Ultraviolet-Infrared dual band detector using ZnO/PbS composite nanostructure

ORAL

Abstract

Sensors for detecting ultraviolet (UV) and near-infrared (NIR) photons, fabricated by complex epitaxial methods are costly. A low cost UV-NIR detector is fabricated using ZnO nonporous powder and PbS quantum size particles is demonstrated. A nonporous film of ZnO was fabricated on Fluorine doped Tin Oxide (FTO) glass with a scribe, separating the FTO layer in to two electrodes. PbS quantum particles were composites on the ZnO film by wetting the film using a solution of lead acetate in ethanol and passing a stream of H$_{2}$S gas on top of the film. When a bias voltage is applied across the electrodes the device shows two response peaks, around 380nm (UV) and 800nm (NIR). These two responses are resulted due to bandgap excitation of ZnO ($\sim $3.2 eV) and PbS ($\sim $0.9 eV) quantum particles.

*Acknowledgements to the US NSF grant \# ECS-0553051, US Army grant \# W911NF-08-1-0448 and Georgia research alliance grant GRAUP.

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Authors

  • P.K.D.D.P. Pitigala

    • Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303, USA

  • P.V.V. Jayaweera

    • Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303, USA

  • J. Shao

    • Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303, USA

  • K. Tennakone

    • Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303, USA

  • A.G.U. Perera

    • Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303, USA
    • Dept of Physics and Astronomy, Georgia State University
    • Department of Physics and Astronomy, Georgia State University, Atlanta, GA-30303, USA
    • Georgia State University

  • P.M. Jayaweera

    • Department of Chemistry, University of Sri Jayewardenepura, Nugegoda, Sri Lanka

  • J. Baltrusaitis

    • Central Microscopy Research Facility, University of Iowa, Iowa City, Iowa 52242, USA