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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 ; Mikkelsen, Anders LU ; Pullerits, Tönu LU ; Yartsev, Arkady LU 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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publication status
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The Journal of Physical Chemistry Letters
volume
6
issue
20
pages
4171 - 4177
publisher
The American Chemical Society
external identifiers
  • wos:000363083900030
  • pmid:26722793
  • scopus:84944391421
ISSN
1948-7185
DOI
10.1021/acs.jpclett.5b02033
language
English
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yes
id
b290235b-289b-437f-9729-69a07e1e25c1 (old id 8198624)
date added to LUP
2015-11-26 11:06:26
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2017-11-05 04:07:11
@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},
  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},
  volume       = {6},
  year         = {2015},
}