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Updated: Jun 22, 2025
In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation
Published on: March 2, 2021
Selenophene-fused Perylene Diimide-Based Cathode Interlayer Enables 19 % Efficiency Binary Organic Solar Cells via
Zongtao Wang1,2, Helin Wang2, Lei Yang1
1School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China.
Abstract:
The cathode interlayer is crucial for the development of organic solar cells (OSCs), but the research on simple and efficient interlayer materials is lagging behind. Here, a donor-acceptor (D-A) typed selenophene-fused perylene diimide (PDI) derivative (SePDI3) is developed as cathode interlayer material (CIM) for OSCs, and a non-fused PDI derivative (PDI3) is used as the control CIM for comparison. Compared to PDI3, SePDI3 shows a stronger self-doping effect and better crystallinity, resulting in better charge transport ability. Furthermore, the interaction between SePDI3 and L8-BO can form an efficient extraction channel, leading to superior charge extraction behavior. Finally, benefitting from significantly enhanced charge transport and extraction capacity, the SePDI3-based device displays a champion PCE of 19.04 % with an ultrahigh fill factor of 81.65 % for binary OSCs based on PM6 : L8-BO active layer, which is one of the top efficiencies reported to date in binary OSCs based novel CIMs. Our work prescribes a facile and effective fusion strategy to develop high-efficiency CIMs for OSCs.
