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Relating Defect Luminescence and Nonradiative Charge Recombination in MAPbI3 Perovskite Films

Dobrovolsky, Alexander LU ; Merdasa, Aboma ; Li, Jun LU orcid ; Hirselandt, Katrin ; Unger, Eva L. LU and Scheblykin, Ivan G. LU orcid (2020) In Journal of Physical Chemistry Letters 11(5). p.1714-1720
Abstract

Nonradiative losses in semiconductors are related to defects. At cryogenic temperatures, defect-related photoluminescence (PL) at energies lower than the band-edge PL is observed in methylammonium lead triiodide perovskite. We applied multispectral PL imaging to samples prepared by two different procedures and exhibiting 1 order of magnitude different PL quantum yield (PLQY). The high-PLQY sample showed concentration of the emitting defect sites around 1012-1013 cm-3. No correlation between PLQY and the relative intensity of the defect emission was found when micrometer-sized local regions of the same sample were compared. However, a clear positive correlation between the lower PLQY and higher defect... (More)

Nonradiative losses in semiconductors are related to defects. At cryogenic temperatures, defect-related photoluminescence (PL) at energies lower than the band-edge PL is observed in methylammonium lead triiodide perovskite. We applied multispectral PL imaging to samples prepared by two different procedures and exhibiting 1 order of magnitude different PL quantum yield (PLQY). The high-PLQY sample showed concentration of the emitting defect sites around 1012-1013 cm-3. No correlation between PLQY and the relative intensity of the defect emission was found when micrometer-sized local regions of the same sample were compared. However, a clear positive correlation between the lower PLQY and higher defect emission was observed when two preparation methods were contrasted. Therefore, although the emissive defects are not connected directly with the nonradiative centers and may be spatially separated at the nano scale, chemical processes during the perovskite synthesis promote/prevent formation of both types of defects at the same time.

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author
; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physical Chemistry Letters
volume
11
issue
5
pages
7 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85080065194
  • pmid:32036661
ISSN
1948-7185
DOI
10.1021/acs.jpclett.9b03878
language
English
LU publication?
yes
id
260f93fd-0109-41de-971b-657dd4a6353d
date added to LUP
2021-01-12 11:16:55
date last changed
2024-05-30 03:35:15
@article{260f93fd-0109-41de-971b-657dd4a6353d,
  abstract     = {{<p>Nonradiative losses in semiconductors are related to defects. At cryogenic temperatures, defect-related photoluminescence (PL) at energies lower than the band-edge PL is observed in methylammonium lead triiodide perovskite. We applied multispectral PL imaging to samples prepared by two different procedures and exhibiting 1 order of magnitude different PL quantum yield (PLQY). The high-PLQY sample showed concentration of the emitting defect sites around 10<sup>12</sup>-10<sup>13</sup> cm<sup>-3</sup>. No correlation between PLQY and the relative intensity of the defect emission was found when micrometer-sized local regions of the same sample were compared. However, a clear positive correlation between the lower PLQY and higher defect emission was observed when two preparation methods were contrasted. Therefore, although the emissive defects are not connected directly with the nonradiative centers and may be spatially separated at the nano scale, chemical processes during the perovskite synthesis promote/prevent formation of both types of defects at the same time.</p>}},
  author       = {{Dobrovolsky, Alexander and Merdasa, Aboma and Li, Jun and Hirselandt, Katrin and Unger, Eva L. and Scheblykin, Ivan G.}},
  issn         = {{1948-7185}},
  language     = {{eng}},
  month        = {{03}},
  number       = {{5}},
  pages        = {{1714--1720}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{Journal of Physical Chemistry Letters}},
  title        = {{Relating Defect Luminescence and Nonradiative Charge Recombination in MAPbI<sub>3</sub> Perovskite Films}},
  url          = {{http://dx.doi.org/10.1021/acs.jpclett.9b03878}},
  doi          = {{10.1021/acs.jpclett.9b03878}},
  volume       = {{11}},
  year         = {{2020}},
}