Patent ID: 7816170
Filing Date: 2010-10-19
Classification: H01L

Abstract:
1. A method for forming a dual-pixel full color complementary metal oxide semiconductor (CMOS) imager, the method comprising: forming an n doped substrate; forming a two-photodiode stack including: forming a single photodiode including a second bottom p doped layer overlying the substrate at a third depth, where the third depth is less than, or equal to the first depth, a second bottom n doped layer overlying the second bottom p doped layer, a second top p doped layer directly overlying the second bottom n doped layer without an intervening layer, and a second top n doped layer overlying the second top p doped layer; forming a first shallow trench isolation (STI) region having a maximum STI depth, interposed between the first top n doped layer in the two-photodiode stack and a first n doped vertical column; forming a second STI layer having the maximum STI depth, located in a second p well; wherein forming the first top p doped layer in the two-photodiode stack includes forming a first top p doped layer having a minimum depth not less than the STI maximum depth; and, wherein forming the second top p doped layer in the single photodiode includes forming a second top p doped layer having a minimum depth not less than the STI maximum depth and equal to the depth of the first top p doped layer in the two-photodiode stack.