Sb?Substituted Cs <sub>2</sub> AgBiBr <sub>6</sub> —As Much As It Could Be?—Influence of Synthesis Methods on Sb?Substitution Level in Cs <sub>2</sub> AgBiBr <sub>6</sub>

نویسندگان

چکیده

Sb-substituted Cs2AgBiBr6 single crystals and powders are synthesized by various wet-chemical routes as well solvent-free mechanochemical synthesis. Phase purity resulting optical properties of differently absorbers investigated compared. X-ray diffraction confirms that Sb substitution results in an apparent single-phase formation with a unit cell shrinkage up to certain limit, which varies depending on the synthesis routes. Questions about phase identification determined raised thoroughly Raman spectroscopy. UV–vis spectroscopy reveals Sb3+ induces reduction bandgap Cs2AgBiBr6, whereas octahedral factor calculations provide SbBr6 octahedra can be hardly stable double perovskite. The experimental occurrence evolution bands theoretical structural stability unambiguously raise doubts Sb-substitution feasibility general strategy is discussed.

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ژورنال

عنوان ژورنال: Energy technology

سال: 2022

ISSN: ['2194-4288', '2194-4296']

DOI: https://doi.org/10.1002/ente.202200197