Current-voltage Characteristics of Molecular Conductors: Two versus Three Terminal

Details Current-voltage Characteristics of Molecular Conductors: Two versus Three Terminal Current-voltage Characteristics of Molecular Conductors: Two versus Three Terminal

2002-06-18

arxiv.org/abs/cond-mat/0206328v3

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 9 figures. Major changes in text. One new result added (Fig 8). Accepted for publication in IEEE Trans. on Nanotechno

Scientific paper

10.1109/TNANO.2002.806825

This paper addresses the question of whether a ``rigid molecule'' (one which does not deform in an external field) used as the conducting channel in a standard three-terminal MOSFET configuration can offer any performance advantage relative to a standard silicon MOSFET. A self-consistent solution of coupled quantum transport and Poisson's equations shows that even for extremely small channel lengths (about 1 nm), a ``well-tempered'' molecular FET demands much the same electrostatic considerations as a ``well-tempered'' conventional MOSFET. In other words, we show that just as in a conventional MOSFET, the gate oxide thickness needs to be much smaller than the channel length (length of the molecule) for the gate control to be effective. Furthermore, we show that a rigid molecule with metallic source and drain contacts has a temperature independent subthreshold slope much larger than 60 mV/decade, because the metal-induced gap states in the channel prevent it from turning off abruptly. However, this disadvantage can be overcome by using semiconductor contacts because of their band-limited nature.

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