Abstract
Upscalable fabrication of efficient and stable perovskite solar modules is urgently needed for commercialization. Here we introduce methylammonium chloride additives in the co-solvent system of N-methyl-2-pyrrolidone/N,N-dimethylformamide to control the formation of intermediate phases during the growth of formamidinium–caesium lead triiodide perovskite films. We achieve high-quality films upon drying without the use of anti-solvent. By implementing bulk and surface passivation, champion efficiencies of 24.02% for a small-sized solar cell and 20.5% for a 5 cm × 5 cm solar mini-module on an aperture area of 22.4 cm2 (geometric fill factor ∼ 96%) are achieved by spin-coating. The fully blade-coated perovskite solar sub-module demonstrates a champion efficiency of 15.3% on an aperture area of 205 cm2. The solar mini-module exhibits impressive operational stability with a T80 lifetime of over 1,000 h at maximum power point tracking under continuous light illumination.
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Acknowledgements
This work was supported by funding from the Energy Materials and Surface Sciences Unit of the Okinawa Institute of Science and Technology Graduate University, the OIST R&D Cluster Research Program, the OIST Proof of Concept (POC) Program and JST A-STEP grant number JPMJTM20HS, Japan. We thank the OIST Micro/Nanofabrication Section and Imaging Section for the support.
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Contributions
Y.B.Q. supervised the project. Y.B.Q. and T.B. conceived the ideas. T.B. designed the experiments and conducted the corresponding device and module fabrication and characterization. L.K.O. contributed to part of the characterization and analyses. J.L. helped with the X-ray diffraction and time-resolved photoluminescence mapping characterization. J.S. conducted the density functional theory calculations. G.T. helped with the stability test. Y.B.Q. contributed to part of the atomic force microscopy measurements. J.Z. contributed to part of the perovskite solar cell measurements. Y.L., S.K., W.Z., J.C., F.H. and Y.-B.C. provided valuable suggestions for the manuscript. Y.B.Q. and T.B. participated in all of the data analyses. Y.B.Q. and T.B. wrote the paper, and all authors revised the paper.
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Supplementary Figs. 1–26, Tables 1–4, and notes 1 and 2.
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Bu, T., Ono, L.K., Li, J. et al. Modulating crystal growth of formamidinium–caesium perovskites for over 200 cm2 photovoltaic sub-modules. Nat Energy 7, 528–536 (2022). https://doi.org/10.1038/s41560-022-01039-0
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DOI: https://doi.org/10.1038/s41560-022-01039-0
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