CsPb₂ Br₅ is a ternary halogen-plumbate material with close characteristics to the well-reported halide perovskites. Owing to its unconventional two-dimensional structure, CsPb₂ Br₅ is being looked at broadly for potential applications in optoelectronics. CsPb₂ Br₅ investigations are currently limited to nanostructures and powder forms of the material, which present unclear and conflicting optical properties. In this study, we present the synthesis and characterization of CsPb₂ Br₅ bulk single crystals, which enabled us to finally clarify the material's optical features. Our CsPb₂ Br₅ crystal has a two-dimensional structure with Pb₂ Br₅⁻ layers spaced by Cs⁺ cations, and exhibits approximately 3.1 eV indirect band gap with no emission in the visible spectrum.
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Dursun et al. (2017) studied this question.
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