Impact of the selenisation temperature on the structural and optical properties of CZTSe absorbers

Marquez Prieto, Jose, Yakushev, Michael, Forbes, Ian, Krustok, Jüri, Edwards, Paul, Zhivulko, Vadim, Borodavchenko, Olga, Mudryi, Alexandre, Dimitrievska, M., Izquerdo-Roca, V., Pearsall, Nicola and Martin, Robert (2016) Impact of the selenisation temperature on the structural and optical properties of CZTSe absorbers. Solar Energy Materials and Solar Cells, 152. pp. 42-50. ISSN 0927-0248

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Abstract

We present structural and optical spectroscopy studies of thin films of Cu2ZnSnSe4 (CZTSe) with strong copper deficiency deposited on Mo/Glass substrates and selenised at 450, 500 or 550 °C. Solar cells fabricated from these films demonstrated efficiencies up to 7.4% for selenisation at 500 °C. Structural analysis based on X-ray diffraction and Raman spectroscopy revealed the presence of SnSe2 in the film selenised at 450 °C but not in the films selenised at higher temperatures. A progressive decrease of the Sn and Se content was observed as the selenisation temperature increased. Photoluminescence excitation was used to determine the bandgaps at 4.2 K. Detailed measurements of the temperature and excitation intensity dependencies of the photoluminescence spectra allow the recombination mechanisms of the observed emission bands to be identified as band-to-impurity and band-to-band transitions, and their evolution with selenisation temperature changes to be analysed. The strongest band-to-band transition is recorded in the PL spectra of the film selenised at 500 °C and can be observed from 6 K to room temperature. The compositional and structural changes in the films and their influence on the optoelectronic properties of CZTSe and solar cells are discussed.

Item Type:	Article
Uncontrolled Keywords:	Cu2ZnSnSe4; Selenisation; Optical spectroscopy; Structure
Subjects:	H600 Electronic and Electrical Engineering
Department:	Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User:	Users 6424 not found.
Date Deposited:	28 Apr 2016 10:18
Last Modified:	12 Oct 2019 19:21
URI:	http://nrl.northumbria.ac.uk/id/eprint/26679

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