TY - JOUR
T1 - Lead halide perovskites
T2 - Crystal-liquid duality, phonon glass electron crystals, and large polaron formation
AU - Miyata, Kiyoshi
AU - Atallah, Timothy L.
AU - Zhu, X. Y.
N1 - Funding Information:
X.-Y.Z. thanks V. Podzorov, S. Jin, and F. De Angelis for fruitful collaborations; X. Roy, M. Bonn, A. Walsh, and J. Frost for insightful discussions; and D. Niesner, X. Wu, H. Zhu, M. Tuan Trinh, J. Wang, and P. Joshi for the experimental work, which precipitated the ideas presented here. Funding: X.-Y.Z. acknowledges the NSF (grant DMR 1420634) (Materials Research Science and Engineering Center) for support during the writing of this perspective. The experimental works presented in Figs. 3 and 6 to 9 were supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences (grant ER46980). K.M. acknowledges the financial support of the Japan Society for the Promotion of Science. Author contributions: K.M., T.L.A., and X.-Y.Z. contributed to the reviewing of literature and writing of this perspective. Competing interests: The authors declare that they have no competing interests. Data and materials availability: All data needed to evaluate the conclusions in the paper are present in the paper. Additional data related to this paper may be requested from the authors.
Publisher Copyright:
Copyright © 2017 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science.
PY - 2017
Y1 - 2017
N2 - 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.
AB - 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.
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U2 - 10.1126/sciadv.1701469
DO - 10.1126/sciadv.1701469
M3 - Review article
C2 - 29043296
AN - SCOPUS:85033447331
SN - 2375-2548
VL - 3
JO - Science Advances
JF - Science Advances
IS - 10
M1 - e1701469
ER -