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Directional Negative Thermal Expansion and Large Poisson Ratio in CH 3 NH 3 PbI 3 Perovskite Revealed by Strong Coherent Shear Phonon Generation

Mante, Pierre Adrien LU ; Stoumpos, Constantinos C. ; Kanatzidis, Mercouri G. and Yartsev, Arkady LU orcid (2018) In Journal of Physical Chemistry Letters 9(12). p.3161-3166
Abstract


Despite the enormous amount of attention CH
3
NH
3
PbI
3
has received, we are still lacking an in-depth understanding of its basic properties. In particular, the directional mechanical and structural characteristics of this material have remained elusive. Here, we investigate these properties by monitoring the propagation of longitudinal and shear phonons following the absorption of a femtosecond pulse along various crystalline directions of a CH
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Despite the enormous amount of attention CH
3
NH
3
PbI
3
has received, we are still lacking an in-depth understanding of its basic properties. In particular, the directional mechanical and structural characteristics of this material have remained elusive. Here, we investigate these properties by monitoring the propagation of longitudinal and shear phonons following the absorption of a femtosecond pulse along various crystalline directions of a CH
3
NH
3
PbI
3
single crystal. We first extract the sound velocities of longitudinal and transverse phonons along these directions of the crystal. Our study then reveals the negative directional thermal expansion of CH
3
NH
3
PbI
3
, which is responsible for strong coherent shear phonon generation. Finally, from these observations, we perform elastic characterization of this material, revealing a large directional Poisson's ratio, which reaches 0.7 and that we associate with the weak mechanical stability of this material. Our results also provide guidelines to fabricate a transducer of high-frequency transverse phonons.

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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physical Chemistry Letters
volume
9
issue
12
pages
6 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85047721021
  • pmid:29806455
ISSN
1948-7185
DOI
10.1021/acs.jpclett.8b01330
language
English
LU publication?
yes
id
10bdf613-b4c8-46fb-9e09-3f23631f8bda
date added to LUP
2019-06-03 11:30:28
date last changed
2024-06-25 17:12:16
@article{10bdf613-b4c8-46fb-9e09-3f23631f8bda,
  abstract     = {{<p><br>
                            Despite the enormous amount of attention CH<br>
                            <sub>3</sub><br>
                            NH<br>
                            <sub>3</sub><br>
                            PbI<br>
                            <sub>3</sub><br>
                             has received, we are still lacking an in-depth understanding of its basic properties. In particular, the directional mechanical and structural characteristics of this material have remained elusive. Here, we investigate these properties by monitoring the propagation of longitudinal and shear phonons following the absorption of a femtosecond pulse along various crystalline directions of a CH<br>
                            <sub>3</sub><br>
                            NH<br>
                            <sub>3</sub><br>
                            PbI<br>
                            <sub>3</sub><br>
                             single crystal. We first extract the sound velocities of longitudinal and transverse phonons along these directions of the crystal. Our study then reveals the negative directional thermal expansion of CH<br>
                            <sub>3</sub><br>
                            NH<br>
                            <sub>3</sub><br>
                            PbI<br>
                            <sub>3</sub><br>
                            , which is responsible for strong coherent shear phonon generation. Finally, from these observations, we perform elastic characterization of this material, revealing a large directional Poisson's ratio, which reaches 0.7 and that we associate with the weak mechanical stability of this material. Our results also provide guidelines to fabricate a transducer of high-frequency transverse phonons.<br>
                        </p>}},
  author       = {{Mante, Pierre Adrien and Stoumpos, Constantinos C. and Kanatzidis, Mercouri G. and Yartsev, Arkady}},
  issn         = {{1948-7185}},
  language     = {{eng}},
  month        = {{06}},
  number       = {{12}},
  pages        = {{3161--3166}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{Journal of Physical Chemistry Letters}},
  title        = {{Directional Negative Thermal Expansion and Large Poisson Ratio in CH
                        <sub>3</sub>
                        NH
                        <sub>3</sub>
                        PbI
                        <sub>3</sub>
                         Perovskite Revealed by Strong Coherent Shear Phonon Generation}},
  url          = {{http://dx.doi.org/10.1021/acs.jpclett.8b01330}},
  doi          = {{10.1021/acs.jpclett.8b01330}},
  volume       = {{9}},
  year         = {{2018}},
}