Using Ligand Engineering to Produce Efficient and Stable Pb–Sn Perovskite Solar Cells with Antioxidative 2D Capping Layers

Wang, Ge; Wang, Chen; MacKenzie, Roderick C.I.; Zhu, Zihan; Chen, Yi; Ruan, Shengping; Wen, Shanpeng

doi:10.1021/acsami.1c24763

Using Ligand Engineering to Produce Efficient and Stable Pb–Sn Perovskite Solar Cells with Antioxidative 2D Capping Layers

Wang, Ge; Wang, Chen; MacKenzie, Roderick C.I.; Zhu, Zihan; Chen, Yi; Ruan, Shengping; Wen, Shanpeng

Authors

Ge Wang

Chen Wang

Dr Roderick MacKenzie roderick.mackenzie@durham.ac.uk
Assistant Professor

Zihan Zhu

Yi Chen

Shengping Ruan

Shanpeng Wen

Abstract

Pb–Sn binary halide perovskites are a promising photovoltaic material due to their low toxicity and optical absorption spectrum well matched to the solar spectrum. However, the ready oxidation of Sn2+ to Sn4+ makes the material system currently too unstable to commercialize. Herein, ligand engineering based on antioxidative tyramine (hydrochloride, TACl) is presented for the first time to increase the stability of this material system. Using this strategy, we generate a two-dimensional (2D) capping layer on top of a standard three-dimensional Pb–Sn film. After capping, the surface defects can be passivated and the TACl-based 2D perovskite effectively protected Sn2+ from oxidation, which stabilized the Sn–Pb perovskite composition, avoiding the Pb-based perovskite formation. It is further found that the TACl treatment suppressed the halide segregation and improved the perovskite film photostability. Cell efficiency increases from 16.25 to 18.28% and device lifetime (T80) increases from less than 100 to over 1000 h. Our finding suggests that tuning ligand form/function represents a potentially highly productive direction to explore when trying to produce stable tin-based perovskite devices.

Citation

Wang, G., Wang, C., MacKenzie, R. C., Zhu, Z., Chen, Y., Ruan, S., & Wen, S. (2022). Using Ligand Engineering to Produce Efficient and Stable Pb–Sn Perovskite Solar Cells with Antioxidative 2D Capping Layers. ACS Applied Materials and Interfaces, 14(12), 14729-14738. https://doi.org/10.1021/acsami.1c24763

Journal Article Type	Article
Acceptance Date	Mar 15, 2022
Online Publication Date	Mar 21, 2022
Publication Date	Mar 30, 2022
Deposit Date	Apr 19, 2022
Publicly Available Date	Mar 21, 2023
Journal	ACS Applied Materials & Interfaces
Print ISSN	1944-8244
Electronic ISSN	1944-8252
Publisher	American Chemical Society
Peer Reviewed	Peer Reviewed
Volume	14
Issue	12
Pages	14729-14738
DOI	https://doi.org/10.1021/acsami.1c24763

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Copyright Statement
This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials and Interfaces, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsami.1c24763.