped layer; and, an n doped vertical column overlying the bottom p doped layer, extending to a stack top surface, and adjacent a first p well liner and the bottom n doped layer; a second p well overlying exterior edges of the single photodiode p doped layer, surrounding the single photodiode.