Issue 17, 2022

Bandgap tuning of a CsPbBr3 perovskite with synergistically improved quality via Sn2+ doping for high-performance carbon-based inorganic perovskite solar cells

Abstract

Narrowing the bandgap and promoting the quality of inorganic perovskites are the key points to improve the performance of inorganic perovskite solar cells. Herein, we incorporate Sn2+ into an inorganic CsPbBr3 perovskite to simultaneously tune the bandgap and improve the quality of the perovskite film. The density functional theory calculations demonstrate that the incorporation of Sn2+ leads to an obvious shift of the conduction band minimum of the CsPbBr3 perovskite towards the lower energy region. Therefore, the bandgap of CsPb1−xSnxBr3 perovskites is gradually reduced with the increase of the Sn2+ content. Additionally, when Pb2+ is substituted with an appropriate amount of Sn2+, the doped perovskite films display largely promoted quality compared to the undoped one. These advantages lead to the suppression of charge recombination and the enhancement of light harvesting in the as-fabricated perovskite solar cells (PSCs). Consequently, the CsPb0.95Sn0.05Br3-based PSC with a structure of FTO/TiO2 layer/perovskite/carbon delivers a greatly promoted power conversion efficiency of 8.04% compared with the efficiency of 5.93% for the controlled device. Moreover, the CsPb0.95Sn0.05Br3 PSC without any encapsulation preserves over 91% of its initial efficiency after 720 h of storage in ambient air, suggesting an excellent stability.

Graphical abstract: Bandgap tuning of a CsPbBr3 perovskite with synergistically improved quality via Sn2+ doping for high-performance carbon-based inorganic perovskite solar cells

Supplementary files

Article information

Article type
Research Article
Submitted
16 apr 2022
Accepted
26 jun 2022
First published
28 jun 2022

Inorg. Chem. Front., 2022,9, 4359-4368

Bandgap tuning of a CsPbBr3 perovskite with synergistically improved quality via Sn2+ doping for high-performance carbon-based inorganic perovskite solar cells

G. Wang, J. Bi, J. Chang, M. Lei, H. Zheng and Y. Yan, Inorg. Chem. Front., 2022, 9, 4359 DOI: 10.1039/D2QI00802E

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