Electronic and structural characterizations of a transparent conductive oxide/organic interface: Towards applications for organic electronic devices

Abstract : The energy level alignment of hole-transport organic molecular solids with indium tin oxide (ITO), a transparent conducting oxide, has been characterized. The studied molecules, based on the dipyranylidene (DIP) structure, differ by the heteroatom (O, S and Se). Synchrotron photoemission electron spectroscopy has been used to determine the alignment, and we investigated the molecular orientation via X-ray absorption spectromicroscopy. By interpreting spectroscopic data in the light of DFT calculations, we found evidence of the presence of charge transfer from the molecules to the ITO, when they are in intimate contact with the substrate, at least for the O and S-DIPs. The hole injection barrier between the ITO Fermi level and the organic HOMO was obtained. Our experimental approach emphasizes the relationship between structural and electronic properties. These results were obtained during beamtimes in France (SOLEIL), Italy (ELETTRA) and Switzerland (SLS).
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https://hal.sorbonne-universite.fr/tel-01686677
Contributor : Quentin Arnoux <>
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Quentin Arnoux. Electronic and structural characterizations of a transparent conductive oxide/organic interface: Towards applications for organic electronic devices. Chemical Physics [physics.chem-ph]. UPMC - Paris 6 Sorbonne Universités, 2017. English. ⟨tel-01686677⟩

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