Role of Dielectric Drag in Polaron Mobility in Lead Halide Perovskites

Mischa Bonn, Kiyoshi Miyata, Euan Hendry, X. Y. Zhu

Research output: Contribution to journalReview article

40 Citations (Scopus)

Abstract

Hybrid organic-inorganic lead halide perovskites (HOIPs) have attracted much attention because of their remarkable carrier lifetimes and diffusion lengths. These properties have been attributed to the efficient screening of charge carriers via polaron formation in the highly polar and dynamic environment. Polaron formation explains, at least in part, the moderate charge carrier mobility, but the calculated mobilities are somewhat higher than experimental values. Here we discuss a factor that has been previously overlooked and can potentially account for the discrapency: the effect of dielectric drag. While optical phonon modes of the lead halide sublattice are mainly responsible for polaron formation, slower orientational relaxation of surrounding dipoles adds a dielectric drag to the moving charge. We discuss the role of this dielectric drag based on the measured dielectric function in the gigahertz to terahertz frequency range and how we can understand the unique carrier physics in HOIPs in view of its crystal-liquid duality.

Original languageEnglish
Pages (from-to)2555-2562
Number of pages8
JournalACS Energy Letters
Volume2
Issue number11
DOIs
Publication statusPublished - Nov 10 2017
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Chemistry (miscellaneous)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Materials Chemistry

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