Electron–phonon coupling in hybrid lead halide perovskites

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…

• GF
  Graphene Flagship

  Award: 604391
• LT
  Leverhulme Trust

  Award: RL-2012-001
• UO
  University of Oxford
• EA
  Engineering and Physical Sciences Research Council

  Awards: EP/G049653/1, EP/L024667/1, EP/J009857/1, EP/M020517/1, EP/L016702/1, EP/M020517/1, EP/J009857/1, EP/M020517, L016702/1