Role of Dielectric Drag in Polaron Mobility in Lead Halide Perovskites

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

研究成果: Contribution to journalReview article査読

58 被引用数 (Scopus)

抄録

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.

本文言語英語
ページ(範囲)2555-2562
ページ数8
ジャーナルACS Energy Letters
2
11
DOI
出版ステータス出版済み - 11 10 2017
外部発表はい

All Science Journal Classification (ASJC) codes

  • 化学(その他)
  • 再生可能エネルギー、持続可能性、環境
  • 燃料技術
  • エネルギー工学および電力技術
  • 材料化学

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