19.31% binary organic solar cell and low non-radiative recombination enabled by non-monotonic intermediate state transition

Jiehao Fu, Patrick W. K. Fong, Heng Liu, Chieh-Szu Huang, Xinhui Lu, Shirong Lu, Maged Abdelsamie, Tim Kodalle, Carolin M. Sutter-Fella, Yang Yang () and Gang Li ()
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Jiehao Fu: The Hong Kong Polytechnic University, Hung Hom
Patrick W. K. Fong: The Hong Kong Polytechnic University, Hung Hom
Heng Liu: The Chinese University of Hong Kong
Chieh-Szu Huang: University of California Los Angeles (UCLA)
Xinhui Lu: The Chinese University of Hong Kong
Shirong Lu: Taizhou University
Maged Abdelsamie: Lawrence Berkeley National Laboratory
Tim Kodalle: Lawrence Berkeley National Laboratory
Carolin M. Sutter-Fella: Lawrence Berkeley National Laboratory
Yang Yang: University of California Los Angeles (UCLA)
Gang Li: The Hong Kong Polytechnic University, Hung Hom

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

Abstract: Abstract Non-fullerene acceptors based organic solar cells represent the frontier of the field, owing to both the materials and morphology manipulation innovations. Non-radiative recombination loss suppression and performance boosting are in the center of organic solar cell research. Here, we developed a non-monotonic intermediate state manipulation strategy for state-of-the-art organic solar cells by employing 1,3,5-trichlorobenzene as crystallization regulator, which optimizes the film crystallization process, regulates the self-organization of bulk-heterojunction in a non-monotonic manner, i.e., first enhancing and then relaxing the molecular aggregation. As a result, the excessive aggregation of non-fullerene acceptors is avoided and we have achieved efficient organic solar cells with reduced non-radiative recombination loss. In PM6:BTP-eC9 organic solar cell, our strategy successfully offers a record binary organic solar cell efficiency of 19.31% (18.93% certified) with very low non-radiative recombination loss of 0.190 eV. And lower non-radiative recombination loss of 0.168 eV is further achieved in PM1:BTP-eC9 organic solar cell (19.10% efficiency), giving great promise to future organic solar cell research.

Date: 2023
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DOI: 10.1038/s41467-023-37526-5

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