While decreasing the oxide thickness in carbon nanotube field-effect transistors (CNFETs) improves the turn-on behavior, we demonstrate that this also requires scaling the range of the drain voltage. This scaling is needed to avoid an exponential increase in Off-current with drain voltage, due to modulation of the Schottky barriers at both the source and drain contact. We illustrate this with results for bottom-gated ambipolar CNFETs with oxides of 2 and 5 nm, and give an explicit scaling rule for the drain voltage. Above the drain voltage limit, the Off-current becomes large and has equal electron and hole contributions. This allows the recently reported light emission from appropriately biased CNFETs.
@article{arxiv.cond-mat/0305570,
title = {Drain Voltage Scaling in Carbon Nanotube Transistors},
author = {M. Radosavljevic and S. Heinze and J. Tersoff and Ph. Avouris},
journal= {arXiv preprint arXiv:cond-mat/0305570},
year = {2009}
}
Comments
4 pages, 4 EPS figure, to appear in Appl. Phys. Lett. (issue of 15 Sept 2003)