High performance tandem organic solar cells via a strongly infrared-absorbing narrow bandgap acceptor

Zhenrong Jia, Shucheng Qin, Lei Meng (), Qing Ma, Indunil Angunawela, Jinyuan Zhang, Xiaojun Li, Yakun He, Wenbin Lai, Ning Li, Harald Ade (), Christoph J. Brabec and Yongfang Li ()
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Zhenrong Jia: Chinese Academy of Sciences
Shucheng Qin: Chinese Academy of Sciences
Lei Meng: Chinese Academy of Sciences
Qing Ma: Chinese Academy of Sciences
Indunil Angunawela: North Carolina State University
Jinyuan Zhang: Chinese Academy of Sciences
Xiaojun Li: Chinese Academy of Sciences
Yakun He: Friedrich-Alexander University Erlangen-Nürnberg
Wenbin Lai: Chinese Academy of Sciences
Ning Li: Friedrich-Alexander University Erlangen-Nürnberg
Harald Ade: North Carolina State University
Christoph J. Brabec: Friedrich-Alexander University Erlangen-Nürnberg
Yongfang Li: Chinese Academy of Sciences

Nature Communications, 2021, vol. 12, issue 1, 1-10

Abstract: Abstract Tandem organic solar cells are based on the device structure monolithically connecting two solar cells to broaden overall absorption spectrum and utilize the photon energy more efficiently. Herein, we demonstrate a simple strategy of inserting a double bond between the central core and end groups of the small molecule acceptor Y6 to extend its conjugation length and absorption range. As a result, a new narrow bandgap acceptor BTPV-4F was synthesized with an optical bandgap of 1.21 eV. The single-junction devices based on BTPV-4F as acceptor achieved a power conversion efficiency of over 13.4% with a high short-circuit current density of 28.9 mA cm−2. With adopting BTPV-4F as the rear cell acceptor material, the resulting tandem devices reached a high power conversion efficiency of over 16.4% with good photostability. The results indicate that BTPV-4F is an efficient infrared-absorbing narrow bandgap acceptor and has great potential to be applied into tandem organic solar cells.

Date: 2021
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DOI: 10.1038/s41467-020-20431-6

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