Patent ID: 8502271
Filing Date: 2013-08-06
Classification: H01L

Abstract:
1. A photo-detector comprising: a first layer having predetermined majority and minority carrier types with corresponding energy bands; a Barrier comprising a semiconductor with a Barrier energy gap and corresponding conduction and valence bands, a first side of said Barrier adjacent a first side of said first layer; a second layer having the predetermined majority and minority carrier types with a second layer energy gap, said second layer being adjacent a second side of said Barrier opposing said first side; wherein the Barrier conduction and valance band edges are aligned with respect to the first and second layer energy bands so as to allow minority carrier current flow while blocking majority carrier current flow between the first and second layers; wherein the second layer is delineated into pixel regions and non-pixel regions that separate the pixel regions from each-other leaving at least part of the Barrier as a physically continuous layer such that the first side of said Barrier laterally extends beyond at least one pixel region; where the non-pixel regions of the second layer impede carrier current flow between pixels; where the non-pixel regions include material from the second layer adjacent to the Barrier; where the non-pixel regions include composite regions having an outer shell of a first doping type and an inner plug of a second doping type; where the inner plug is fully surrounded by the outer shell; and where the outer shell extends from the delineated layer, through the Barrier, and into the first layer.