Spatially-Resolved Photoluminescence Mapping of Single CdS Nanosheets

ORAL

Abstract

We present results of spatially-resolved low temperature photoluminescence of single 5 micron wide CdS nanosheets. The sheets, grown by pulsed laser deposition using vapor-phase transport, are uniform in size and shape and exhibit a hexagonal wurtzite structure. The orientation of the c-axis determined by PL polarization analysis and HR TEM varies from sheet to sheet. The spatially-resolved PL reveals spectral variation across the sheet, with A-like excitons at the edges showing a spectral peak at 2.547eV, and B like excitons at the center showing a peak at 2.563eV. Exciton lifetimes of $\sim $200 ps are observed, which are significantly longer than CdS nanowires of identical diameter, but shorter than measured in bulk CdS.

*Support provided by NSF (\#701703), Korea Research Foundation and KIST.

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Authors

  • Y.-J. Choi

    • KIST

  • M.A. Fickenscher

    • University of Cincinnati

  • T.B. Hoang

    • University of Cincinnati

  • L.V. Titova

    • University of Cincinnati

  • A. Mishra

    • University of Cincinnati

  • L.M. Smith

    • University of Cincinnati

  • H.E. Jackson

    • University of Cincinnati

  • J.M. Yarrison-Rice

    • Miami University

  • H. Rho

    • Chonbuk National University

  • H. Rho

    • Chonbuk National University

  • K.J. Choi

    • KIST

  • J.-G. Park

    • KIST