Patent ID: 7521658
Filing Date: 2009-04-21
Classification: H01L

Abstract:
1. A pixel, comprising: a substrate; a plurality of photoconductive layers sequentially deposited on and substantially parallel to the substrate and configured to receive incident electromagnetic radiation, wherein each photoconductive layer is configured to absorb a different range of wavelengths of incident electromagnetic radiation and configured to provide an indication to a respective readout circuit of an amount of incident electromagnetic radiation absorbed by the layer based on a change in the resistance of the layer; a plurality of insulating layers disposed between successive photoconductive layers and between a bottom-most photoconductive layer of the plurality of photoconductive layers and the substrate, each photoconductive layer has a top surface and a bottom surface and the insulating layers are configured such that one of the insulating layers is in contact with the bottom surface of one photoconductive layer and the top surface of the next photoconductive layer; and a plurality of contacts, one respective contact disposed on each of at least two end portions of a surface of each photoconductive layer, each contact having a lead coupled to it and disposed so as to couple the respective readout circuit to each of the plurality of photoconductive layers, each respective readout circuit including a readout capacitor and a transistor coupled in series with one of the photoconductive layers, wherein the range of wavelengths absorbed by each respective photoconductive layer depends at least on a distance between the respective photoconductive layer and the substrate.