Journal
APPLIED PHYSICS LETTERS
Volume 92, Issue 21, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2936301
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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 data are in excellent agreement with data obtained by the time-of-flight technique. (C) 2008 American Institute of Physics.
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