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Eh. G. PETROV, E. V. SHEVCHENKO, and V. I. TESLENKO
«Nonresonance Electron Tunnelling through Molecular Films in Strong Electric Field»
731–744 (2008)

PACS numbers: 72.10.-d, 73.40.Gk, 73.50.Bk, 73.61.Ph, 85.65.+h

Process of the current formation through a chain molecule with saturated chemical bonds is studied for the case of off-resonant electron transmission. As shown, the electron delocalization over molecule forms a rectangular energy barrier for electron tunnelling in a wide range of molecular-chain length. The height of this barrier depends linearly on the voltage applied to electrodes. The conditions for such tunnelling mode are determined. Analytical expressions for the current through the molecule as well as the molecule conductance are obtained. As shown, the nonlinearity of the current–voltage characteristics of the molecular line rises sharply with the increase of the molecular-chain length.