13 March 2015 Flexo printed sol-gel derived vanadium oxide films as an interfacial hole-transporting layer for organic solar cells
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Proceedings Volume 9364, Oxide-based Materials and Devices VI; 93640K (2015); doi: 10.1117/12.2079270
Event: SPIE OPTO, 2015, San Francisco, California, United States
Abstract
In this paper we report on the synthesis and development of vanadium oxide precursor flexographic ink for the printing of hole-transporting layers in organic solar cells. For the synthesis of vanadium oxide inks, a sol-gel methodology was utilized. By modifying the vanadium alkoxide precursor with a right type of coordinating ligands a stable and flexoprintable ink has been successfully developed. Flexo-printing afforded smooth and uniform vanadium oxide sol-gel films on top of PCDTBT:PC70BM films. The conversion of the synthesized sol-gel film into a corresponding vanadium oxide layer was followed by DSC/TGA and XPS analyses. The inks were used for the fabrication of inverted organic solar cells by flexo-printing. Power conversion efficiencies ranging between 3.5 % and 4.5 % were achieved, which are slightly lower than the reference cells using vacuum-deposited MoO3 as the hole-transporting layers.
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Terho Kololuoma, Jiangping Lu, Salima Alem, Neil Graddage, Raluca Movileanu, Simona Moisa, Ye Tao, "Flexo printed sol-gel derived vanadium oxide films as an interfacial hole-transporting layer for organic solar cells", Proc. SPIE 9364, Oxide-based Materials and Devices VI, 93640K (13 March 2015); doi: 10.1117/12.2079270; http://dx.doi.org/10.1117/12.2079270
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KEYWORDS
Vanadium

Oxides

Solar cells

Sol-gels

Metals

Printing

Organic photovoltaics

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