Lattice dynamics and self-trapped excitons in the Cs2SnBr6double perovskites

Lattice dynamics and self-trapped excitons in the Cs2SnBr6double perovskites

Our study delved into the detailed investigation of Cs2SnBr6double perovskites, focusing on their electrical properties, lattice dynamics, and stability. The direct bandgap for Cs2SnBr6was estimated to be at 2.93 eV. One external translational mode of the Cs+lattice withT2gsymmetry and three interna...

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Veröffentlicht in:Journal of physics. Condensed matter 2024-04, Vol.36 (28)
Hauptverfasser: Hoang, Manh Ha, Le, Duy Manh, Le, Anh Thi, Nguyen, Quoc Khanh, Do, T Anh Thu, Ho, Truong Giang, Man, Minh Tan
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container_issue 28
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container_title Journal of physics. Condensed matter
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creator Hoang, Manh Ha
Le, Duy Manh
Le, Anh Thi
Nguyen, Quoc Khanh
Do, T Anh Thu
Ho, Truong Giang
Man, Minh Tan
description Our study delved into the detailed investigation of Cs2SnBr6double perovskites, focusing on their electrical properties, lattice dynamics, and stability. The direct bandgap for Cs2SnBr6was estimated to be at 2.93 eV. One external translational mode of the Cs+lattice withT2gsymmetry and three internal modes of the octahedral withA1g,Eg, andT2gsymmetries are defined by calculated lattice dynamics, experimental micro-Raman scattering. We show a correlation with first-principles calculations, validating using a band-structured electronic approach to understanding the behavior of charge carriers, and electron-phonon interactions in Cs2SnBr6. We propose that electron-vibration interactions result in self-trapped excitons (STEs) displaying significant Stokes shifts (0.508 eV) and broad-spectrum emission. Understanding the behavior of STEs is fundamental for their optoelectronic applications.
doi_str_mv 10.1088/1361-648X/ad3ac4
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title Lattice dynamics and self-trapped excitons in the Cs2SnBr6double perovskites
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