High performance polymerized small molecule acceptor by synergistic optimization on π-bridge linker and side chain

Guangpei Sun, Xin Jiang, Xiaojun Li (), Lei Meng (), Jinyuan Zhang, Shucheng Qin, Xiaolei Kong, Jing Li, Jingming Xin, Wei Ma and Yongfang Li ()
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Guangpei Sun: Chinese Academy of Sciences
Xin Jiang: Chinese Academy of Sciences
Xiaojun Li: Chinese Academy of Sciences
Lei Meng: Chinese Academy of Sciences
Jinyuan Zhang: Chinese Academy of Sciences
Shucheng Qin: Chinese Academy of Sciences
Xiaolei Kong: Chinese Academy of Sciences
Jing Li: Chinese Academy of Sciences
Jingming Xin: Xi’an Jiaotong University
Wei Ma: Xi’an Jiaotong University
Yongfang Li: Chinese Academy of Sciences

Nature Communications, 2022, vol. 13, issue 1, 1-11

Abstract: Abstract The polymerized small-molecule acceptors have attracted great attention for application as polymer acceptor in all-polymer solar cells recently. The modification of small molecule acceptor building block and the π-bridge linker is an effective strategy to improve the photovoltaic performance of the polymer acceptors. In this work, we synthesized a new polymer acceptor PG-IT2F which is a modification of the representative polymer acceptor PY-IT by replacing its upper linear alkyl side chains on the small molecule building block with branched alkyl chains and attaching difluorene substituents on its thiophene π-bridge linker. Through this synergistic optimization, PG-IT2F possesses more suitable phase separation, increased charge transportation, better exciton dissociation, lower bimolecular recombination, and longer charge transfer state lifetime than PY-IT in their polymer solar cells with PM6 as polymer donor. Therefore, the devices based on PM6:PG-IT2F demonstrated a high power conversion efficiency of 17.24%, which is one of the highest efficiency reported for the binary all polymer solar cells to date. This work indicates that the synergistic regulation of small molecule acceptor building block and π-bridge linker plays a key role in designing and developing highly efficient polymer acceptors.

Date: 2022
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DOI: 10.1038/s41467-022-32964-z

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