Equivalent circuit model for carbon nanotube Schottky barrier: Influence of neutral polarized gas molecules

Abstract

An equivalent circuit model is proposed for the Schottky barrier at the junction between a metallic electrode and a semiconducting carbon nanotube (NT). We have applied the model to a gold-NT junction under the presence of neutral polarized NH3 molecules, and have shown that visible Schottky barrier modulation is possible for the gas densities as low as 3× 1013 cm-2, which is quite feasible experimentally. © 2006 American Institute of Physics.