Electrical conductivity in metal/3,4,9,10-perylenetetracarboxylic dianhydride/metal structures
Identifieur interne : 00C384 ( Main/Repository ); précédent : 00C383; suivant : 00C385Electrical conductivity in metal/3,4,9,10-perylenetetracarboxylic dianhydride/metal structures
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Abstract
Samples comprising 1-μm-thick layers of 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) sandwiched between top-most In contact and bottom-most Ag contact were synthesized on n-Si(100) substrates. Current-voltage (I-V) characteristics were measured on the structures with all the layers evaporated in sequence, and on the structures with air exposed PTCDA/In and Ag/PTCDA interfaces. The current transport in the structures fabricated without interruption of vacuum is controlled by the space charge and by the traps. Air exposure of the In/PTCDA interface introduces additional trap sites in the PTCDA layer, yielding the space-charge-limited current in the presence of traps, exponentially distributed in energy, and with a hopping transport mobility. Air exposure of the Ag/PTCDA interface introduces a discrete level of traps in addition to exponentially distributed traps. © 2003 American Institute of Physics.
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<author><name sortKey="Hudej, Robert" uniqKey="Hudej R">Robert Hudej</name>
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<author><name sortKey="Bratina, Gvido" uniqKey="Bratina G">Gvido Bratina</name>
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<front><div type="abstract" xml:lang="en">Samples comprising 1-μm-thick layers of 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) sandwiched between top-most In contact and bottom-most Ag contact were synthesized on n-Si(100) substrates. Current-voltage (I-V) characteristics were measured on the structures with all the layers evaporated in sequence, and on the structures with air exposed PTCDA/In and Ag/PTCDA interfaces. The current transport in the structures fabricated without interruption of vacuum is controlled by the space charge and by the traps. Air exposure of the In/PTCDA interface introduces additional trap sites in the PTCDA layer, yielding the space-charge-limited current in the presence of traps, exponentially distributed in energy, and with a hopping transport mobility. Air exposure of the Ag/PTCDA interface introduces a discrete level of traps in addition to exponentially distributed traps. © 2003 American Institute of Physics.</div>
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