Proceedings of International Conference on Perovskite Thin Film Photovoltaics, Photonics and Optoelectronics (ABXPV18PEROPTO)
DOI: https://doi.org/10.29363/nanoge.abxpvperopto.2018.111
Publication date: 11th December 2017
Solution-processable metal halide perovskites show immense promise for use in photovoltaics and other optoelectronic applications. Expanding the perovskite family to materials with a range of different bandgaps is opening up the potential of this materials system for a range of different applications, including the design of tandem PV cells and other optoelectronic components such as lasers and light emitting diodes. Introducing a mixture of bromide and iodide in the halide composition allows tuning of the optical bandgap. However, these perovskites are not stable against phase segregation in the entire range of composition, which can affect measurements and performance when the material is photoexcited. In this work we studied photo-physical properties of novel mixed-halide perovskite systems using different characterization techniques. We conducted steady-state and transient studies, enabling determination of the mechanism of segregation and charge transport in mixed-halide perovskites. Our results demonstrate that charge transfer to iodide-rich domains happens in a very efficient way, and we observed a significant increase in PLQE in these mixed halide perovskites, in which almost all the recombination is radiative.
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