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Lattice dynamics and self-trapped excitons in the CsSnBrdouble perovskites. | LitMetric
Our study delved into the detailed investigation of CsSnBrdouble perovskites, focusing on their electrical properties, lattice dynamics, and stability. The direct bandgap for CsSnBrwas estimated to be at 2.93 eV. One external translational mode of the Cslattice withsymmetry and three internal modes of the octahedral with,, andsymmetries 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 CsSnBr. 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.
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