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Enhanced Organo-Metal Halide Perovskite Photoluminescence from Nanosized Defect-Free Crystallites and Emitting Sites

Tian, Yuxi LU ; Merdasa, Aboma LU ; Unger, Eva LU ; Qenawy, Mohamed LU ; Zheng, Kaibo LU ; McKibbin, Sarah LU orcid ; Mikkelsen, Anders LU ; Pullerits, Tönu LU ; Yartsev, Arkady LU orcid and Sundström, Villy LU , et al. (2015) In The Journal of Physical Chemistry Letters 6(20). p.4171-4177
Abstract
Photoluminescence (PL) of organo-metal halide perovskite semiconductors can be enhanced by several orders of magnitude by exposure to visible light. We applied PL microscopy and super-resolution optical imaging to investigate this phenomenon with spatial resolution better than 10 nm using films of CH3NH3PbI3 prepared by the equimolar solution-deposition method, resulting in crystals of different sizes. We found that PL of similar to 100 nm crystals enhances much faster than that of larger, micrometer-sized ones. This crystal-size dependence of the photochemical light passivation of charge traps responsible for PL quenching allowed us to conclude that traps are present in the entire crystal volume rather than at the surface only. Because of... (More)
Photoluminescence (PL) of organo-metal halide perovskite semiconductors can be enhanced by several orders of magnitude by exposure to visible light. We applied PL microscopy and super-resolution optical imaging to investigate this phenomenon with spatial resolution better than 10 nm using films of CH3NH3PbI3 prepared by the equimolar solution-deposition method, resulting in crystals of different sizes. We found that PL of similar to 100 nm crystals enhances much faster than that of larger, micrometer-sized ones. This crystal-size dependence of the photochemical light passivation of charge traps responsible for PL quenching allowed us to conclude that traps are present in the entire crystal volume rather than at the surface only. Because of this effect, "dark" micrometer-sized perovskite crystals can be converted into highly luminescent smaller ones just by mechanical grinding. Super-resolution optical imaging shows spatial inhomogeneity of the PL intensity within perovskite crystals and the existence of <100 nm-sized localized emitting sites. The possible origin of these sites is discussed. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
The Journal of Physical Chemistry Letters
volume
6
issue
20
pages
4171 - 4177
publisher
The American Chemical Society (ACS)
external identifiers
  • wos:000363083900030
  • pmid:26722793
  • scopus:84944391421
  • pmid:26722793
ISSN
1948-7185
DOI
10.1021/acs.jpclett.5b02033
language
English
LU publication?
yes
additional info
The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Synchrotron Radiation Research (011013009), Chemical Physics (S) (011001060)
id
b290235b-289b-437f-9729-69a07e1e25c1 (old id 8198624)
date added to LUP
2016-04-01 14:11:05
date last changed
2024-01-10 00:14:11
@article{b290235b-289b-437f-9729-69a07e1e25c1,
  abstract     = {{Photoluminescence (PL) of organo-metal halide perovskite semiconductors can be enhanced by several orders of magnitude by exposure to visible light. We applied PL microscopy and super-resolution optical imaging to investigate this phenomenon with spatial resolution better than 10 nm using films of CH3NH3PbI3 prepared by the equimolar solution-deposition method, resulting in crystals of different sizes. We found that PL of similar to 100 nm crystals enhances much faster than that of larger, micrometer-sized ones. This crystal-size dependence of the photochemical light passivation of charge traps responsible for PL quenching allowed us to conclude that traps are present in the entire crystal volume rather than at the surface only. Because of this effect, "dark" micrometer-sized perovskite crystals can be converted into highly luminescent smaller ones just by mechanical grinding. Super-resolution optical imaging shows spatial inhomogeneity of the PL intensity within perovskite crystals and the existence of &lt;100 nm-sized localized emitting sites. The possible origin of these sites is discussed.}},
  author       = {{Tian, Yuxi and Merdasa, Aboma and Unger, Eva and Qenawy, Mohamed and Zheng, Kaibo and McKibbin, Sarah and Mikkelsen, Anders and Pullerits, Tönu and Yartsev, Arkady and Sundström, Villy and Scheblykin, Ivan}},
  issn         = {{1948-7185}},
  language     = {{eng}},
  number       = {{20}},
  pages        = {{4171--4177}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{The Journal of Physical Chemistry Letters}},
  title        = {{Enhanced Organo-Metal Halide Perovskite Photoluminescence from Nanosized Defect-Free Crystallites and Emitting Sites}},
  url          = {{http://dx.doi.org/10.1021/acs.jpclett.5b02033}},
  doi          = {{10.1021/acs.jpclett.5b02033}},
  volume       = {{6}},
  year         = {{2015}},
}