Journal
APPLIED PHYSICS LETTERS
Volume 91, Issue 1, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2752024
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The authors report negative capacitance at low frequencies in organic semiconductor based diodes and show that it appears only under bipolar injection conditions. They account quantitatively for this phenomenon by the recombination current due to electron-hole annihilation. Simple addition of the recombination current to the well established model of space charge limited current in the presence of traps yields excellent fits to the experimentally measured admittance data. The dependence of the extracted characteristic recombination time on the bias voltage is indicative of a recombination process which is mediated by localized traps. (c) 2007 American Institute of Physics.
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