Halide Ion Migration in Mixed Halide Lead Perovskites
Prashant V. Kamat a b, Rebecca Scheidt a b, Gergely Samu a b, Csaba Janaky a b
a Radiation Laboratory, Department of Chemistry & Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, EE. UU., Notre Dame, United States
b Department of Physical Chemistry and Materials Science, University of Sezged, Szeged, HUNGARY
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Roma, Italy, 2019 May 12th - 15th
Organizers: Prashant Kamat, Filippo De Angelis and Aldo Di Carlo
Invited Speaker, Prashant V. Kamat, presentation 188
DOI: https://doi.org/10.29363/nanoge.hopv.2019.188
Publication date: 11th February 2019

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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