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

Yoon, Songhak ; Fett, Bastian ; Frebel, Alexander ; Kroisl, Sina ; Herbig, Bettina ; Widenmeyer, Marc ; Balke, Benjamin ; Sextl, Gerhard ; Mandel, Karl ; Weidenkaff, Anke (2022)
Sb‐Substituted Cs 2 AgBiBr 6 —As Much As It Could Be?—Influence of Synthesis Methods on Sb‐Substitution Level in Cs 2 AgBiBr 6.
In: Energy Technology, 10 (8)
doi: 10.1002/ente.202200197
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

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

Typ des Eintrags: Artikel
Erschienen: 2022
Autor(en): Yoon, Songhak ; Fett, Bastian ; Frebel, Alexander ; Kroisl, Sina ; Herbig, Bettina ; Widenmeyer, Marc ; Balke, Benjamin ; Sextl, Gerhard ; Mandel, Karl ; Weidenkaff, Anke
Art des Eintrags: Bibliographie
Titel: Sb‐Substituted Cs 2 AgBiBr 6 —As Much As It Could Be?—Influence of Synthesis Methods on Sb‐Substitution Level in Cs 2 AgBiBr 6
Sprache: Englisch
Publikationsjahr: August 2022
Verlag: Wiley-VCH Verlag
Titel der Zeitschrift, Zeitung oder Schriftenreihe: Energy Technology
Jahrgang/Volume einer Zeitschrift: 10
(Heft-)Nummer: 8
DOI: 10.1002/ente.202200197
Kurzbeschreibung (Abstract):

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

Freie Schlagworte: Bandgap reduction, Cs2AgBiBr6, Pb-free photovoltaics, Raman spectroscopy, Sb substitution
Zusätzliche Informationen:

Paper No. 2200197

Fachbereich(e)/-gebiet(e): 11 Fachbereich Material- und Geowissenschaften
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Werkstofftechnik und Ressourcenmanagement
Hinterlegungsdatum: 16 Aug 2022 09:09
Letzte Änderung: 06 Okt 2022 08:20
PPN: 498213552
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