2 September 2008 Charge injecting layers for admittance spectroscopy
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Admittance spectroscopy is a simple yet powerful tool to determine the carrier mobility of organic compounds. One requirement is to have an Ohmic contact for charge injection. By employing a thin interfacial layer of tungsten oxide or molybdenum oxide we have found a possibility to efficiently inject holes into organic materials with a deep highest occupied molecular orbital level down to 6.3 eV. These results considerably enhance the application range of the admittance spectroscopy method. The measured mobility data are in excellent agreement with data obtained by the time-of-flight technique. To efficiently inject electrons into materials with an ionization potential of up to 2.7 eV we thermally evaporated an intermediate layer of cesium carbonate and discuss the extracted electron mobilities.
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M. Hoping, M. Hoping, C. Schildknecht, C. Schildknecht, H. Gargouri, H. Gargouri, T. Riedl, T. Riedl, M. Tilgner, M. Tilgner, H.-H. Johannes, H.-H. Johannes, W. Kowalsky, W. Kowalsky, } "Charge injecting layers for admittance spectroscopy", Proc. SPIE 7051, Organic Light Emitting Materials and Devices XII, 70511D (2 September 2008); doi: 10.1117/12.794180; https://doi.org/10.1117/12.794180

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