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Ion Migration Heals Trapping Centers in CH3NH3PbBr3 Perovskite

Ghosh, Supriya ; Pal, Suman, Kalyan; Karki, Khadga Jung LU and Pullerits, Tönu LU (2017) In ACS Energy Letters 2(9). p.2133-2139
Abstract
We investigate the local changes in photophysics at different microregions of a methylammonium lead bromide (MAPbBr3) perovskite crystal under illumination. Our results show that the emission from the structurally homogeneous region is blue-shifted compared to the emission from the inhomogeneous regions. The yield and spectrum of the emission from the structurally homogeneous region do not vary with the illumination time, whereas distinct light-induced changes are seen in the spectra from the inhomogeneous region. The changes in the spectra at long illumination time suggest that ion-migration inhibits the emission from the inhomogeneous regions. The measurements of the emission lifetime suggest that the emission from the inhomogeneous... (More)
We investigate the local changes in photophysics at different microregions of a methylammonium lead bromide (MAPbBr3) perovskite crystal under illumination. Our results show that the emission from the structurally homogeneous region is blue-shifted compared to the emission from the inhomogeneous regions. The yield and spectrum of the emission from the structurally homogeneous region do not vary with the illumination time, whereas distinct light-induced changes are seen in the spectra from the inhomogeneous region. The changes in the spectra at long illumination time suggest that ion-migration inhibits the emission from the inhomogeneous regions. The measurements of the emission lifetime suggest that the emission from the inhomogeneous regions is dominated by the defect-related emission at short illumination times and the band-to-band emission at the longer illumination times. Our work provides direct evidence for the light-induced healing of the defect centers, which is important in the design of photoactive devices of MAPbBr3. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
ACS Energy Letters
volume
2
issue
9
pages
2133 - 2139
external identifiers
  • scopus:85033681815
  • wos:000410600500027
ISSN
2380-8195
DOI
10.1021/acsenergylett.7b00577
language
English
LU publication?
yes
id
811d660b-cae4-48bc-9728-9abda70419b4
date added to LUP
2017-10-25 14:22:46
date last changed
2018-01-16 13:24:04
@article{811d660b-cae4-48bc-9728-9abda70419b4,
  abstract     = {We investigate the local changes in photophysics at different microregions of a methylammonium lead bromide (MAPbBr3) perovskite crystal under illumination. Our results show that the emission from the structurally homogeneous region is blue-shifted compared to the emission from the inhomogeneous regions. The yield and spectrum of the emission from the structurally homogeneous region do not vary with the illumination time, whereas distinct light-induced changes are seen in the spectra from the inhomogeneous region. The changes in the spectra at long illumination time suggest that ion-migration inhibits the emission from the inhomogeneous regions. The measurements of the emission lifetime suggest that the emission from the inhomogeneous regions is dominated by the defect-related emission at short illumination times and the band-to-band emission at the longer illumination times. Our work provides direct evidence for the light-induced healing of the defect centers, which is important in the design of photoactive devices of MAPbBr3.},
  author       = {Ghosh, Supriya  and Pal, Suman, Kalyan and Karki, Khadga Jung and Pullerits, Tönu},
  issn         = {2380-8195},
  language     = {eng},
  month        = {08},
  number       = {9},
  pages        = {2133--2139},
  series       = {ACS Energy Letters},
  title        = {Ion Migration Heals Trapping Centers in CH3NH3PbBr3 Perovskite},
  url          = {http://dx.doi.org/10.1021/acsenergylett.7b00577},
  volume       = {2},
  year         = {2017},
}