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Enhanced visible light absorption for lead-free double perovskite Cs2AgSbBr6.
- Source :
- Chemical Communications; 4/4/2019, Vol. 55 Issue 26, p3721-3724, 4p
- Publication Year :
- 2019
-
Abstract
- In a search for Pb-free photovoltaic materials, a double perovskite Cs<subscript>2</subscript>AgSbBr<subscript>6</subscript> with an indirect optical bandgap of 1.64 eV has been synthesized. Single crystal X-ray diffraction determined the space group as Fm3̅m with a = 11.1583(7) Å. The black, as-synthesised compound turned brown after heat treatment at 480 K while the symmetry and crystallinity were preserved. X-ray photoelectron spectroscopy indicated the existence of Sb<superscript>5+</superscript> in the black crystals, suggesting that the dark colour arises from the Sb<superscript>3+</superscript>–Sb<superscript>5+</superscript> charge transfer. Furthermore, UV visible spectroscopy and density functional theory calculations have been applied to probe the optical properties and electronic structure. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13597345
- Volume :
- 55
- Issue :
- 26
- Database :
- Complementary Index
- Journal :
- Chemical Communications
- Publication Type :
- Academic Journal
- Accession number :
- 135587143
- Full Text :
- https://doi.org/10.1039/c9cc01134j