Proceedings of nanoGe Fall Meeting 2018 (NFM18)
DOI: https://doi.org/10.29363/nanoge.nfm.2018.252
Publication date: 6th July 2018
Metal-halide perovskites are promising materials for opto-electronic applications. Their mechanical and electronic properties are directly connected to the nature of their lattice vibrations. Whereas the mid infrared (IR) range contains mainly information on the internal vibrations of the methylammonium cation, the lead-halide lattice vibrations are located in the far IR.
We will report far-IR spectroscopy measurements of lead halide perovskite thin films and single crystals at room temperature and a detailed quantitative analysis of the spectra.1 We find strong broadening and anharmonicity of the lattice vibrations for all three halide perovskites. We determine the frequencies of both the transversal and longitudinal optical phonons, and use them to calculate the static dielectric constants, polaron masses, and upper limits for the phonon-scattering limited charge carrier mobilities. Furthermore, we compare our experimental results to molecular dymanics simulations of lead halide perovskites. Our findings are important for the basic understanding of charge transport processes and mechanical properties in metal halide perovskites.
(1) Sendner, M.; Nayak, P. K.; Egger, D. A.; Beck, S.; Müller, C.; Epding, B.; Kowalsky, W.; Kronik, L.; Snaith, H. J.; Pucci, A.; Lovrincic, R. Optical Phonons in Methylammonium Lead Halide Perovskites and Implications for Charge Transport. Mater Horiz 2016, 3 (6), 613–620.
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