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Fabrication And Investigation Of Asymmetric Current-voltage Characteristics Of A Metal/Langmuir-Blodgett Monolayer/metal Structure

N. J. Geddes, J. Sambles, D. Jarvis, W. G. Parker, D. Sandman
Published 1990 · Physics

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Metal/Langmuir–Blodgett monolayer/metal devices, where the monolayer consists of the dodecyloxyphenylcarbamate of 2‐bromo, 5(2’‐hydroxyethoxy) tetracyanoquinodimethan, a donor‐σ‐acceptor molecular system, have been constructed, and dc current‐voltage (I‐V) characteristics of these devices were recorded at room temperature. For biases of ±20 mV, the I‐V characteristics are linear, changing to a nonlinear form for higher voltages. This nonlinear characteristic exhibited a ln(I)∝V1/4 dependence for both positive and negative voltages up to ±1 V. For positive voltages >+2.0 V for as‐prepared devices and >+1.5 V for annealed devices, a ln(I)∝V3 dependence was observed, revealing a very large increase in current for small voltage changes. Such behavior was not observed for corresponding negative voltages, indicating rectification across a distance approximated by the length of an individual molecule.
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