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Enhanced visible light absorption for lead-free double perovskite Cs2AgSbBr6.

Accepted version
Peer-reviewed

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Article

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Authors

Wei, Fengxia 
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

Volume Title

55

Publisher

Royal Society of Chemistry (RSC)