Effect of alloying on the dynamics of coherent acoustic phonons in bismuth double perovskite single crystals

XIHONG LIN; BO WU; WEIHUA NING; MINJUN FENG; QIANG XU; FENG GAO; TZE CHIEN SUM; GUOFU ZHOU

doi:10.1364/OE.414857

Effect of alloying on the dynamics of coherent acoustic phonons in bismuth double perovskite single crystals

XIHONG LIN, BO WU, WEIHUA NING, MINJUN FENG, QIANG XU, FENG GAO, TZE CHIEN SUM, GUOFU ZHOU

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

The bismuth double perovskite Cs2AgBiBr6 has been regarded as a potential candidate for lead-free perovskite photovoltaics. A detailed study on the coherent acoustic phonon dynamics in the pure, Sb- and Tl-alloyed Cs2AgBiBr6 single crystals is performed to understand the effects of alloying on the phonon dynamics and band edge characteristics. The coherent acoustic phonon frequencies are found to be independent of the alloying, while the damping rates are highly dependent on the alloying. Based on the mechanism of coherent acoustic phonon damping, a technique has been successfully developed that can accurately extract the absorption spectra near the indirect band gap for these single crystals with coefficients on the order of 102 cm-1.

Original language	English
Pages (from-to)	7948-7955
Number of pages	8
Journal	Optics Express
Volume	29
Issue number	5
DOIs	https://doi.org/10.1364/OE.414857
Publication status	Published - Mar 1 2021
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2021 Optical Society of America.

ASJC Scopus Subject Areas

Atomic and Molecular Physics, and Optics

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10.1364/OE.414857

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abstract = "The bismuth double perovskite Cs2AgBiBr6 has been regarded as a potential candidate for lead-free perovskite photovoltaics. A detailed study on the coherent acoustic phonon dynamics in the pure, Sb- and Tl-alloyed Cs2AgBiBr6 single crystals is performed to understand the effects of alloying on the phonon dynamics and band edge characteristics. The coherent acoustic phonon frequencies are found to be independent of the alloying, while the damping rates are highly dependent on the alloying. Based on the mechanism of coherent acoustic phonon damping, a technique has been successfully developed that can accurately extract the absorption spectra near the indirect band gap for these single crystals with coefficients on the order of 102 cm-1.",

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AU - LIN, XIHONG

AU - WU, BO

AU - NING, WEIHUA

AU - FENG, MINJUN

AU - XU, QIANG

AU - GAO, FENG

AU - SUM, TZE CHIEN

AU - ZHOU, GUOFU

PY - 2021/3/1

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AB - The bismuth double perovskite Cs2AgBiBr6 has been regarded as a potential candidate for lead-free perovskite photovoltaics. A detailed study on the coherent acoustic phonon dynamics in the pure, Sb- and Tl-alloyed Cs2AgBiBr6 single crystals is performed to understand the effects of alloying on the phonon dynamics and band edge characteristics. The coherent acoustic phonon frequencies are found to be independent of the alloying, while the damping rates are highly dependent on the alloying. Based on the mechanism of coherent acoustic phonon damping, a technique has been successfully developed that can accurately extract the absorption spectra near the indirect band gap for these single crystals with coefficients on the order of 102 cm-1.

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Effect of alloying on the dynamics of coherent acoustic phonons in bismuth double perovskite single crystals

Abstract

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