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Defect-induced local variation of crystal phase transition temperature in metal-halide perovskites

Dobrovolsky, Alexander LU ; Merdasa, Aboma LU ; Unger, Eva L. LU ; Yartsev, Arkady LU and Scheblykin, Ivan G. LU (2017) In Nature Communications 8(1).
Abstract

Solution-processed organometal halide perovskites are hybrid crystalline semiconductors highly interesting for low-cost and efficient optoelectronics. Their properties are dependent on the crystal structure. Literature shows a variety of crystal phase transition temperatures and often a spread of the transition over tens of degrees Kelvin. We explain this inconsistency by demonstrating that the temperature of the tetragonal-to-orthorhombic phase transition in methylammonium lead triiodide depends on the concentration and nature of local defects. Phase transition in individual nanowires was studied by photoluminescence microspectroscopy and super-resolution imaging. We propose that upon cooling from 160 to 140 K, domains of the crystal... (More)

Solution-processed organometal halide perovskites are hybrid crystalline semiconductors highly interesting for low-cost and efficient optoelectronics. Their properties are dependent on the crystal structure. Literature shows a variety of crystal phase transition temperatures and often a spread of the transition over tens of degrees Kelvin. We explain this inconsistency by demonstrating that the temperature of the tetragonal-to-orthorhombic phase transition in methylammonium lead triiodide depends on the concentration and nature of local defects. Phase transition in individual nanowires was studied by photoluminescence microspectroscopy and super-resolution imaging. We propose that upon cooling from 160 to 140 K, domains of the crystal containing fewer defects stay in the tetragonal phase longer than highly defected domains that readily transform to the high bandgap orthorhombic phase at higher temperatures. The existence of relatively pure tetragonal domains during the phase transition leads to drastic photoluminescence enhancement, which is inhomogeneously distributed across perovskite microcrystals.

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organization
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type
Contribution to journal
publication status
published
subject
in
Nature Communications
volume
8
issue
1
publisher
Nature Publishing Group
external identifiers
  • scopus:85021655170
ISSN
2041-1723
DOI
10.1038/s41467-017-00058-w
language
English
LU publication?
yes
id
9ddc617f-f259-45e4-8bb9-6791de2af4f4
date added to LUP
2017-07-18 10:28:33
date last changed
2017-07-19 03:00:01
@article{9ddc617f-f259-45e4-8bb9-6791de2af4f4,
  abstract     = {<p>Solution-processed organometal halide perovskites are hybrid crystalline semiconductors highly interesting for low-cost and efficient optoelectronics. Their properties are dependent on the crystal structure. Literature shows a variety of crystal phase transition temperatures and often a spread of the transition over tens of degrees Kelvin. We explain this inconsistency by demonstrating that the temperature of the tetragonal-to-orthorhombic phase transition in methylammonium lead triiodide depends on the concentration and nature of local defects. Phase transition in individual nanowires was studied by photoluminescence microspectroscopy and super-resolution imaging. We propose that upon cooling from 160 to 140 K, domains of the crystal containing fewer defects stay in the tetragonal phase longer than highly defected domains that readily transform to the high bandgap orthorhombic phase at higher temperatures. The existence of relatively pure tetragonal domains during the phase transition leads to drastic photoluminescence enhancement, which is inhomogeneously distributed across perovskite microcrystals.</p>},
  articleno    = {34},
  author       = {Dobrovolsky, Alexander and Merdasa, Aboma and Unger, Eva L. and Yartsev, Arkady and Scheblykin, Ivan G.},
  issn         = {2041-1723},
  language     = {eng},
  month        = {12},
  number       = {1},
  publisher    = {Nature Publishing Group},
  series       = {Nature Communications},
  title        = {Defect-induced local variation of crystal phase transition temperature in metal-halide perovskites},
  url          = {http://dx.doi.org/10.1038/s41467-017-00058-w},
  volume       = {8},
  year         = {2017},
}