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• W137496584 abstract "The present chapter deals with photoreactive thin films and describes processes to tune both surface and material properties by means of UV-irradiation. Selected applications of these materials as UV tunable interfaces in organic electronics are demonstrated. Two examples of photoreactive polymers together with the underlying photochemistry are presented. Polymers bearing aryl ester groups or N-arylamide units in their side-chain undergo the photo-Fries reaction under UV-light which yields hydroxyketone and aminoketone units as photoproducts, respectively. The reaction results in a change in surface polarity, which is accompanied by a significant increase in refractive index (Δn up to +0.10). Another example is given with polymers bearing ortho-nitrobenzyl ester units in their side chain. UV-irradiation causes the scission of the ester unit and the formation of polar carboxylic acids. Employing these photosensitive polymers as interfacial layers between the organic semiconductor and the gate dielectric, the characteristics of OTFTs such as carrier mobility and threshold voltage can be varied over a wide range. Moreover, the epitaxial growth of organic semiconductors (para-sexiphenyl and pentacene) on these surfaces can be influenced by photochemical adjustment of surface polarity. Proceeding from thin polymer layers to molecular layers, several examples for photoreactive mono- and oligolayers on metals and oxidic surfaces are presented. These layers, containing aryl ester units for example, were modified by UV illumination and post-exposure derivatization. Lithographic patterns in molecular layers were characterized with friction force microscopy.KeywordsRefractive Index ChangeRefractive Index ModulationAromatic EsterPhenyl EsterBifunctional MoleculeThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves." @default.
• W137496584 created "2016-06-24" @default.
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• W137496584 date "2013-01-01" @default.
• W137496584 modified "2023-10-03" @default.
• W137496584 title "Tuning Organic Electronics via Photoreactive Thin Organic Films" @default.
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• W137496584 doi "https://doi.org/10.1007/978-3-642-33848-9_6" @default.
• W137496584 hasPublicationYear "2013" @default.
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