Abstract
Wide-bandgap mixed-halide perovskite solar cells (WBG-PSCs) are promising top cells for efficient tandem photovoltaics to achieve high power conversion efficiency (PCE) at low cost. However, the open-circuit voltage (VOC) of WBG-PSCs is still unsatisfactory as the VOC-deficit is generally larger than 0.45 V. Herein, we report a buried interface engineering strategy that substantially improves the VOC of WBG-PSCs by inserting amphophilic molecular hole-selective materials featuring with a cyanovinyl phosphonic acid (CPA) anchoring group between the perovskite and substrate. The assembly and redistribution of CPA-based amphiphilic molecules at the perovskite-substrate buried interface not only promotes the growth of a low-defect crystalline perovskite thin film, but also suppresses the photo-induced halide phase separation. The energy level alignment between wide-bandgap perovskite and the hole-selective layer is further improved by modulating the substituents on the triphenylamine donor moiety (methoxyls for MPA-CPA, methyls for MePA-CPA, and bare TPA-CPA). Using a 1.68 eV bandgap perovskite, the MePA-CPA-based devices achieved an unprecedentedly high VOC of 1.29 V and PCE of 22.3% under standard AM 1.5 sunlight. The VOC-deficit (<0.40 V) is the lowest value reported for WBG-PSCs. This work not only provides an effective approach to decreasing the VOC-deficit of WBG-PSCs, but also confirms the importance of energy level alignment at the charge-selective layers in PSCs.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (22179037), Shanghai pilot program for Basic Research (22TQ1400100-1), Shanghai Municipal Science and Technology Major Project (2018SHZDZX03, 21JC1401700), the Programmer of Introducing Talents of Discipline to Universities (B16017), and the Fundamental Research Funds for the Central Universities. Yue Hu acknowledges support from Royal Society of Chemistry (R23-0749928359). We thank the Research Center of Analysis and Test of East China University of Science and Technology (ECUST); Prof. Yan Li and Mr. Zhuohan Lin from ECUST for EL measurement, Mrs. Meng**g Li from Shiyanjia Lab (www.shiyanjia.com) for the UPS measurement.
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Efficient wide-bandgap perovskite solar cells with open-circuit voltage deficit below 0.4 V via hole-selective interface engineering
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Ji, X., Zhang, S., Yu, F. et al. Efficient wide-bandgap perovskite solar cells with open-circuit voltage deficit below 0.4 V via hole-selective interface engineering. Sci. China Chem. 67, 2102–2110 (2024). https://doi.org/10.1007/s11426-023-1966-1
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DOI: https://doi.org/10.1007/s11426-023-1966-1