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    Effects of interfacial modification for vapor phase polymerized PEDOT on glass substrate

    Year: 2020

    Journal: Synth. Met., Volume 260, FEB

    Authors: Li, Boxiao; Skorenko, Kenneth H.; Qiu, Haian; Mativetsky, Jeffrey M.; Dwyer, Derek B.; Bernier, William E.; Jones, Wayne E., Jr.

    Organizations: Integrated Electronics Engineering Center (IEEC) [IEEC066]

    Keywords: EDOT grafting; Adhesion; Vapor phase polymerization; Sulfuric acid doping; Conductive polymer; Transparent conductive thin film

    Optically transparent and highly conductive poly(3,4-ethylenedioxythiophene) (PEDOT) thin films were grown through vapor phase polymerization on (3-Mercaptopropyl)trimethoxysilane functionalized 3,4-Ethylenedioxythiophene (MPTMS functionalized EDOT) grafted glass substrates. Compared to bare glass, the EDOT grafted surface led to enhancements in both electrical conductivity and adhesion of PEDOT thin films. A quinoid-rich structure with increased crystallinity and a further enhanced conductivity was induced by post-deposition sulfuric acid doping. X-ray diffraction showed different orientations of the PEDOT crystals grown on substrates with and without EDOT grafting. The highest conductivity of 2690 S/cm, with an average optical transmittance of 95.4 % in the visible range, was achieved when PEDOT was vapor phase polymerized on EDOT grafted substrates and doped with 98 % sulfuric acid. Photostability was tested using a xenon arc light source and characterized by attenuated total reflection Fourier-transform infrared spectroscopy, showing that photoinduced degradation is associated with a decrease in C=C double bond content.
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