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Current Rectification, Switching, Polarons, and Defects in Molecular Electronic Devices

Current Rectification, Switching, Polarons, and Defects in Molecular Electronic Devices,10.1007/978-1-4020-6348-0_16,A. M. Bratkovsky

Current Rectification, Switching, Polarons, and Defects in Molecular Electronic Devices   (Citations: 3)
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Devices for nano- and molecular-size electronics are currently a focus of research aimed at an efficient current rectification and switching. A few generic molecular scale devices are reviewed here on the basis of first-principles and model approaches. Current rectification by (ballistic) molecular quantum dots can produce the rectification ratio ≤100. Current switching due to conformational changes in the molecules is slow, on the order of a few kHz. Fast switching (~1 THz) may be achieved, at least in principle, in a degenerate molecular quantum dot with strong coupling of electrons with vibrational excitations. We show that the mean-field approach fails to properly describe intrinsicmolecular switching and present an exact solution to the problem. Defects in molecular films result in spurious peaks in conductance, apparent negative differential resistance, and may also lead to unusual temperature and bias dependence of current. The observed switching in many cases is extrinsic, caused by changes in molecule-electrode geometry, molecule reconfiguration, metallic filament formation through, and/or changing amount of disorder in a molecular film. We give experimental examples of telegraph ‘switching’ and ‘hot spot’ formation in molecular films.
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    • ...Here we revisit a model for such phenomena that was previously advanced[1] and later criticized[2, 3, 4] in order to eludidate and clarify some of its mathematical characteristics...
    • ...Invoking the second case as one of the possible mechanisms of hysteresis, switching, and negative differential resistance in molecular junctions[1] was criticized by Alexandrov and Bratkovsky, in several papers.[2, 3, 4] These authors claim that the conclusions of Ref...
    • ...[2, 3, 4] as incompatible with observations made in the isolated molecule...
    • ...As was pointed out by Alexandrov and Bratkovsky[2, 3, 4] the electronic level shift, �, is independent of level population for the isolated molecule, and no multistability is possible in this case...
    • ...[2, 3, 4]), but rather describes the interaction of a tunneling electron with its predecessor(s) via the phonon polarization cloud created by the electronic transient density of the molecule...

    Michael Galperinet al. The non-linear response of molecular junctions: the polaron model revi...

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