PVP a binder for the manufacture of ultrathin ITO/polymer nanocomposite films with improved electrical conductivity
This paper presents the manufacture of ultrathin (<1 µm) transparent conductive indium tin oxide (ITO) films based on nanoparticulate ITO slurries by the profile rod technique using the binder polyvinyl pyrrolidone (PVP) as an organic additive. The influence of the slurry composition on the film thickness and the specific electrical resistance as well as the transmission of the dried films is evaluated. The organic solvent ethanol and different types of the PVP binder were tested for slurry preparation and layer performance. ITO green films with low specific electrical resistance of 3 Ω cm, 87 % inline transmission, and layer thicknesses of only 250 nm could be manufactured. Furthermore, the influence of heat treatments up to 400 °C on the electrical properties of the ITO films was evaluated.
KeywordsCasting Speed Specific Electrical Resistance Green Tape Green Film Slurry Composition
The financial support of the German Research Foundation (DFG, Graduiertenkolleg 1161), as well as the support of our industrial partner Evonik Industries AG, Essen, Germany, is gratefully acknowledged. The authors thank Rubitha Srikantharajah for the scanning electron microscope images of the dried ITO agglomerates (Figs. 7, 9).
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