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• W1796787237 endingPage "16381" @default.
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• W1796787237 abstract "The electrical responses of a columnar liquid crystal (a diimidodiester derivative of benzo[ghi]perylene) deposited either by spin-coating or by thermal evaporation into a typical OLED device are compared. For the spin-coated film, homeotropic alignment was induced by thermal annealing, which enhanced the charge carrier mobility significantly. For the evaporated films, homeotropic alignment could not be obtained by annealing. However, a degree of rectification higher than 3 orders of magnitude was achieved, even without annealing, with an electrical response similar to the response of the aligned spin-coated film. A trap-limited space–charge-limited current model was used to extract the charge carrier mobility directly from the current–voltage curves. Grazing incidence wide-angle X-ray scattering confirmed the homeotropic alignment of the annealed spin-coated film, whereas the columns are mostly oriented parallel to the surface in the evaporated case. In a field-effect transistor with bottom-gate bottom-contact geometry, the evaporated film exhibited a typical behavior of an n-type transistor. The degree of intermolecular order is thereby strongly dependent on the deposition method where vacuum deposition leads to a higher order. This higher order, however, impedes reorientation by annealing of the evaporated film but leads to improved charge transport between the electrodes even without homeotropic alignment of columnar liquid crystal." @default.
• W1796787237 created "2016-06-24" @default.
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• W1796787237 date "2015-07-27" @default.
• W1796787237 modified "2023-10-16" @default.
• W1796787237 title "Thermal Evaporation versus Spin-Coating: Electrical Performance in Columnar Liquid Crystal OLEDs" @default.
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• W1796787237 doi "https://doi.org/10.1021/acsami.5b03496" @default.
• W1796787237 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/26168313" @default.
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