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Title: Inversion symmetry and bulk Rashba effect in methylammonium lead iodide perovskite single crystals

Abstract

Methylammonium lead iodide perovskite (MAPbI 3) exhibits long charge carrier lifetimes that are linked to its high efficiency in solar cells. Yet, the mechanisms governing these unusual carrier dynamics are not completely understood. A leading hypothesis-disproved in this work-is that a large, static bulk Rashba effect slows down carrier recombination. Here, using second harmonic generation rotational anisotropy measurements on MAPbI 3 crystals, we demonstrate that the bulk structure of tetragonal MAPbI 3 is centrosymmetric with I4/ mcm space group. Our calculations show that a significant Rashba splitting in the bandstructure requires a non-centrosymmetric lead iodide framework, and that incorrect structural relaxations are responsible for the previously predicted large Rashba effect. The small Rashba splitting allows us to compute effective masses in excellent agreement with experiment. Here, our findings rule out the presence of a large static Rashba effect in bulk MAPbI 3, and our measurements find no evidence of dynamic Rashba effects.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [2];  [3];  [4];  [4];  [4];  [3];  [2];  [2]
  1. California Inst. of Technology (CalTech), Pasadena, CA (United States); Trinity College Dublin, Dublin (Ireland)
  2. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  3. King Abdullah Univ. of Science and Technology (KAUST), Thuwal (Saudi Arabia)
  4. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1460353
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 9; Journal Issue: 1; Related Information: © 2018 The Author(s).; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Frohna, Kyle, Deshpande, Tejas, Harter, John, Peng, Wei, Barker, Bradford A., Neaton, Jeffrey B., Louie, Steven G., Bakr, Osman M., Hsieh, David, and Bernardi, Marco. Inversion symmetry and bulk Rashba effect in methylammonium lead iodide perovskite single crystals. United States: N. p., 2018. Web. doi:10.1038/s41467-018-04212-w.
Frohna, Kyle, Deshpande, Tejas, Harter, John, Peng, Wei, Barker, Bradford A., Neaton, Jeffrey B., Louie, Steven G., Bakr, Osman M., Hsieh, David, & Bernardi, Marco. Inversion symmetry and bulk Rashba effect in methylammonium lead iodide perovskite single crystals. United States. doi:10.1038/s41467-018-04212-w.
Frohna, Kyle, Deshpande, Tejas, Harter, John, Peng, Wei, Barker, Bradford A., Neaton, Jeffrey B., Louie, Steven G., Bakr, Osman M., Hsieh, David, and Bernardi, Marco. Tue . "Inversion symmetry and bulk Rashba effect in methylammonium lead iodide perovskite single crystals". United States. doi:10.1038/s41467-018-04212-w. https://www.osti.gov/servlets/purl/1460353.
@article{osti_1460353,
title = {Inversion symmetry and bulk Rashba effect in methylammonium lead iodide perovskite single crystals},
author = {Frohna, Kyle and Deshpande, Tejas and Harter, John and Peng, Wei and Barker, Bradford A. and Neaton, Jeffrey B. and Louie, Steven G. and Bakr, Osman M. and Hsieh, David and Bernardi, Marco},
abstractNote = {Methylammonium lead iodide perovskite (MAPbI3) exhibits long charge carrier lifetimes that are linked to its high efficiency in solar cells. Yet, the mechanisms governing these unusual carrier dynamics are not completely understood. A leading hypothesis-disproved in this work-is that a large, static bulk Rashba effect slows down carrier recombination. Here, using second harmonic generation rotational anisotropy measurements on MAPbI3 crystals, we demonstrate that the bulk structure of tetragonal MAPbI3 is centrosymmetric with I4/mcm space group. Our calculations show that a significant Rashba splitting in the bandstructure requires a non-centrosymmetric lead iodide framework, and that incorrect structural relaxations are responsible for the previously predicted large Rashba effect. The small Rashba splitting allows us to compute effective masses in excellent agreement with experiment. Here, our findings rule out the presence of a large static Rashba effect in bulk MAPbI3, and our measurements find no evidence of dynamic Rashba effects.},
doi = {10.1038/s41467-018-04212-w},
journal = {Nature Communications},
number = 1,
volume = 9,
place = {United States},
year = {2018},
month = {5}
}

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Cited by: 18 works
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