Optical spectroscopy studies of Cu2ZnSnSe4 thin films

Yakushev, Michael, Forbes, Ian, Mudryi, Alexandre, Grossberg, Maarja, Krustok, Jüri, Beattie, Neil, Moynihan, Matthew, Rockett, A. and Martin, Robert (2015) Optical spectroscopy studies of Cu2ZnSnSe4 thin films. Thin Solid Films, 582. pp. 154-157. ISSN 0040-6090

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Official URL: http://dx.doi.org/10.1016/j.tsf.2014.09.010

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
Uncontrolled Keywords: Cu2ZnSnSe4; Thin films; Defects; Photoluminescence; Absorption
Subjects: F200 Materials Science
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Becky Skoyles
Date Deposited: 20 Apr 2015 08:49
Last Modified: 24 Oct 2017 08:52
URI: http://nrl.northumbria.ac.uk/id/eprint/22092

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