Abstract
Formamidinium-rich triiodide perovskites show great promise as light-absorption layers for next photovoltaic technology. However, the intricate process of phase transformation during the crystallization of this perovskite typically results in the presence of undesired hexagonal phases, leading to a degradation in solar cell efficiency and stability. Here we report the use of a hydrogen-bonded eutectic molecule (EM) as a [PbI6]4− octahedra ligand to promote the dominant formation of corner-sharing octahedra. Our results demonstrate that the increased ratio of corner-sharing octahedra to face-sharing octahedra can prompt a complete phase transformation and facilitate the formation of pure cubic structure perovskite. Perovskite solar cells based on EM-fabricated films provide a power conversion efficiency of 25.8% (certified 25.7%) and excellent stability with a T95 lifetime of ~2,000 h.
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All data are available in the main text or the Supplementary Information. Additional information can be obtained from corresponding authors upon reasonable request.
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Acknowledgements
W.C.H.C. thanks the project of the University Grant Council of the University of Hong Kong (grant number 202011159254), General Research Fund (grant numbers 17211220, 17200021 and 17200823), Collaborative Research (grant number C5037-18G) from the Research Grants Council of Hong Kong Special Administrative Region, China, and Innovation and Technology Fund (grant numbers MRP/040/21X and GHP/245/22SZ) from Innovation and Technology Commission of Hong Kong Special Administrative Region, China. Y.W. thanks the National Science Fund for Excellent Young Scholars (Overseas), Top Talent Project of West Lake Pearl Project, National Natural Science Foundation of China (grant number 52302315), National Natural Science Foundation of China (grant numbers 52302315 and 62474157) and the talent project of ZJU-Hangzhou Global Scientific and Technological Innovation Center (grant number 02170000-K02013017). B.X. thanks the National Key Research and Development Project funding from the Ministry of Science and Technology of China (grant number 2021YFB3800101), National Natural Science Foundation of China (grant number U19A2089), Guangdong-Hong Kong-Macao Joint Laboratory (grant number 2019B121205001), and Key Fundamental Research Project funding from the Shenzhen Science and Technology Innovation Committee (grant number JCYJ20220818100406014). G.Z. thanks the Shanghai Sailing Program (grant number 21YF1453500), National Natural Science Foundation of China (grant number 12104467) and Youth Innovation Promotion Association of the Chinese Academy of Sciences (grant number 2023305).
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Z.-W.G., W.C.H.C., B.X. and Y.W. conceived the idea. W.C.H.C. coordinated the work. Y.W., B.X. and W.C.H.C. supported this work. Z.-W.G. fabricated and characterized the devices. J.Z. and J.S. carried out the TAS and PL experiments. G.Z., Y.T. and X.L. contributed to the GIWAXS test and analysis. Z.-W.G., H.S., D.W., J.F. and L.Q. contributed to data analysis. Z.-W.G. wrote the original draft and W.C.H.C., H.S., B.X. and Y.W. reviewed and edited the draft.
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Nature Photonics thanks Gianluca Bravetti and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.
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Gao, ZW., Wang, D., Fang, J. et al. Eutectic molecule ligand stabilizes photoactive black phase perovskite. Nat. Photon. 19, 258–263 (2025). https://doi.org/10.1038/s41566-024-01596-8
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DOI: https://doi.org/10.1038/s41566-024-01596-8
