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Issue 33, 2019
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Solvation effect in precursor solution enables over 16% efficiency in thick 2D perovskite solar cells

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Abstract

High-quality thick light harvesting film is important for two-dimensional (2D) perovskite solar cells (PVSCs). The relationship between the structure of the second spacer cation (SSC+) in the precursor solution and the morphology of the perovskite film was studied. By applying structurally symmetric guanidinium (GA+) as a SSC+ and utilizing the solvation effect of GA+ in N,N-dimethylformamide (DMF), the solvent of the precursor, we realized the fabrication of 2D BA2MA4Pb5I16 (BA+ = butylammonium, MA+ = methylammonium) perovskite film with oriented crystal grains grown throughout the 530 nm thick film on a PEDOT:PSS substrate, which favored the fast transport of the charge carriers. The inverted planar-structured PVSCs exhibit a hero PCE of 14.94%. The device efficiency was further improved to 16.26%, one of the highest efficiencies reported for 2D PVSCs, through interface optimization via adding MACl into the precursor solution. The unsealed device exhibits moisture stability by retaining 90% of its initial PCE after 800 hours of exposure to air with a humidity of 55 ± 5%. This work provides a new approach toward high-performance 2D PVSCs in terms of both PCE and stability.

Graphical abstract: Solvation effect in precursor solution enables over 16% efficiency in thick 2D perovskite solar cells

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Publication details

The article was received on 05 Jun 2019, accepted on 29 Jul 2019 and first published on 31 Jul 2019


Article type: Paper
DOI: 10.1039/C9TA06009J
J. Mater. Chem. A, 2019,7, 19423-19429

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    Solvation effect in precursor solution enables over 16% efficiency in thick 2D perovskite solar cells

    X. Lian, J. Chen, Y. Zhang, M. Qin, T. R. Andersen, J. Ling, G. Wu, X. Lu, D. Yang and H. Chen, J. Mater. Chem. A, 2019, 7, 19423
    DOI: 10.1039/C9TA06009J

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