Efficient near-infrared harvesting in perovskite–organic tandem solar cells

Zhenrong Jia, Xiao Guo, Xinxing Yin, Ming Sun, Jiawei Qiao, Xinyu Jiang, Xi Wang, Yuduan Wang, Zijing Dong, Zhuojie Shi, Chun-Hsiao Kuan, Jingcong Hu, Qilin Zhou, Xiangkun Jia, Jinxi Chen, Zhouyin Wei, Shunchang Liu, Haoming Liang, Nengxu Li, Ling Kai Lee, Renjun Guo, Stephan V. Roth, Peter Müller-Buschbaum, Xiaotao Hao, Xiaoyan Du and Yi Hou ()
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Zhenrong Jia: National University of Singapore
Xiao Guo: National University of Singapore
Xinxing Yin: Jiaxing University
Ming Sun: Shandong University
Jiawei Qiao: Shandong University
Xinyu Jiang: Deutsches Elektronen-Synchrotron (DESY)
Xi Wang: National University of Singapore
Yuduan Wang: National University of Singapore
Zijing Dong: National University of Singapore
Zhuojie Shi: National University of Singapore
Chun-Hsiao Kuan: National Yang Ming Chiao Tung University
Jingcong Hu: National University of Singapore
Qilin Zhou: National University of Singapore
Xiangkun Jia: National University of Singapore
Jinxi Chen: National University of Singapore
Zhouyin Wei: National University of Singapore
Shunchang Liu: National University of Singapore
Haoming Liang: National University of Singapore
Nengxu Li: National University of Singapore
Ling Kai Lee: National University of Singapore
Renjun Guo: National University of Singapore
Stephan V. Roth: Deutsches Elektronen-Synchrotron (DESY)
Peter Müller-Buschbaum: Technical University of Munich
Xiaotao Hao: Shandong University
Xiaoyan Du: Shandong University
Yi Hou: National University of Singapore

Nature, 2025, vol. 643, issue 8070, 104-110

Abstract: Abstract The broad bandgap tunability of both perovskites and organic semiconductors enables the development of perovskite–organic tandem solar cells with promising theoretical efficiency. However, the certified efficiencies of reported perovskite–organic tandem solar cells remain lower than those of single-junction perovskite solar cells, primarily because of insufficient near-infrared photocurrent in narrow-bandgap organic subcells1–3. Here we design and synthesize an asymmetric non-fullerene acceptor (NFA), P2EH-1V, featuring a unilateral conjugated π-bridge to reduce the optical bandgap to 1.27 eV while maintaining ideal exciton dissociation and nanomorphology. Transient absorption spectroscopy confirms efficient hole transfer from P2EH-1V to the donor PM6. Devices based on P2EH-1V exhibit reduced non-radiative voltage losses of 0.20 eV without compromising charge-generation efficiency. We achieve a 17.9% efficiency for the organic bottom cell, with a high short-circuit current density (Jsc) of 28.60 mA cm−2. Furthermore, we minimize interface recombination losses, enabling the perovskite top cell to achieve an impressive open-circuit voltage (Voc) of 1.37 V and a fill factor (FF) of 85.5%. These advancements result in perovskite–organic tandem solar cells achieving a record efficiency of 26.7% (certified at 26.4%) over an aperture area greater than 1 cm2.

Date: 2025
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DOI: 10.1038/s41586-025-09181-x

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