Near-infrared absorbing acceptor with suppressed triplet exciton generation enabling high performance tandem organic solar cells

Zhenrong Jia, Qing Ma, Zeng Chen, Lei Meng (), Nakul Jain, Indunil Angunawela, Shucheng Qin, Xiaolei Kong, Xiaojun Li, Yang (Michael) Yang, Haiming Zhu, Harald Ade (), Feng Gao () and Yongfang Li ()
Additional contact information
Zhenrong Jia: Chinese Academy of Sciences
Qing Ma: Chinese Academy of Sciences
Zeng Chen: Zhejiang University
Lei Meng: Chinese Academy of Sciences
Nakul Jain: and Biology (IFM), Linköping University
Indunil Angunawela: North Carolina State University
Shucheng Qin: Chinese Academy of Sciences
Xiaolei Kong: Chinese Academy of Sciences
Xiaojun Li: Chinese Academy of Sciences
Yang (Michael) Yang: Zhejiang University
Haiming Zhu: Zhejiang University
Harald Ade: North Carolina State University
Feng Gao: and Biology (IFM), Linköping University
Yongfang Li: Chinese Academy of Sciences

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract Reducing the energy loss of sub-cells is critical for high performance tandem organic solar cells, while it is limited by the severe non-radiative voltage loss via the formation of non-emissive triplet excitons. Herein, we develop an ultra-narrow bandgap acceptor BTPSeV-4F through replacement of terminal thiophene by selenophene in the central fused ring of BTPSV-4F, for constructing efficient tandem organic solar cells. The selenophene substitution further decrease the optical bandgap of BTPSV-4F to 1.17 eV and suppress the formation of triplet exciton in the BTPSV-4F-based devices. The organic solar cells with BTPSeV-4F as acceptor demonstrate a higher power conversion efficiency of 14.2% with a record high short-circuit current density of 30.1 mA cm−2 and low energy loss of 0.55 eV benefitted from the low non-radiative energy loss due to the suppression of triplet exciton formation. We also develop a high-performance medium bandgap acceptor O1-Br for front cells. By integrating the PM6:O1-Br based front cells with the PTB7-Th:BTPSeV-4F based rear cells, the tandem organic solar cell demonstrates a power conversion efficiency of 19%. The results indicate that the suppression of triplet excitons formation in the near-infrared-absorbing acceptor by molecular design is an effective way to improve the photovoltaic performance of the tandem organic solar cells.

Date: 2023
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DOI: 10.1038/s41467-023-36917-y

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