Low-frequency optical phonon modes and carrier mobility in the halide perovskite CH3NH3PbBr3 using terahertz time-domain spectroscopy

Daming Zhao, Jonathan M. Skelton, Hongwei Hu, Chan La-O-Vorakiat, Jian Xin Zhu, Rudolph A. Marcus, Maria Elisabeth Michel-Beyerle, Yeng Ming Lam, Aron Walsh, Elbert E.M. Chia

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Abstract

As a light absorber in photovoltaic applications, hybrid organic-inorganic halide perovskites should have long and balanced diffusion lengths for both the separated electrons and holes before recombination, which necessitates high carrier mobility. In polar semiconductors, the roomerature carrier mobility is often limited by the scattering between carriers and the lowest-frequency optical phonon modes. Using terahertz time-domain spectroscopy, we examine the temperature evolution of these phonon modes in CH3NH3PbBr3 and obtained high carrier mobility values using Feynman's polaron theory. This method allows us to estimate the upper limit of carrier mobilities without the need to create photogenerated free carriers, and can be applied to other heteropolar semiconductor systems with large polarons.

Original languageEnglish
Article number201903
JournalApplied Physics Letters
Volume111
Issue number20
DOIs
Publication statusPublished - 2017 Nov 13

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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    Zhao, D., Skelton, J. M., Hu, H., La-O-Vorakiat, C., Zhu, J. X., Marcus, R. A., Michel-Beyerle, M. E., Lam, Y. M., Walsh, A., & Chia, E. E. M. (2017). Low-frequency optical phonon modes and carrier mobility in the halide perovskite CH3NH3PbBr3 using terahertz time-domain spectroscopy. Applied Physics Letters, 111(20), [201903]. https://doi.org/10.1063/1.4993524