Patent ID: 8569809

Claim:
A sensor device, comprising: a substrate having an upper surface with contacts thereon; a first organic semiconductor layer supported above the substrate, the first organic semiconductor layer including a plurality of sensor cells therein and comprising a grounded surface grid, the grounded surface grid comprising a plurality of doped p-type lines arranged in a grid and adjacent to a top surface of the first organic semiconductor layer; a second organic semiconductor layer positioned between the first organic semiconductor layer and the substrate, the second organic semiconductor layer comprising a control unit for the sensor device and a plurality of conductors on a bottom surface of the second organic semiconductor layer, the conductors configured to communicate with the contacts, the control unit configured to selectively access each of the plurality of sensor cells; a reactive interface layer disposed on the first organic semiconductor layer and having an exposed upper surface, the reactive interface layer comprising a polymer containing a chemical that is selectively reactive to a specific substance in contact with the exposed upper surface; and a frame extending outward from the substrate and adjacent to an edge of the reactive interface layer, the second organic semiconductor layer, and the first organic semiconductor layer, the frame comprising a frame portion that extends over and contacts a portion of a top surface of the reactive interface layer, the frame configured to secure the layers to the substrate; wherein a depletion region in each sensor cell is configured to vary in at least one dimension in response to a reaction in the reactive interface layer of the chemical therein with the specific substance, the variation in the at least one dimension of the depletion region configured to cause a variation in a capacitance in the sensor cell.