All-perovskite tandem solar cells provide high power conversion efficiency at a low cost1,2,3,4. Rapid efficiency improvement in small-area (<0.1 cm2) tandem solar cells has been primarily driven by advances in low-bandgap (approximately 1.25 eV) perovskite bottom subcells5,6,7. However, unsolved issues remain for wide-bandgap (> 1.75 eV) perovskite top subcells8, which at present have large voltage and fill factor losses, particularly for large-area (>1 cm2) tandem solar cells. Here we develop a self-assembled monolayer of (4-(7H-dibenzo[c,g]carbazol-7-yl)butyl)phosphonic acid as a hole-selective layer for wide-bandgap perovskite solar cells, which facilitates subsequent growth of high-quality wide-bandgap perovskite over a large area with suppressed interfacial non-radiative recombination, enabling efficient hole extraction. By integrating (4-(7H-dibenzo[c,g]carbazol-7-yl)butyl)phosphonic acid in devices, we demonstrate a high open-circuit voltage (VOC) of 1.31 V in a 1.77-eV perovskite solar cell, corresponding to a very low VOC deficit of 0.46 V (with respect to the bandgap). With these wide-bandgap perovskite subcells, we report 27.0% (26.4% certified stabilized) monolithic all-perovskite tandem solar cells with an aperture area of 1.044 cm2. The certified tandem cell shows an outstanding combination of a high VOC of 2.12 V and a fill factor of 82.6%. Our demonstration of the large-area tandem solar cells with high certified efficiency is a key step towards scaling up all-perovskite tandem photovoltaic technology.
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All data are available in the paper or Supplementary Information. The data that support the findings of this study are available from the corresponding authors on reasonable request.
The codes that support the findings of this study are available from the corresponding authors on reasonable request.
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This work was financially supported by the National Key Research and Development Program of China (no. 2019YFE0120000), the National Natural Science Foundation of China (nos. 62174112, 62005188 and 21875111), the Fundamental Research Funds for the Central Universities (nos. YJ201955 and YJ2021157), the Science and Technology Program of Sichuan Province (no. 2020JDJQ0030), the Engineering Featured Team Fund of Sichuan University (2020SCUNG102), the Research Funds from Tan Kah Kee Innovation Laboratory (HRTP--45), the Key R&D Program of Natural Science Foundation of Jiangsu Province (BE2019733), the Natural Science Foundation of Jiangsu Province (BK20190825), open foundation of State Key Laboratory of Featured Metal Materials and Life-Cycle Safety for Composite Structures, Guangxi University (grant no. 2022GXYSOF05) and Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province and Key Lab of Modern Optical Technologies of Education Ministry of China, Soochow University (no. KJS1909). F.F. acknowledges funding from the Swiss National Science Foundation (no. 200021_213073/1) and European Union’s Horizon Europe research and innovation programme under grant agreement no. 101075605. We acknowledge funding from the Deutsche Forschungsgemeinschaft in the SPP 2196 (HIPSTER 424709669 and SURPRISE 423749265). M.S. further acknowledges the Heisenberg programme from the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) for funding (project no. 498155101). F.L. acknowledges funding by the Volkswagen Foundation through the Freigeist Program. We also acknowledge Jihua Zou for measuring confocal PL mapping of WBG perovskites.
The authors declare no competing interests.
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He, R., Wang, W., Yi, Z. et al. Improving interface quality for 1-cm2 all-perovskite tandem solar cells. Nature (2023). https://doi.org/10.1038/s41586-023-05992-y
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