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Title: Excitations Partition into Two Distinct Populations in Bulk Perovskites

Abstract

Abstract Organolead halide perovskites convert optical excitations to charge carriers with remarkable efficiency in optoelectronic devices. Previous research predominantly documents dynamics in perovskite thin films; however, extensive disorder in this platform may obscure the observed carrier dynamics. Here, carrier dynamics in perovskite single‐domain single crystals is examined by performing transient absorption spectroscopy in a transmissive geometry. Two distinct sets of carrier populations that coexist at the same radiation fluence, but display different decay dynamics, are observed: one dominated by second‐order recombination and the other by third‐order recombination. Based on ab initio simulations, this observation is found to be most consistent with the hypothesis that free carriers and localized carriers coexist due to polaron formation. The calculations suggest that polarons will form in both CH 3 NH 3 PbBr 3 and CH 3 NH 3 PbI 3 crystals, but that they are more pronounced in CH 3 NH 3 PbBr 3 . Single‐crystal CH 3 NH 3 PbBr 3 could represent the key to understanding the impact of polarons on the transport properties of perovskite optoelectronic devices.

Authors:
 [1];  [2];  [3];  [1];  [1];  [1];  [4];  [5]; ORCiD logo [1]
  1. Univ. of Chicago, IL (United States). James Franck Inst., and Inst. for Biophysical Dynamics
  2. Univ. of Chicago, IL (United States). Inst. for Molecular Engineering
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
  4. Argonne National Lab. (ANL), Argonne, IL (United States).Chemical Sciences and Engineering Division
  5. Univ. of Chicago, IL (United States). Inst. for Molecular Engineering; Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
Publication Date:
Research Org.:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Org.:
Alfred P. Sloan Foundation; National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES); U.S. Department of Defense (DOD). National Security Science and Engineering Faculty Fellowship (NSSEFF)
OSTI Identifier:
1427475
Alternate Identifier(s):
OSTI ID: 1416406
Grant/Contract Number:  
AC02-06CH11357; DE‐AC02‐06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Advanced Optical Materials
Additional Journal Information:
Journal Volume: 6; Journal Issue: 5; Journal ID: ISSN 2195-1071
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; organolead halide perovskites; bulk carrier dynamics; transient absorption; polaron formation

Citation Formats

Wang, Lili, Brawand, Nicholas P., Voros, Marton, Dahlberg, Peter D., Otto, John P., Williams, Nicholas E., Tiede, David M., Galli, Giulia, and Engel, Gregory S. Excitations Partition into Two Distinct Populations in Bulk Perovskites. United States: N. p., 2018. Web. doi:10.1002/adom.201700975.
Wang, Lili, Brawand, Nicholas P., Voros, Marton, Dahlberg, Peter D., Otto, John P., Williams, Nicholas E., Tiede, David M., Galli, Giulia, & Engel, Gregory S. Excitations Partition into Two Distinct Populations in Bulk Perovskites. United States. https://doi.org/10.1002/adom.201700975
Wang, Lili, Brawand, Nicholas P., Voros, Marton, Dahlberg, Peter D., Otto, John P., Williams, Nicholas E., Tiede, David M., Galli, Giulia, and Engel, Gregory S. Tue . "Excitations Partition into Two Distinct Populations in Bulk Perovskites". United States. https://doi.org/10.1002/adom.201700975. https://www.osti.gov/servlets/purl/1427475.
@article{osti_1427475,
title = {Excitations Partition into Two Distinct Populations in Bulk Perovskites},
author = {Wang, Lili and Brawand, Nicholas P. and Voros, Marton and Dahlberg, Peter D. and Otto, John P. and Williams, Nicholas E. and Tiede, David M. and Galli, Giulia and Engel, Gregory S.},
abstractNote = {Abstract Organolead halide perovskites convert optical excitations to charge carriers with remarkable efficiency in optoelectronic devices. Previous research predominantly documents dynamics in perovskite thin films; however, extensive disorder in this platform may obscure the observed carrier dynamics. Here, carrier dynamics in perovskite single‐domain single crystals is examined by performing transient absorption spectroscopy in a transmissive geometry. Two distinct sets of carrier populations that coexist at the same radiation fluence, but display different decay dynamics, are observed: one dominated by second‐order recombination and the other by third‐order recombination. Based on ab initio simulations, this observation is found to be most consistent with the hypothesis that free carriers and localized carriers coexist due to polaron formation. The calculations suggest that polarons will form in both CH 3 NH 3 PbBr 3 and CH 3 NH 3 PbI 3 crystals, but that they are more pronounced in CH 3 NH 3 PbBr 3 . Single‐crystal CH 3 NH 3 PbBr 3 could represent the key to understanding the impact of polarons on the transport properties of perovskite optoelectronic devices.},
doi = {10.1002/adom.201700975},
journal = {Advanced Optical Materials},
number = 5,
volume = 6,
place = {United States},
year = {Tue Jan 09 00:00:00 EST 2018},
month = {Tue Jan 09 00:00:00 EST 2018}
}

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Cited by: 6 works
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Figures / Tables:

Figure 1 Figure 1: Characterization of CH3NH3PbBr3 single crystals. a, Linear absorption spectrum of CH3NH3PbBr3 single-domain single crystal. Inset: Micrograph of a polished single-domain single crystal with 500 μm scale bar. b, Upper: Experimental powder X-ray diffraction (XRD) pattern of the ground powder of several crystals. Lower: Simulated powder XRD pattern basedmore » on single crystal XRD measurement (Table S1 in the SI). c, Photoluminescence (PL) spectra of a perovskite single-domain single crystal measured in a reflective geometry with 532 nm excitation (gray) and a transmissive geometry with 535 nm excitation (black). The spectral dip at 532 nm in the reflective PL data is caused by a 532 nm notch filter.« less

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Works referencing / citing this record:

Structural fluctuations cause spin-split states in tetragonal (CH 3 NH 3 )PbI 3 as evidenced by the circular photogalvanic effect
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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.