Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Publication date: 21st February 2018
Highly efficient perovskite devices have been demonstrated based on the mixed-cation lead mixed-halide perovskite system (FAPbI3) 1-x (MABr)x , as it allows for band gap tuning and optimisation of optoelectronic properties and stability [1][2]. However there is still much to elucidate regarding the microscopic properties of these materials that contribute to their elevated photovoltaic performance compared to single-cation perovskite systems. The mixed cation perovskite (FAPbI3) 0.85 (MABr)0.15 has been characterized through steady-state and time-resolved photoluminescence and through streak camera measurements, over a temperature range from 4 K to 330 K, in order to investigate phase behaviour and charge carrier dynamics in this material. Previous work on the widely studied perovskite MAPbI3 has shown that the monomolecular decay rate, which is attributed to trap-assisted recombination in such materials, decreases as the temperature is reduced due to the passivation of trap states, whereas the higher order bimolecular and Auger recombination rates increase [3]. Preliminary results show similar trends in the mixed-cation mixed-halide perovskite, but with some key differences in the dynamics within each structural phase. The data also provides experimental evidence for the phase transition temperatures of this mixed-cation perovskite system, with the tetragonal to cubic phase transition occurring below room temperature. [1] Jeon et al. Nature, 2015, 517, 476 [2] Baena et al. Energy Environ. Sci., 2015, 8, 2928 [3] Milot et al. Adv. Func. Mater., 2015, 25, 6218
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