NOVELTY - A photoelectric device (100) comprises two electrodes (120, 130); semiconductor nanowires (140) in electrical communication with electrodes, and including a ligand bound to nanowire surface; and J-aggregate (160) electrostatically associated with portion of nanowires. The ligand includes a moiety having an affinity for a surface of nanowire, and second moiety bearing an electrostatic charge. The J-aggregate bears an electrostatic charge opposite to electrostatic charge of second moiety. The ligand is polydentante ligand; and includes more than one moiety bearing electrostatic charge.    USE - As a photoelectric device, such as color selective photodetector.    ADVANTAGE - The present device, by including semiconductor nanowire electrostatically associated with a J-aggregate, facilitates absorption of a desired wavelength of light by J-aggregate, and charge transport by semiconductor nanowire. Thus the color of light detected by the device is chosen by selecting a J-aggregate with a corresponding peak absorption wavelength.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the device involving: forming semiconductor nanowires; contacting the semiconductor nanowires with a ligand, where the ligand includes a first moiety having an affinity for a surface of the nanowire, and a second moiety bearing an electrostatic charge; contacting the semiconductor nanowires with a J-aggregate; and arranging the semiconductor nanowires in electrical communication with a first electrode and a second electrode which are supported on a substrate (110).    DESCRIPTION OF DRAWING(S) - The figures show a schematic view of a photodetector, and a schematic view of a semiconductor nanowire/J-aggregate composite and includes structures of certain J-aggregating dyes.    Device (100)    Substrate (110)    First electrode (120)    Second electrode (130)    Semiconductor nanowires (140)    Semiconductor core nanowire (150)    Electrostatically associated J-aggregate (160)