Phonon-Electron Scattering Limits Free Charge Mobility in Methylammonium Lead Iodide Perovskites

Søren A. Jensen^a, Francesco D'Angelo^a, Dmitry Turchinovich^a, Mischa Bonn^a, Enrique Cánovas^a, Melike Karakus^a

^aMax Planck Institute for Polymer Research, Mainz, Ackermannweg, 10, Mainz, Germany

Materials for Sustainable Development Conference (MATSUS)
Proceedings of September Meeting 2016 (NFM16)

Berlin, Germany, 2016 September 5th - 13th

Organizers: Marin Alexe, Enrique Cánovas, Celso de Mello Donega, Ivan Infante, Thomas Kirchartz, Maksym Kovalenko, Federico Rosei, Lukas Schmidt-Mende, Laurens Siebbeles, Peter Strasser, Teodor K Todorov, Roel van de Krol and Ulrike Woggon

Poster, Melike Karakus, 404
Publication date: 14th June 2016

The nature of the photoconductivity in solution-processed films of methylammonium lead iodide perovskite is investigated by determining the variation of the material response with temperature. Ultra-broadband Terahertz (THz) photoconductivity spectra in the 0.3-12 THz range can be reproduced well by a simple Drude-like response, where free charge carrier motion is characterized by an average scattering time. The scattering time increases from ~4 fs at 300 K (tetragonal phase; mobility of ~27 cm2 V-1 s-1) to almost ~25 fs at 77 K (orthorhombic phase, mobility of ~150 cm2 V-1 s-1). For the tetragonal phase (temperature range 150 < T <300 K) the scattering time shows a ~T-3/2 dependence, approaching the theoretical limit for pure acoustic phonon (deformation potential) scattering. Hence, electron-phonon, rather than impurity scattering, set the upper limit mechanism limiting free charge transport for this perovskite.

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