Patent ID: 7651883

Claim:
A method for fabricating an array of fully isolated multi-junction complimentary metal-oxide-semiconductor (CMOS) filterless color imager cells, the method comprising: providing a bulk silicon (Si) substrate having a top surface, without an overlying epitaxial Si layer; forming a U-shaped well liner; forming a plurality of color imager cells, where each color imager cell includes a photodiode set with a first, second, and third photodiode formed as a stacked multi-junction structure; and, wherein forming the U-shaped well liner fully isolates the photodiode set from adjacent photodiode sets in the array by; implanting boron (B) ions into the bulk Si substrate at an energy in a range of about 2 to 4 million electronvolts (MeV) and a dopant density in a range of about 5×10 16 to 1×10 19 per cubic centimeter (cm); and, forming a p doped well liner bottom, interposed between the substrate and the photodiode set, about 2 to 5 micrometers below the substrate top surface.