Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
DOI: https://doi.org/10.29363/nanoge.hopv.2020.188
Publication date: 6th February 2020
Mixed halide lead perovskites are good candidates for designing tandem solar cells because one can tune the bandgap by varying halide ion composition. For example, by varying the iodide/bromide composition (CH3NH3PbBrxI3-x (x=0 to 3)) it is possible to tune the bandgap between 1.55 eV and 2.43 eV. Of particular interest are the composition dependent absorption and emission properties. The halide ions are mobile both in the dark as well as under light irradiation. The photoluminescence and absorption spectra offer a convenient means to track the movement of halide ions. By employing gradient and homogeneous films of mixed halide perovskites we have probed the movement of iodide ions and factors influencing their mobility. The effect of halide ion segregation on the photovoltaic properties will also be discussed.
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