Two-dimensional Ruddlesden–Popper phase (2DRP) perovskites are known to exhibit improved photostability and environmental stability compared with their three-dimensional (3D) counterparts. However, fundamental questions remain over the interaction between the bulky alkylammoniums and the 2DRP perovskite framework. Here, we unambiguously demonstrate that a sulfur–sulfur interaction is present for a new bulky alkylammonium, 2-(methylthio)ethylamine hydrochloride (MTEACl). In addition to a weaker van der Waals interaction, the interaction between sulfur atoms in two MTEA molecules enables a (MTEA)2(MA)4Pb5I16 (n = 5) perovskite framework with enhanced charge transport and stabilization. The result is 2DRP perovskite solar cells with significantly improved efficiency and stability. Cells with a power conversion efficiency as high as 18.06% (17.8% certified) are achieved, along with moisture tolerance for up to 1,512 h (under 70% humidity conditions), thermal stability for 375 h (at 85 °C) and stability under continuous light stress (85% of the initial efficiency retained over 1,000 h of operation at the maximum power point).
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This work was financially supported by the National Basic Research Program of China, Fundamental Studies of Perovskite Solar Cells (grant no. 2015CB932200), Natural Science Foundation of China (grants nos. 51602149, 61705102, 61722403 and 11674121), National Key Research and Development Program of China (grants nos. 2017YFA0403403 and 2016YFB0201204), Natural Science Foundation of Jiangsu Province, China (grants nos. BK20161011, BK20161010 and BK20150064), the Young 1000 Talents Global Recruitment Program of China, the Jiangsu Specially Appointed Professor Program, the ‘Six talent peaks’ Project in Jiangsu Province, China and the Program for JLU Science and Technology Innovative Research Team. Calculations were performed in part at the High Performance Computing Centre of Jilin University.
The authors declare no competing interests.
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Ren, H., Yu, S., Chao, L. et al. Efficient and stable Ruddlesden–Popper perovskite solar cell with tailored interlayer molecular interaction. Nat. Photonics 14, 154–163 (2020). https://doi.org/10.1038/s41566-019-0572-6
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