Electron–phonon coupling in hybrid lead halide perovskites

Adam D. Wright, Carla Verdi, Rebecca L. Milot, Giles E. Eperon, Miguel A. Pérez-Osorio, Henry J. Snaith, Feliciano Giustino, Michael B. Johnston and Laura M. Herz ()
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Adam D. Wright: Clarendon Laboratory, University of Oxford
Carla Verdi: University of Oxford
Rebecca L. Milot: Clarendon Laboratory, University of Oxford
Giles E. Eperon: Clarendon Laboratory, University of Oxford
Miguel A. Pérez-Osorio: University of Oxford
Henry J. Snaith: Clarendon Laboratory, University of Oxford
Feliciano Giustino: University of Oxford
Michael B. Johnston: Clarendon Laboratory, University of Oxford
Laura M. Herz: Clarendon Laboratory, University of Oxford

Nature Communications, 2016, vol. 7, issue 1, 1-9

Abstract: Abstract Phonon scattering limits charge-carrier mobilities and governs emission line broadening in hybrid metal halide perovskites. Establishing how charge carriers interact with phonons in these materials is therefore essential for the development of high-efficiency perovskite photovoltaics and low-cost lasers. Here we investigate the temperature dependence of emission line broadening in the four commonly studied formamidinium and methylammonium perovskites, HC(NH2)2PbI3, HC(NH2)2PbBr3, CH3NH3PbI3 and CH3NH3PbBr3, and discover that scattering from longitudinal optical phonons via the Fröhlich interaction is the dominant source of electron–phonon coupling near room temperature, with scattering off acoustic phonons negligible. We determine energies for the interacting longitudinal optical phonon modes to be 11.5 and 15.3 meV, and Fröhlich coupling constants of ∼40 and 60 meV for the lead iodide and bromide perovskites, respectively. Our findings correlate well with first-principles calculations based on many-body perturbation theory, which underlines the suitability of an electronic band-structure picture for describing charge carriers in hybrid perovskites.

Date: 2016
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DOI: 10.1038/ncomms11755

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