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• W4280610971 abstract "Chalcogenides in perovskite and the related layered Ruddlesden-Popper crystal structures (chalcogenide perovskites for brevity) are an exciting family of semiconductors but remain experimentally little studied. Chalcogenide perovskites share crystal structures and some physical properties with ionic compounds such as oxide and halide perovskites, but the metal-chalcogen bonds responsible for semiconducting behavior are substantially more covalent than in these more-studied perovskites. Here, we use complementary experimental and theoretical methods to study how the mixed ionic-covalent Zr-S bonds support the electronic structure and physical properties of perovskite ${mathrm{BaZrS}}_{3}$ and Ruddlesden-Popper ${mathrm{Ba}}_{3}{mathrm{Zr}}_{2}{mathrm{S}}_{7}$. We apply theoretical methods to assign features of experimentally measured x-ray absorption spectroscopy (XAS) to particular orbital transitions, enabling a clear physical interpretation of angle-dependent, polarized XAS data measured on single-crystal samples, and an atomistic view of the covalent bonding network that facilitates charge transport. Polarized Raman measurements identify signatures of crystalline anisotropy in ${mathrm{Ba}}_{3}{mathrm{Zr}}_{2}{mathrm{S}}_{7}$ and enable the first assignments of mode symmetry in this material. Infrared reflectivity reveals electronic transport properties that augur well for the use of chalcogenide perovskites in optoelectronic and energy-conversion technologies." @default.
• W4280610971 created "2022-05-22" @default.
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• W4280610971 date "2022-05-11" @default.
• W4280610971 modified "2023-10-18" @default.
• W4280610971 title "Low-energy electronic structure of perovskite and Ruddlesden-Popper semiconductors in the Ba-Zr-S system probed by bond-selective polarized x-ray absorption spectroscopy, infrared reflectivity, and Raman scattering" @default.
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• W4280610971 doi "https://doi.org/10.1103/physrevb.105.195203" @default.
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