Enhanced visible light absorption for lead-free double perovskite Cs2AgSbBr6.
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Peer-reviewed
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Article
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Authors
Wei, Fengxia
Deng, Zeyu https://orcid.org/0000-0003-0109-9367
Sun, Shijing
Hartono, Noor Titan Putri
Seng, Hwee Leng
Abstract
In a search for Pb-free photovoltaic materials, a double perovskite Cs2AgSbBr6 with an indirect optical bandgap of 1.64 eV has been synthesized. Single crystal X-ray diffraction determined the space group as Fm3[combining macron]m 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 Sb5+ in the black crystals, suggesting that the dark colour arises from the Sb3+-Sb5+ charge transfer. Furthermore, UV visible spectroscopy and density functional theory calculations have been applied to probe the optical properties and electronic structure.
Description
Keywords
0306 Physical Chemistry (incl. Structural)
Journal Title
Chem Commun (Camb)
Conference Name
Journal ISSN
1359-7345
1364-548X
1364-548X
Volume Title
55
Publisher
Royal Society of Chemistry (RSC)