Patent ID: 8669588
Filing Date: 2014-03-11
Classification: G01J,H01L

Abstract:
1. A unit cell for use in an imaging system, comprising: an absorber layer of semiconductor material formed on a semiconductor substrate, the absorber layer configured to absorb incident photons such that the absorbed photons excite electrons in the absorber layer to generate a photocurrent, the absorber layer electrically coupled to a cathode positioned at a periphery of the unit cell; a plurality of anodes electrically coupled to the absorber layer and configured to conduct the photocurrent to one or more electrical components external to the unit cell, the plurality of anodes including semiconductor material formed on the semiconductor substrate, the plurality of anodes comprising a first semiconductor composition, a first dopant concentration, and a first dimension selected to provide a first optimized resistivity; and a cap layer of semiconductor material formed on the semiconductor substrate and electrically coupled to and formed between the absorber layer and the plurality of anodes and including a grid delineation, the cap layer configured to conduct the photocurrent between the absorber layer and the plurality of anodes, the cap layer comprising a second semiconductor composition, a second uniform and continuous dopant concentration, and a second dimension selected independently from the selection of the first semiconductor composition, the first dopant concentration, and the first dimension, to provide a second optimized resistivity.