Directional Negative Thermal Expansion and Large Poisson Ratio in CH3NH3PbI3 Perovskite Revealed by Strong Coherent Shear Phonon Generation

Pierre Adrien Mante, Constantinos C. Stoumpos, Mercouri G Kanatzidis, Arkady Yartsev

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Despite the enormous amount of attention CH3NH3PbI3 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 CH3NH3PbI3 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 CH3NH3PbI3, 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.

Original languageEnglish
Pages (from-to)3161-3166
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume9
Issue number12
DOIs
Publication statusPublished - Jun 21 2018

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Poisson ratio
Phonons
Perovskite
thermal expansion
phonons
shear
Mechanical stability
Acoustic wave velocity
Ultrashort pulses
acoustic velocity
Thermal expansion
Transducers
transducers
Single crystals
Crystalline materials
Crystals
propagation
Monitoring
single crystals
pulses

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Directional Negative Thermal Expansion and Large Poisson Ratio in CH3NH3PbI3 Perovskite Revealed by Strong Coherent Shear Phonon Generation. / Mante, Pierre Adrien; Stoumpos, Constantinos C.; Kanatzidis, Mercouri G; Yartsev, Arkady.

In: Journal of Physical Chemistry Letters, Vol. 9, No. 12, 21.06.2018, p. 3161-3166.

Research output: Contribution to journalArticle

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