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Title: Direct Observation of Halide Migration and its Effect on the Photoluminescence of Methylammonium Lead Bromide Perovskite Single Crystals

Journal Article · · Advanced Materials
 [1];  [1];  [2];  [1];  [3];  [1];  [2]; ORCiD logo [1]
  1. Univ. of California, San Diego, CA (United States). Dept. of Nanoengineering
  2. FOM Inst. for Atomic and Molecular Physics (AMOLF), Amsterdam (Netherlands). Center for Nanophotonics
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Optoelectronic devices based on hybrid perovskites have demonstrated outstanding performance within a few years of intense study. However, commercialization of these devices requires barriers to their development to be overcome, such as their chemical instability under operating conditions. In order to investigate this instability and its consequences, the electric field applied to single crystals of methylammonium lead bromide (CH3NH3PbBr3) is varied, and changes are mapped in both their elemental composition and photo-luminescence. Synchrotron-based nanoprobe X-ray fluorescence (nano-XRF) with 250 nm resolution reveals quasi-reversible field-assisted halide migration, with corresponding changes in photoluminescence. It is observed that higher local bromide concentration is correlated to superior optoelectronic performance in CH3NH3PbBr3. A lower limit on the electromigration rate is calculated from these experiments and the motion is interpreted as vacancy-mediated migration based on nudged elastic band density functional theory (DFT) simulations. The XRF mapping data provide direct evidence of field-assisted ionic migration in a model hybrid-perovskite thin single crystal, while the link with photoluminescence proves that the halide stoichiometry plays a key role in the optoelectronic properties of the perovskite.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; Netherlands Organization for Scientific Research (NWO); European Research Council (ERC); Koninklijke Philips N.V., Amsterdam (Netherlands); National Science Foundation (NSF)
Contributing Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Grant/Contract Number:
AC02-06CH11357; FP/2007‐2013; 337328; SC0012118; ACI‐1053575
OSTI ID:
1468624
Alternate ID(s):
OSTI ID: 1395604
Journal Information:
Advanced Materials, Vol. 29, Issue 43; ISSN 0935-9648
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 71 works
Citation information provided by
Web of Science

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Ferroelectricity-free lead halide perovskites journal January 2019
Spin-Coated CH3NH3PbBr3 Film Consisting of Micron-Scale Single Crystals Assisted with a Benzophenone Crystallizing Agent and Its Application in Perovskite Light-Emitting Diodes journal October 2018
Halide lead perovskites for ionizing radiation detection journal March 2019
Enhanced On–Off Ratio Photodetectors Based on Lead‐Free Cs 3 Bi 2 I 9 Single Crystal Thin Films journal February 2020
Recent Advances in Energetics and Stability of Metal Halide Perovskites for Optoelectronic Applications journal December 2018
X‐Ray Microscopy of Halide Perovskites: Techniques, Applications, and Prospects journal January 2020
Progress of Surface Science Studies on ABX 3 ‐Based Metal Halide Perovskite Solar Cells journal April 2020
Reactions at noble metal contacts with methylammonium lead triiodide perovskites: Role of underpotential deposition and electrochemistry journal April 2019
The Role of the Interfaces in Perovskite Solar Cells journal November 2019
High‐Performance Solution‐Processed Organo‐Metal Halide Perovskite Unipolar Resistive Memory Devices in a Cross‐Bar Array Structure journal April 2019
Quantifying mobile ions and electronic defects in perovskite-based devices with temperature-dependent capacitance measurements: Frequency vs time domain journal January 2020
The Relationship between Chemical Flexibility and Nanoscale Charge Collection in Hybrid Halide Perovskites journal March 2018
Halide lead perovskites for ionizing radiation detection text January 2019
Enabling Self-passivation by Attaching Small Grains on Surfaces of Large Grains toward High-Performance Perovskite LEDs journal September 2019
Perovskite Nanowire Extrusion journal October 2017
Emergence of multiple fluorophores in individual cesium lead bromide nanocrystals journal July 2019
CH3NH3Br solution as a novel platform for the selective fluorescence detection of Pb2+ ions journal November 2019