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Mutual Diffusion of Model Acceptor/Donor Bilayers under Solvent Vapor Annealing as a Novel Route for Organic Solar Cell Fabrication

Author

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  • Paweł Dąbczyński

    (Faculty of Physics Astronomy and Applied Computer Science, Jagiellonian University, ul. Łojasiewicza 11, 30-348 Kraków, Poland)

  • Gabriela Wójtowicz

    (Faculty of Physics Astronomy and Applied Computer Science, Jagiellonian University, ul. Łojasiewicza 11, 30-348 Kraków, Poland)

  • Jakub Rysz

    (Faculty of Physics Astronomy and Applied Computer Science, Jagiellonian University, ul. Łojasiewicza 11, 30-348 Kraków, Poland)

Abstract

The fabrication of bulk heterojunction organic solar cells (OSCs) is primarily based on a phase demixing during solution deposition. This spontaneous process is triggered when, as a result of a decrease in the solvent concentration, interactions between donor and acceptor molecules begin to dominate. Herein, we present that interdiffusion of the same molecules is possible when a bilayers of donors and acceptors are exposed to solvent vapor. Poly(3-hexyl thiophene) (P3HT), and poly[N-9′-heptadecanyl-2,7-carbazole-alt-5,5-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole) (PCDTBT) were used as donors and two types of fullerene derivatives were used as acceptors: phenyl-C61-butyric acid methyl ester (PC 60 BM) and phenyl-C71-butyric acid methyl ester (PC 70 BM), Secondary ion mass spectrometry depth profiling revealed that the interpenetration of donors and acceptors induced by solvent vapor annealing was dependent on solvent vapor and component compatibility. Exposure to chloroform vapor resulted in a complete intermixing of both components. The mutual mixing increased efficiency of inverted solar cells prepared by solvent vapor annealing of model donor/acceptor bilayers. These results provide a new means for mixing incompatible components for the fabrication of organic solar cells.

Suggested Citation

  • Paweł Dąbczyński & Gabriela Wójtowicz & Jakub Rysz, 2022. "Mutual Diffusion of Model Acceptor/Donor Bilayers under Solvent Vapor Annealing as a Novel Route for Organic Solar Cell Fabrication," Energies, MDPI, vol. 15(3), pages 1-14, January.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:3:p:1033-:d:738511
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    References listed on IDEAS

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    1. Andrej Classen & Christos L. Chochos & Larry Lüer & Vasilis G. Gregoriou & Jonas Wortmann & Andres Osvet & Karen Forberich & Iain McCulloch & Thomas Heumüller & Christoph J. Brabec, 2020. "The role of exciton lifetime for charge generation in organic solar cells at negligible energy-level offsets," Nature Energy, Nature, vol. 5(9), pages 711-719, September.
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    Cited by:

    1. Qiuju Liang & Haodong Lu & Yinxia Chang & Zemin He & Yuzhen Zhao & Jiangang Liu, 2022. "Morphology Control in Organic Solar Cells," Energies, MDPI, vol. 15(15), pages 1-3, July.

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