A study involving a large number of carbon nanotube transistors reveals that the nanotube diameter and the metal contact material play key roles in determining the on- and off-state currents of these devices. The results are discussed in terms of the Schottky barrier at the metal-semiconductor junction and the variation of this barrier relative to the alignment of energy levels between the carbon nanotube and the metal.
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Tseng et al. (2006) studied this question.
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