新加坡国立大学侯毅团队近日实现了钙钛矿-有机串联太阳能电池的高效近红外采集。2025年6月25日出版的《自然》杂志发表了这项成果。

钙钛矿和有机半导体的宽带隙可调性使钙钛矿-有机串联太阳能电池的开发具有很高的理论效率。然而，报告的钙钛矿-有机串联太阳能电池的认证效率仍然低于单结钙钛矿太阳能电池，主要是因为窄带隙有机子电池中的近红外光电流不足。

研究组设计并合成了一种不对称非富勒烯受体（NFA）P2EH-1V，其特征是单侧共轭π桥，将光学带隙降低到1.27 eV，同时保持理想的激子解离和纳米形态。瞬态吸收光谱证实了从P2EH-1V到供体PM6的有效空穴转移。基于P2EH-1V的器件的非辐射电压损失降低了0.20 eV，而不损害电荷产生效率。 

附：英文原文

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

Author: Jia, Zhenrong, Guo, Xiao, Yin, Xinxing, Sun, Ming, Qiao, Jiawei, Jiang, Xinyu, Wang, Xi, Wang, Yuduan, Dong, Zijing, Shi, Zhuojie, Kuan, Chun-Hsiao, Hu, Jingcong, Zhou, Qilin, Jia, Xiangkun, Chen, Jinxi, Wei, Zhouyin, Liu, Shunchang, Liang, Haoming, Li, Nengxu, Lee, Ling Kai, Guo, Renjun, Roth, Stephan V., Mller-Buschbaum, Peter, Hao, Xiaotao, Du, Xiaoyan, Hou, Yi

Issue&Volume: 2025-06-25

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 subcells1,2,3. 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 1.27eV 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 0.20eV 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 28.60mAcm2. Furthermore, we minimize interface recombination losses, enabling the perovskite top cell to achieve an impressive open-circuit voltage (Voc) of 1.37V 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 1cm2.

DOI: 10.1038/s41586-025-09181-x

Source: https://www.nature.com/articles/s41586-025-09181-x