Radiative recombination in Cu2ZnSnSe4 thin films with Cu deficiency and Zn excess

Yakushev, M V and Márquez-Prieto, J and Forbes, I and Edwards, P R and Zhivulko, V D and Mudryi, A V and Krustok, J and Martin, R W (2015) Radiative recombination in Cu2ZnSnSe4 thin films with Cu deficiency and Zn excess. Journal of Physics D: Applied Physics, 48 (47). 475109. ISSN 0022-3727

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    Abstract

    Thin films of Cu2ZnSnSe4 (CZTSe) with copper de�ficiency and zinc excess were fabricated at Northumbria University by the selenisation of metallic precursors deposited on Mo/glass and bare glass substrates. Absorption and photoluminescence (PL) measurements were used to examine the �film on glass whereas fi�lms on Mo/glass were used to produce a solar cell with ef�ficiency of 8.1%. Detailed temperature and excitation intensity analysis of PL spectra allows identifi�cation of the main recombination mechanisms as band-to-tail and band-to-band transitions. The latter transition was observed in the spectra from 6 to 300 K.