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; Yi Hou

doi:10.1038/s41586-025-09181-x

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

Nature. 2025 Jun 25. doi: 10.1038/s41586-025-09181-x. Online ahead of print.

Authors

Zhenrong Jia^#^{1

2}, Xiao Guo^#^{1

2}, Xinxing Yin^#³, Ming Sun⁴, Jiawei Qiao⁴, Xinyu Jiang⁵, Xi Wang^{1

2}, Yuduan Wang^{1

2}, Zijing Dong^{1

2}, Zhuojie Shi^{1

2}, Chun-Hsiao Kuan^{6

7}, Jingcong Hu^{1

2}, Qilin Zhou^{1

2}, Xiangkun Jia^{1

2}, Jinxi Chen^{1

2}, Zhouyin Wei², Shunchang Liu^{1

2}, Haoming Liang^{1

2}, Nengxu Li^{1

2}, Ling Kai Lee², Renjun Guo², Stephan V Roth⁵, Peter Müller-Buschbaum⁸, Xiaotao Hao⁴, Xiaoyan Du⁴, Yi Hou^{9

10}

Affiliations

¹ Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore, Singapore.
² Solar Energy Research Institute of Singapore (SERIS), National University of Singapore, Singapore, Singapore.
³ China-Australia Institute for Advanced Materials and Manufacturing (IAMM), Jiaxing University, Jiaxing, China.
⁴ School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, China.
⁵ Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany.
⁶ Department of Applied Chemistry, National Yang Ming Chiao Tung University, Hsinchu, Taiwan.
⁷ Institute of Molecular Science, National Yang Ming Chiao Tung University, Hsinchu, Taiwan.
⁸ Department of Physics, TUM School of Natural Sciences, Technical University of Munich, Garching, Germany.
⁹ Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore, Singapore. yi.hou@nus.edu.sg.
¹⁰ Solar Energy Research Institute of Singapore (SERIS), National University of Singapore, Singapore, Singapore. yi.hou@nus.edu.sg.

^# Contributed equally.

PMID: 40562931
DOI: 10.1038/s41586-025-09181-x

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 subcells^1-3. 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 (J_sc) of 28.60 mA cm^-2. Furthermore, we minimize interface recombination losses, enabling the perovskite top cell to achieve an impressive open-circuit voltage (V_oc) 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.