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Large lattice distortions and size-dependent bandgap modulation in epitaxial halide perovskite nanowires

Oksenberg, Eitan ; Merdasa, Aboma LU ; Houben, Lothar ; Kaplan-Ashiri, Ifat ; Rothman, Amnon ; Scheblykin, Ivan G. LU ; Unger, Eva L. LU and Joselevich, Ernesto (2020) In Nature Communications 11.
Abstract

Metal-halide perovskites have been shown to be remarkable and promising optoelectronic materials. However, despite ongoing research from multiple perspectives, some fundamental questions regarding their optoelectronic properties remain controversial. One reason is the high-variance of data collected from, often unstable, polycrystalline thin films. Here we use ordered arrays of stable, single-crystal cesium lead bromide (CsPbBr3) nanowires grown by surface-guided chemical vapor deposition to study fundamental properties of these semiconductors in a one-dimensional model system. Specifically, we uncover the origin of an unusually large size-dependent luminescence emission spectral blue-shift. Using multiple spatially resolved... (More)

Metal-halide perovskites have been shown to be remarkable and promising optoelectronic materials. However, despite ongoing research from multiple perspectives, some fundamental questions regarding their optoelectronic properties remain controversial. One reason is the high-variance of data collected from, often unstable, polycrystalline thin films. Here we use ordered arrays of stable, single-crystal cesium lead bromide (CsPbBr3) nanowires grown by surface-guided chemical vapor deposition to study fundamental properties of these semiconductors in a one-dimensional model system. Specifically, we uncover the origin of an unusually large size-dependent luminescence emission spectral blue-shift. Using multiple spatially resolved spectroscopy techniques, we establish that bandgap modulation causes the emission shift, and by correlation with state-of-the-art electron microscopy methods, we reveal its origin in substantial and uniform lattice rotations due to heteroepitaxial strain and lattice relaxation. Understanding strain and its effect on the optoelectronic properties of these dynamic materials, from the atomic scale up, is essential to evaluate their performance limits and fundamentals of charge carrier dynamics.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nature Communications
volume
11
article number
489
publisher
Nature Publishing Group
external identifiers
  • scopus:85078229315
  • pmid:31980620
ISSN
2041-1723
DOI
10.1038/s41467-020-14365-2
language
English
LU publication?
yes
id
32885a8f-8528-448f-b2e4-fe38e6adb41d
date added to LUP
2020-02-04 08:41:56
date last changed
2020-02-12 10:20:27
@article{32885a8f-8528-448f-b2e4-fe38e6adb41d,
  abstract     = {<p>Metal-halide perovskites have been shown to be remarkable and promising optoelectronic materials. However, despite ongoing research from multiple perspectives, some fundamental questions regarding their optoelectronic properties remain controversial. One reason is the high-variance of data collected from, often unstable, polycrystalline thin films. Here we use ordered arrays of stable, single-crystal cesium lead bromide (CsPbBr<sub>3</sub>) nanowires grown by surface-guided chemical vapor deposition to study fundamental properties of these semiconductors in a one-dimensional model system. Specifically, we uncover the origin of an unusually large size-dependent luminescence emission spectral blue-shift. Using multiple spatially resolved spectroscopy techniques, we establish that bandgap modulation causes the emission shift, and by correlation with state-of-the-art electron microscopy methods, we reveal its origin in substantial and uniform lattice rotations due to heteroepitaxial strain and lattice relaxation. Understanding strain and its effect on the optoelectronic properties of these dynamic materials, from the atomic scale up, is essential to evaluate their performance limits and fundamentals of charge carrier dynamics.</p>},
  author       = {Oksenberg, Eitan and Merdasa, Aboma and Houben, Lothar and Kaplan-Ashiri, Ifat and Rothman, Amnon and Scheblykin, Ivan G. and Unger, Eva L. and Joselevich, Ernesto},
  issn         = {2041-1723},
  language     = {eng},
  month        = {01},
  publisher    = {Nature Publishing Group},
  series       = {Nature Communications},
  title        = {Large lattice distortions and size-dependent bandgap modulation in epitaxial halide perovskite nanowires},
  url          = {http://dx.doi.org/10.1038/s41467-020-14365-2},
  doi          = {10.1038/s41467-020-14365-2},
  volume       = {11},
  year         = {2020},
}