Ñêà÷àòü ïîëíóþ âåðñèþ ñòàòüè (â PDF ôîðìàòå)
Ya. R. ZELINS’KYI, Eh. G. PETROV, and V. I. TESLENKO
«Control of Microcurrents in Nanomolecules by Variation of Coupling of Molecule and Electrodes»
015–027 (2009)
PACS numbers: 05.60.Gg, 73.23.Hk, 73.63.Rt, 85.35.Gv, 85.65.+h
Kinetics model is proposed to describe combined elastic and inelastic hopping electron transmission through a short molecular wire for the case of strong Coulomb repulsion between the transferred electrons. As shown, the current formation occurs through concurrence of two mechanisms: elastic inter-electrode tunnelling through localized energy levels of terminal groups of the wire and inelastic hopping process between electrodes and centres of electron localization. Analytical expression for steady current is obtained, and impact of elastic and inelastic electron transmission on current–voltage characteristics of the wire is investigated. An effect of current blockage caused by both participation of localized energy levels of the wire in electron transmission and influence of superexchange between the terminal links of molecular circuit is detected. As shown in the case of molecule–electrode coupling asymmetry, a current rectification effect takes place.
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