Publication detail

Speed of sound and elastic properties of single crystals of inorganic and hybrid lead-free iodide perovskites obtained by femtosecond transient optical reflectivity

AMMIRATI, G. O'KEEFFE, P. TURCHINI, S. CATONE, D. PALADINI, A. TOSCHI, F. GAVRANOVIĆ, S. POSPÍŠIL, J. MANNINO, G. VALASTRO, S. MARTELLI, F.

Original Title

Speed of sound and elastic properties of single crystals of inorganic and hybrid lead-free iodide perovskites obtained by femtosecond transient optical reflectivity

Type

journal article in Web of Science

Language

English

Original Abstract

Optoelectronic devices operate under continuous thermal stress that may influence both long-term stability and optical properties of the active material. It is therefore useful to know the elastic properties of the active materials. In general, the elastic constants of a material may be deduced by the measurement of the speed of sound in that material. In this work, we report on the measurements of the speed of sound in three lead-free halide perovskites, namely, the inorganic Cs3Bi2I9 and the hybrid MA3Bi2I9 and MA3Sb2I9, by means of femtosecond transient optical reflectivity that shows oscillations of the signal intensity that are related to the strain field caused by the photoexcitation of electron-hole pairs. The values of the speed of sound thus obtained have allowed us to extract the elastic constant, c11, along the propagation direction of the light. The c11 values indicate a lower stiffness of the hybrid materials, an important aspect when designing optoelectronic devices.

Keywords

GENERATION;PHONONS

Authors

AMMIRATI, G.; O'KEEFFE, P.; TURCHINI, S.; CATONE, D.; PALADINI, A.; TOSCHI, F.; GAVRANOVIĆ, S.; POSPÍŠIL, J.; MANNINO, G.; VALASTRO, S.; MARTELLI, F.

Released

7. 4. 2025

Publisher

AMER PHYSICAL SOC

Location

COLLEGE PK

ISBN

2475-9953

Periodical

PHYSICAL REVIEW MATERIALS

Year of study

9

Number

4

State

United States of America

Pages from

1

Pages to

5

Pages count

5

URL

https://doi.org/10.1103/PhysRevMaterials.9.043601

BibTex

@article{BUT198033,
  author="Giuseppe {Ammirati} and Patrick Kevin {O'Keeffe} and Stefano {Turchini} and Daniele {Catone} and Alessandra {Paladini} and Francesco {Toschi} and Stevan {Gavranović} and Jan {Pospíšil} and Giovanni {Mannino} and Salvatore {Valastro} and Faustino {Martelli}",
  title="Speed of sound and elastic properties of single crystals of inorganic and hybrid lead-free iodide perovskites obtained by femtosecond transient optical reflectivity",
  journal="PHYSICAL REVIEW MATERIALS",
  year="2025",
  volume="9",
  number="4",
  pages="1--5",
  doi="10.1103/PhysRevMaterials.9.043601",
  issn="2475-9953",
  url="https://doi.org/10.1103/PhysRevMaterials.9.043601"
}