Fast ultraviolet detection response achieved in high-quality Cs3Bi2Br9 single crystals grown by an improved anti-solvent method

Wang, Tianyu; Xin, Shuwen; Liu, Yaoyu; Ji, Zongshuai; Liu, Guanfeng; Zhang, Shuai; Wang, Tianhua; Wang, Fengyun; Teng, Bing; Ji, Shaohua

doi:10.1039/d4tc00387j

J. Mater. Chem. C

2024

DOI: 10.1039/d4tc00387j

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Fast ultraviolet detection response achieved in high-quality Cs₃Bi₂Br₉ single crystals grown by an improved anti-solvent method

Tianyu Wang,

Shuwen Xin,

Yaoyu Liu

et al.

Abstract: Metal halide perovskites are extensively utilized in photoluminescence and photoelectric detection, owing to their modifiable band gap, elevated quantum yield, high absorption coefficient, superior charge transport properties, versatile chemical synthesis,...

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Ultralow Thermal Conductivity in Vacancy‐Ordered Halide Perovskite Cs₃Bi₂Br₉ with Strong Anharmonicity and Wave‐Like Tunneling of Low‐Energy Phonons

Chen,

Zhou,

Luo

et al. 2024

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Halide perovskites are of great interest due to their exceptional optical and optoelectronic properties. However, thermal conductivity of many halide perovskites remains unexplored. In this study, an ultralow lattice thermal conductivity κL (0.24 W m−1 K−1 at 300 K) is reported and its weak temperature dependence (≈T−0.27) in an all‐inorganic vacancy‐ordered halide perovskite, Cs3Bi2Br9. The intrinsically ultralow κL can be attributed to the soft low‐lying phonon modes with strong anharmonicity, which have been revealed by combining experimental heat capacity and Raman spectroscopy measurements, and first‐principles calculations. It is shown that the highly anharmonic phonons originate from the Bi 6s2 lone pair expression with antibonding states of Bi 6s and Br 4p orbitals driven by the dynamic BiBr6 octahedral distortion. Theoretical calculations reveal that these low‐energy phonons are mostly contributed by large Br motions induced dynamic distortion of BiBr6 octahedra and large Cs rattling motions, verified by the synchrotron X‐ray pair distribution function analysis. In addition, the weak temperature dependence of κL can be traced to the wave‐like tunneling of phonons, induced by the low‐lying phonon modes. This work reveals the strong anharmonicity and wave‐like tunneling of low‐energy phonons for designing efficient vacancy‐ordered halide perovskites with intrinsically low κL.

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Ultralow Thermal Conductivity in Vacancy‐Ordered Halide Perovskite Cs₃Bi₂Br₉ with Strong Anharmonicity and Wave‐Like Tunneling of Low‐Energy Phonons

Chen,

Zhou,

Luo

et al. 2024

Small

View full text Add to dashboard Cite

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Fast ultraviolet detection response achieved in high-quality Cs₃Bi₂Br₉ single crystals grown by an improved anti-solvent method

Abstract: Metal halide perovskites are extensively utilized in photoluminescence and photoelectric detection, owing to their modifiable band gap, elevated quantum yield, high absorption coefficient, superior charge transport properties, versatile chemical synthesis,...

Cited by 1 publication

References 31 publications

Ultralow Thermal Conductivity in Vacancy‐Ordered Halide Perovskite Cs₃Bi₂Br₉ with Strong Anharmonicity and Wave‐Like Tunneling of Low‐Energy Phonons

Ultralow Thermal Conductivity in Vacancy‐Ordered Halide Perovskite Cs₃Bi₂Br₉ with Strong Anharmonicity and Wave‐Like Tunneling of Low‐Energy Phonons

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Fast ultraviolet detection response achieved in high-quality Cs3Bi2Br9 single crystals grown by an improved anti-solvent method

Abstract: Metal halide perovskites are extensively utilized in photoluminescence and photoelectric detection, owing to their modifiable band gap, elevated quantum yield, high absorption coefficient, superior charge transport properties, versatile chemical synthesis,...

Cited by 1 publication

References 31 publications

Ultralow Thermal Conductivity in Vacancy‐Ordered Halide Perovskite Cs3Bi2Br9 with Strong Anharmonicity and Wave‐Like Tunneling of Low‐Energy Phonons

Ultralow Thermal Conductivity in Vacancy‐Ordered Halide Perovskite Cs3Bi2Br9 with Strong Anharmonicity and Wave‐Like Tunneling of Low‐Energy Phonons

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Fast ultraviolet detection response achieved in high-quality Cs₃Bi₂Br₉ single crystals grown by an improved anti-solvent method

Ultralow Thermal Conductivity in Vacancy‐Ordered Halide Perovskite Cs₃Bi₂Br₉ with Strong Anharmonicity and Wave‐Like Tunneling of Low‐Energy Phonons

Ultralow Thermal Conductivity in Vacancy‐Ordered Halide Perovskite Cs₃Bi₂Br₉ with Strong Anharmonicity and Wave‐Like Tunneling of Low‐Energy Phonons