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Title of article :
Impedance spectroscopy study of metal–organic–metal structures
Author/Authors :
Abd-El-Hakim Bekkali*، نويسنده , , Ilja Thurzo، نويسنده , , Thorsten U. Kampen، نويسنده , , Dietrich R.T. Zahn *، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2004
Pages :
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Abstract :
In this work we have investigated the dielectric properties of Ag/PTCDA/Ag structures using impedance spectroscopy (IS). An equivalent circuit is developed for the ac small-signal excitation with frequencies between 100 Hz–5 MHz. It is possible to fit the data at different dc biases without introducing any frequency-dependent element to the equivalent circuit. The space charge region at the bottom Ag contact strongly resembles Schottky-barrier behavior, while disorder induced interface dipoles seem to occur at the top Ag/PTCDA interface. For the latter one, the related energy distribution of density of states as deduced from the excess capacitance of this zone fairly matches a Gaussian profile. # 2004 Published by Elsevier B.V.
Keywords :
organic semiconductors , Schottky barrier , Interface states
Journal title :
Applied Surface Science
Journal title :
Applied Surface Science
Serial Year :
Link To Document :