Patching defects in the active layer of large-area organic solar cells

Large area fabrication of organic solar cells is critical to achieve sufficient energy for power applications. However, large-area organic solar cells still suffer from low production yields because their thin active layer (100300 nm) is prone to form leakage current when film defects exist in the a...

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Veröffentlicht in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2018-04, Vol.6 (14), p.5817-5824
Hauptverfasser: Mao, Lin, Sun, Lulu, Luo, Bangwu, Jiang, Youyu, Zhou, Yinhua
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container_end_page 5824
container_issue 14
container_start_page 5817
container_title Journal of materials chemistry. A, Materials for energy and sustainability
container_volume 6
creator Mao, Lin
Sun, Lulu
Luo, Bangwu
Jiang, Youyu
Zhou, Yinhua
description Large area fabrication of organic solar cells is critical to achieve sufficient energy for power applications. However, large-area organic solar cells still suffer from low production yields because their thin active layer (100300 nm) is prone to form leakage current when film defects exist in the active layer. In this study, we proposed a novel strategy to patch the defects to suppress the leakage current and improve the device yield of large-area organic solar cells. The defects in the active layers have been patched by coating an insulating polymer using a Maobi tool that has the advantage of patterning and ink holding. Insulating polymers including polyethylenimine (PEI), polyvinyl alcohol (PVA), and polymethylmethacrylate (PMMA) have been used to patch the defects. Electrical insulativity, solution processability, solvent orthogonality to the active layer, good wetting on the active layer, and chemical inactivity with the active layer and interfacial layer are important properties for a good candidate used for patching the defects. The patching strategy is applicable to both fullerene-based and non-fullerene-based solar cells and can effectively restore the photovoltaic properties of the active layers with defects. Finally, we have demonstrated the construction of large-area (up to 52 cm 2 ) monolithic none-fullerene organic solar cells with the assistance of the proposed patching strategy. Polar-solvent-soluble, electrical-insulating polymers were used to patch the defects inside the active layer via a Maobi coating to enhance the device yield for large-area organic solar cells.
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The patching strategy is applicable to both fullerene-based and non-fullerene-based solar cells and can effectively restore the photovoltaic properties of the active layers with defects. Finally, we have demonstrated the construction of large-area (up to 52 cm 2 ) monolithic none-fullerene organic solar cells with the assistance of the proposed patching strategy. 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source Royal Society Of Chemistry Journals 2008-
subjects Alcohols
Defects
Fabrication
Fullerenes
Leakage
Leakage current
Orthogonality
Patching
Photovoltaic cells
Photovoltaics
Polyethyleneimine
Polymers
Polymethyl methacrylate
Polymethylmethacrylate
Polyvinyl alcohol
Solar cells
Solar power
Strategy
title Patching defects in the active layer of large-area organic solar cells
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