Optical spectroscopy studies of Cu2ZnSnSe4 thin films

Yakushev, M.V. and Forbes, I. and Mudryi, A.V. and Grossberg, M. and Krustok, J. and Beattie, N.S. and Moynihan, M. and Rockett, A. and Martin, R.W. (2015) Optical spectroscopy studies of Cu2ZnSnSe4 thin films. Thin Solid Films, 582. pp. 154-157. ISSN 0040-6090 (https://doi.org/10.1016/j.tsf.2014.09.010)

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Abstract

Cu2ZnSnSe4 thin films were synthesised by selenisation of magnetron sputtered metal precursors. The band gap determined from the absorption spectra increases from 1.01 eV at 300 K to 1.05 eV at 4.2 K. In lower quality films photoluminescence spectra show a broad, low intensity asymmetric band associated with a recombination of free electrons and holes localised on acceptors in the presence of spatial potential fluctuations. In high quality material the luminescence band becomes intense and narrow resolving two phonon replicas. Its shifts at changing excitation power suggest donor–acceptor pair recombination mechanisms. The proposed model involving two pairs of donors and acceptors is supported by the evolution of the band intensity and spectral position with temperature. Energy levels of the donors and acceptors are estimated using Arrhenius quenching analysis.

  • Item type:Article
    ID code:55983
    Dates:
    Date
    Event
    1 May 2015
    Published
    16 September 2014
    Published Online
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:22 Mar 2016 17:00
    Last modified:08 Apr 2024 22:29
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/55983
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