Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/154248
Title: Controlling the film structure by regulating 2D Ruddlesden–Popper perovskite formation enthalpy for efficient and stable tri-cation perovskite solar cells
Authors: Liang, Chao
Salim, K. M. Muhammed
Li, Pengwei
Wang, Zhuo
Koh, Teck Ming
Gu, Hao
Wu, Bo
Xia, Junmin
Zhang, Zhipeng
Wang, Kaiyang
Liu, Tanghao
Wei, Qi
Wang, Sisi
Tang, Yuxin
Shao, Guosheng
Song, Yanlin
Mathews, Nripan
Xing, Guichuan
Keywords: Science::General
Issue Date: 2020
Source: Liang, C., Salim, K. M. M., Li, P., Wang, Z., Koh, T. M., Gu, H., Wu, B., Xia, J., Zhang, Z., Wang, K., Liu, T., Wei, Q., Wang, S., Tang, Y., Shao, G., Song, Y., Mathews, N. & Xing, G. (2020). Controlling the film structure by regulating 2D Ruddlesden–Popper perovskite formation enthalpy for efficient and stable tri-cation perovskite solar cells. Journal of Materials Chemistry A, 8(12), 5874-5881. https://dx.doi.org/10.1039/D0TA00525H
Journal: Journal of Materials Chemistry A
Abstract: The incorporation of bulky organic cations into metal-halide perovskites, forming 2D–3D heterojunctions, has dramatically improved the stability of perovskite solar cells (PSCs). Nevertheless, the power conversion efficiencies (PCEs) of these PSCs are typically sacrificed because the formed 2D structures possess larger dielectric confinement, wider bandgaps, higher exciton binding energies and lower charge-carrier mobilities than 3D perovskites. Here, we demonstrate that the environmental stability of PSCs could be significantly improved without sacrificing the efficiency by introducing hydrophobic polyfluorinated cations (CF3CF2CH2NH3+, 5F-PA+) to metal-halide perovskites. Due to the large 2D perovskite formation enthalpy with polyfluorinated cations, the addition of such cations will form a protective layer at the grain boundaries of 3D perovskite rather than forming 2D perovskites. The resultant solar cells based on 5F-PA0.05[Cs0.05(MA0.17FA0.83)0.95]0.95Pb(Br0.17I0.83)3 exhibit a substantially increased PCE of 22.86% compared with the control Cs0.05(MA0.17FA0.83)0.95Pb(Br0.17I0.83)3 devices (20.69%). More importantly, the optimized devices could retain 80% of their original PCEs after >3000 h in the ambient environment with a 65 ± 10% relative humidity, which is attributed to the hydrophobic fluorine moieties. This work provides new understanding of the enhancement of PSC stability by incorporating polyfluorinated cations.
URI: https://hdl.handle.net/10356/154248
ISSN: 2050-7488
DOI: 10.1039/D0TA00525H
Rights: © 2020 The Royal Society of Chemistry. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:ERI@N Journal Articles

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