Abstract
As perovskite photovoltaics stride towards commercialization, reverse bias degradation in shaded cells that must current match illuminated cells is a serious challenge. Previous research has emphasized the role of iodide and silver oxidation, and the role of hole tunnelling from the electron-transport layer into the perovskite to enable the flow of current under reverse bias in causing degradation. Here we show that device architecture engineering has a significant impact on the reverse bias behaviour of perovskite solar cells. By implementing both a ~35-nm-thick conjugated polymer hole transport layer and a more electrochemically stable back electrode, we demonstrate average breakdown voltages exceeding −15 V, comparable to those of silicon cells. Our strategy for increasing the breakdown voltage reduces the number of bypass diodes needed to protect a solar module that is partially shaded, which has been proven to be an effective strategy for silicon solar panels.
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Data availability
All data are available in the main texts and its Supplementary Information. The raw data supporting Figs. 1–3 are publicly available via figshare at https://doi.org/10.6084/m9.figshare.24069768 (ref. 83). Individual J–V parameters behind the datasets in Supplementary Figs. 3, 9c, 10b, 13, 14b, 15, 16b, 17b, 31–33, 42 and 44 and Supplementary Table 1 have also been uploaded as Supplementary Data files. Source data are provided with this paper.
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Acknowledgements
This work was primarily supported by the Office of Naval Research (award number N00014-20-1-2587): F.J., Y.S., D.P.M., J.A.S., M.G.C., H.C., S.B., S.R.M, H.J.S. and D.S.G. In addition, F.J. and D.S.G. acknowledge the institutional support from the B. Seymour Rabinovitch Endowment and the state of Washington. We acknowledge the use of facilities and instruments at the Photonics Research Center (PRC) at the Department of Chemistry, University of Washington, and at the Research Training Testbed (RTT), part of the Washington Clean Energy Testbeds system. Part of this work was carried out at the Molecular Analysis Facility (MAF), a National Nanotechnology Coordinated Infrastructure site at the University of Washington, which is supported in part by the National Science Foundation (NNCI-1542101, NNCI-2025489), the Molecular Engineering & Sciences Institute and the Clean Energy Institute. We also acknowledge S. L. Young from MAF for conducting the XPS measurements. I.E.G, D.P.M. and M.D.M acknowledge support by the US Department of Energy’s Office of Energy Efficiency and Renewable Energy (EERE) under Solar Energy Technologies Office (SETO) agreement number DE-EE0009513. T.R.R. and J.D.M. acknowledge support from the Washington Research Foundation, the University of Washington Clean Energy Institute’s Washington Clean Energy Testbeds and the Department of Energy’s SETO through the Perovskite Photovoltaic Accelerator for Commercializing Technologies programme. ToF-SIMS analysis was carried out with support provided by the National Science Foundation CBET-1626418. This work conducted in part using resources of the Shared Equipment Authority at Rice University. F.J. especially acknowledges J. Guo (University of Washington) for Labview programming, R. Giridharagopal (University of Washington), S. E. Chen (University of Washington), R. Kerner (National Renewable Energy Laboratory) and S. A. Johnson (University of Colorado, Boulder) for valuable scientific discussions.
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F.J. and D.S.G. conceived the project, designed the experiments and discussed the results together. F.J. performed the majority of the experiments and analysed the data. Y.S. performed the AFM, XRD and profilometer measurements and contributed largely to the data processing/analysis. M.Y.Y. conducted the SEM measurements. T.R.R. and J.D.M. synthesized and provided NiOx. D.P.M., S.B. and S.R.M. provided the NDI-1 electron-transporting material. D.M., I.E.G., M.D.M. and A.D.M. contributed to the electric field screening calculation and discussions. T.T., F.M. and A.D.M contributed to the ToF-SIMS measurements and discussions. J.A.S., M.G.C. and H.J.S. helped with the standardization of J–V characterizations and definition of breakdown voltage. H.C. helped with the data analysis. All authors contributed to the interpretation of the data and the presentation of this manuscript. All authors approved the submission. F.J. wrote the first manuscript. F.J., M.D.M and D.S.G. revised the manuscript with input from all the authors.
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M.D.M. is an advisor to Swift Solar. H.J.S. is a co-founder, CSO and a director of Oxford PV. The other authors declare no competing interests.
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Supplementary Figs. 1–44, Notes 1–20 and Tables 1–4.
Supplementary Data 1
Source data for Supplementary Fig. 3.
Supplementary Data 2
Source data for Supplementary Fig. 9c.
Supplementary Data 3
Source data for Supplementary Fig. 10b.
Supplementary Data 4
Source data for Supplementary Fig. 13.
Supplementary Data 5
Source data for Supplementary Fig. 14b.
Supplementary Data 6
Source data for Supplementary Fig. 15.
Supplementary Data 7
Source data for Supplementary Fig. 16b.
Supplementary Data 8
Source data for Supplementary Fig. 17b.
Supplementary Data 9
Source data for Supplementary Fig. 31.
Supplementary Data 10
Source data for Supplementary Fig. 32.
Supplementary Data 11
Source data for Supplementary Fig. 33.
Supplementary Data 12
Source data for Supplementary Fig. 42.
Supplementary Data 13
Source data for Supplementary Fig. 44.
Supplementary Data 14
Source data for Supplementary Table 1.
Source data
Source Data Fig. 1
Source data for Fig. 1b–e.
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Source data for Fig. 2b.
Source Data Fig. 3
Source data for Fig. 3b–f.
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Jiang, F., Shi, Y., Rana, T.R. et al. Improved reverse bias stability in p–i–n perovskite solar cells with optimized hole transport materials and less reactive electrodes. Nat Energy (2024). https://doi.org/10.1038/s41560-024-01600-z
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DOI: https://doi.org/10.1038/s41560-024-01600-z