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Title: Structural Diversity in White-Light-Emitting Hybrid Lead Bromide Perovskites

Abstract

Hybrid organic–inorganic halide perovskites are under intense investigations because of their astounding physical properties and promises for optoelectronics. Lead bromide and chloride perovskites exhibit intrinsic white-light emission believed to arise from self-trapped excitons (STEs). Here, we report a series of new structurally diverse hybrid lead bromide perovskites that have broad-band emission at room temperature. They feature Pb/Br structures which vary from 1D face-sharing structures to 3D corner- and edge-sharing structures. Through single-crystal X-ray diffraction and low-frequency Raman spectroscopy, we have identified the local distortion level of the octahedral environments of Pb 2+ within the structures. The band gaps of these compounds range from 2.92 to 3.50 eV, following the trend of “corner-sharing < edge-sharing < face-sharing”. Density functional theory calculations suggest that the electronic structure is highly dependent on the connectivity mode of the PbBr 6 octahedra, where the edge- and corner-sharing 1D structure of (2,6-dmpz) 3Pb 2Br 10 exhibits more disperse bands and smaller band gap (2.49 eV) than the face-sharing 1D structure of (hep)PbBr 3 (3.10 eV). Using photoemission spectroscopy, we measured the energies of the valence band of these compounds and found them to remain almost constant, while the energy of conduction bands varies. Temperature-dependent PL measurementsmore » reveal that the 2D and 3D compounds have narrower PL emission at low temperature (~5 K), whereas the 1D compounds have both free exciton emission and STE emission. Furthermore, the 1D compound (2,6-dmpz) 3Pb 2Br 10 has the highest photoluminescence quantum yield of 12%, owing to its unique structure that allows efficient charge carrier relaxation and light emission.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [1]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [1]; ORCiD logo [1]
  1. Northwestern Univ., Evanston, IL (United States)
  2. Argonne National Lab. (ANL), Lemont, IL (United States)
  3. Univ Rennes, Rennes (France)
  4. Northwestern Univ., Evanston, IL (United States); Argonne National Lab. (ANL), Lemont, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF), Directorate for Geosciences Division of Earth Sciences (GEO/EAR)
OSTI Identifier:
1558000
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Journal of the American Chemical Society
Additional Journal Information:
Journal Volume: 140; Journal Issue: 40; Journal ID: ISSN 0002-7863
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English

Citation Formats

Mao, Lingling, Guo, Peijun, Kepenekian, Mikaël, Hadar, Ido, Katan, Claudine, Even, Jacky, Schaller, Richard D., Stoumpos, Constantinos C., and Kanatzidis, Mercouri G. Structural Diversity in White-Light-Emitting Hybrid Lead Bromide Perovskites. United States: N. p., 2018. Web. doi:10.1021/jacs.8b08691.
Mao, Lingling, Guo, Peijun, Kepenekian, Mikaël, Hadar, Ido, Katan, Claudine, Even, Jacky, Schaller, Richard D., Stoumpos, Constantinos C., & Kanatzidis, Mercouri G. Structural Diversity in White-Light-Emitting Hybrid Lead Bromide Perovskites. United States. doi:10.1021/jacs.8b08691.
Mao, Lingling, Guo, Peijun, Kepenekian, Mikaël, Hadar, Ido, Katan, Claudine, Even, Jacky, Schaller, Richard D., Stoumpos, Constantinos C., and Kanatzidis, Mercouri G. Thu . "Structural Diversity in White-Light-Emitting Hybrid Lead Bromide Perovskites". United States. doi:10.1021/jacs.8b08691. https://www.osti.gov/servlets/purl/1558000.
@article{osti_1558000,
title = {Structural Diversity in White-Light-Emitting Hybrid Lead Bromide Perovskites},
author = {Mao, Lingling and Guo, Peijun and Kepenekian, Mikaël and Hadar, Ido and Katan, Claudine and Even, Jacky and Schaller, Richard D. and Stoumpos, Constantinos C. and Kanatzidis, Mercouri G.},
abstractNote = {Hybrid organic–inorganic halide perovskites are under intense investigations because of their astounding physical properties and promises for optoelectronics. Lead bromide and chloride perovskites exhibit intrinsic white-light emission believed to arise from self-trapped excitons (STEs). Here, we report a series of new structurally diverse hybrid lead bromide perovskites that have broad-band emission at room temperature. They feature Pb/Br structures which vary from 1D face-sharing structures to 3D corner- and edge-sharing structures. Through single-crystal X-ray diffraction and low-frequency Raman spectroscopy, we have identified the local distortion level of the octahedral environments of Pb2+ within the structures. The band gaps of these compounds range from 2.92 to 3.50 eV, following the trend of “corner-sharing < edge-sharing < face-sharing”. Density functional theory calculations suggest that the electronic structure is highly dependent on the connectivity mode of the PbBr6 octahedra, where the edge- and corner-sharing 1D structure of (2,6-dmpz)3Pb2Br10 exhibits more disperse bands and smaller band gap (2.49 eV) than the face-sharing 1D structure of (hep)PbBr3 (3.10 eV). Using photoemission spectroscopy, we measured the energies of the valence band of these compounds and found them to remain almost constant, while the energy of conduction bands varies. Temperature-dependent PL measurements reveal that the 2D and 3D compounds have narrower PL emission at low temperature (~5 K), whereas the 1D compounds have both free exciton emission and STE emission. Furthermore, the 1D compound (2,6-dmpz)3Pb2Br10 has the highest photoluminescence quantum yield of 12%, owing to its unique structure that allows efficient charge carrier relaxation and light emission.},
doi = {10.1021/jacs.8b08691},
journal = {Journal of the American Chemical Society},
number = 40,
volume = 140,
place = {United States},
year = {2018},
month = {9}
}

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