title: Achieving high sensitivity in hybrid photodetectors based on an organic single crystal and an inorganic nanocrystal array.
abstract: We demonstrate an approach to enhance the photosensitivity of an organic single-crystal photodetector by combining it with a nanocrystal (NC) array. A systematic study of the dependence of the photodetector performance on illumination wavelength and light power together with the charge carrier mobility reveals that charge separation at the single-crystal/CdSe NC interface and subsequent electron trapping in the CdSe NCs generates effective photoconductive gain by hole circulation through the high-mobility single crystal. As a result, the responsivity and specific detectivity reached values up to 50 A W(-1) and 2 × 10(9) cm Hz(1/2) W(-1), respectively.
authors.affiliation: School of Chemical Engineering and Material Science, Chung-Ang University, Seoul, 156-756, Korea.
authors.forename: Dae Sung
authors.initials: DS
authors.lastname: Chung
authors.forename: Yun-Hi
authors.initials: YH
authors.lastname: Kim
authors.forename: Jong-Soo
authors.initials: JS
authors.lastname: Lee