Improved photovoltaic performance and robustness of all-polymer solar cells enabled by a polyfullerene guest acceptor

Han Yu, Yan Wang, Xinhui Zou, Junli Yin, Xiaoyu Shi, Yuhao Li, Heng Zhao, Lingyuan Wang, Ho Ming Ng, Bosen Zou, Xinhui Lu, Kam Sing Wong (), Wei Ma, Zonglong Zhu (), He Yan () and Shangshang Chen ()
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Han Yu: Nanjing University
Yan Wang: City University of Hong Kong
Xinhui Zou: Hong Kong University of Science and Technology, Clear Water Bay
Junli Yin: Nanjing University
Xiaoyu Shi: Nanjing University
Yuhao Li: Chinese University of Hong Kong
Heng Zhao: Xi’an Jiaotong University
Lingyuan Wang: Nanjing University
Ho Ming Ng: Hong Kong University of Science and Technology, Clear Water Bay
Bosen Zou: Hong Kong University of Science and Technology, Clear Water Bay
Xinhui Lu: Chinese University of Hong Kong
Kam Sing Wong: Hong Kong University of Science and Technology, Clear Water Bay
Wei Ma: Xi’an Jiaotong University
Zonglong Zhu: City University of Hong Kong
He Yan: Hong Kong University of Science and Technology, Clear Water Bay
Shangshang Chen: Nanjing University

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract Fullerene acceptors typically possess excellent electron-transporting properties and can work as guest components in ternary organic solar cells to enhance the charge extraction and efficiencies. However, conventional fullerene small molecules typically suffer from undesirable segregation and dimerization, thus limiting their applications in organic solar cells. Herein we report the use of a poly(fullerene-alt-xylene) acceptor (PFBO-C12) as guest component enables a significant efficiency increase from 16.9% for binary cells to 18.0% for ternary all-polymer solar cells. Ultrafast optic and optoelectronic studies unveil that PFBO-C12 can facilitate hole transfer and suppress charge recombination. Morphological investigations show that the ternary blends maintain a favorable morphology with high crystallinity and smaller domain size. Meanwhile, the introduction of PFBO-C12 reduces voltage loss and enables all-polymer solar cells with excellent light stability and mechanical durability in flexible devices. This work demonstrates that introducing polyfullerenes as guest components is an effective approach to achieving highly efficient ternary all-polymer solar cells with good stability and mechanical robustness.

Date: 2023
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DOI: 10.1038/s41467-023-37738-9

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