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Issue 26, 2019
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Enhanced visible light absorption for lead-free double perovskite Cs2AgSbBr6

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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 Fm[3 with 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.

Graphical abstract: Enhanced visible light absorption for lead-free double perovskite Cs2AgSbBr6

  • This article is part of the themed collection: Perovskites
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Publication details

The article was received on 08 Feb 2019, accepted on 05 Mar 2019 and first published on 06 Mar 2019


Article type: Communication
DOI: 10.1039/C9CC01134J
Chem. Commun., 2019,55, 3721-3724

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    Enhanced visible light absorption for lead-free double perovskite Cs2AgSbBr6

    F. Wei, Z. Deng, S. Sun, N. T. P. Hartono, H. L. Seng, T. Buonassisi, P. D. Bristowe and A. K. Cheetham, Chem. Commun., 2019, 55, 3721
    DOI: 10.1039/C9CC01134J

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