TU Darmstadt / ULB / TUbiblio

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), Wiley-VCH Verlag, ISSN 2194-4296,
DOI: 10.1002/ente.202200197,
[Article]

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.

Item Type: Article
Erschienen: 2022
Creators: Yoon, Songhak ; Fett, Bastian ; Frebel, Alexander ; Kroisl, Sina ; Herbig, Bettina ; Widenmeyer, Marc ; Balke, Benjamin ; Sextl, Gerhard ; Mandel, Karl ; Weidenkaff, Anke
Title: 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
Language: English
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.

Journal or Publication Title: Energy Technology
Volume of the journal: 10
Issue Number: 8
Publisher: Wiley-VCH Verlag
Uncontrolled Keywords: Bandgap reduction, Cs2AgBiBr6, Pb-free photovoltaics, Raman spectroscopy, Sb substitution
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Materials and Resources
Date Deposited: 16 Aug 2022 09:09
DOI: 10.1002/ente.202200197
Additional Information:

Paper No. 2200197

PPN: 498213552
Export:
Suche nach Titel in: TUfind oder in Google
Send an inquiry Send an inquiry

Options (only for editors)
Show editorial Details Show editorial Details