Lead halide perovskites: Crystal-liquid duality, phonon glass electron crystals, and large polaron formation

Kiyoshi Miyata, Timothy L. Atallah, X. Y. Zhu

Research output: Contribution to journalReview article

114 Citations (Scopus)

Abstract

Lead halide perovskites have been demonstrated as high performance materials in solar cells and light-emitting devices. These materials are characterized by coherent band transport expected from crystalline semiconductors, but dielectric responses and phonon dynamics typical of liquids. This “crystal-liquid” duality implies that lead halide perovskites belong to phonon glass electron crystals, a class of materials believed to make the most efficient thermoelectrics. We show that the crystal-liquid duality and the resulting dielectric response are responsible for large polaron formation and screening of charge carriers, leading to defect tolerance, moderate charge carrier mobility, and radiative recombination properties. Large polaron formation, along with the phonon glass character, may also explain the marked reduction in hot carrier cooling rates in these materials.

Original languageEnglish
Article numbere1701469
JournalScience Advances
Volume3
Issue number10
DOIs
Publication statusPublished - Jan 1 2017
Externally publishedYes

All Science Journal Classification (ASJC) codes

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