Donor–acceptor mutually diluted heterojunctions for layer-by-layer fabrication of high-performance organic solar cells

Liang Wang, Chen Chen, Yiwei Fu, Chuanhang Guo, Donghui Li, Jingchao Cheng, Wei Sun, Zirui Gan, Yuandong Sun, Bojun Zhou, Chenghao Liu, Dan Liu, Wei Li and Tao Wang ()
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Liang Wang: Wuhan University of Technology
Chen Chen: Wuhan University of Technology
Yiwei Fu: Wuhan University of Technology
Chuanhang Guo: Wuhan University of Technology
Donghui Li: Wuhan University of Technology
Jingchao Cheng: Wuhan University of Technology
Wei Sun: Wuhan University of Technology
Zirui Gan: Wuhan University of Technology
Yuandong Sun: Wuhan University of Technology
Bojun Zhou: Wuhan University of Technology
Chenghao Liu: Wuhan University of Technology
Dan Liu: Wuhan University of Technology
Wei Li: Wuhan University of Technology
Tao Wang: Wuhan University of Technology

Nature Energy, 2024, vol. 9, issue 2, 208-218

Abstract: Abstract The photoactive layer of organic solar cells consists of p-type electron donors and n-type electron acceptors, which phase separate to form fine and continuous networks for charge transport. The impact of the donor–acceptor interaction on the microstructure and optoelectronics of the photoactive layer remains unclear. In this work, a tiny amount (1 wt%) of donor PM6 is added into the non-fullerene acceptor (NFA) C8-R or L8-BO (or vice versa) to form a donor (or acceptor) diluted heterojunction. The structural order is improved through dipole–dipole interaction between the donor and the acceptor owing to their opposite electronegativity. We fabricate a pseudo-bilayer heterojunction solar cell based on NFA-diluted donor (that is, donor + 1% NFA) and donor-diluted NFA (that is, NFA + 1% donor) layers: the device exhibits superior power conversion efficiencies compared with their bulk heterojunction and conventional pseudo-bilayer counterparts. We demonstrate an efficiency of 19.4% (certified 19.1%) and 17.6% for 100 and 300 nm-thick PM6 + 1% L8-BO/L8-BO + 1% PM6 solar cells, respectively.

Date: 2024
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DOI: 10.1038/s41560-023-01436-z

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