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DY: Fachverband Dynamik und Statistische Physik

DY 2: Statistical Physics (General)

DY 2.9: Vortrag

Montag, 26. März 2012, 12:00–12:15, MA 004

Study of transistor performance of carbon nanotube networks — Milan Žeželj, •Igor Stanković, and Aleksandar Belić — Institute of Physics Belgrade, Scientific Computing Laboratory

In the random networks of mixed metallic and semiconducting carbon nanotube (CNT) with different chiralities, there is a trade off between high on-current (dense networks) and high on/off current ratio (sparse networks). Monte Carlo simulations were performed to study effects of nanotube/nanotube contact resistance on the on- and off-currents. Using tunneling model we confirm that junction conductance between two CNTs is strongly dependent on the crossing angle. The nanotubes exhibit a peak of conductivity over the different angular ranges depending on their chiralities. We analyze how percolation threshold density of CNTs, conductivity exponents and prefactors depend on the position and width of conductive peak. Furthermore, when network size is comparable to a single CNT length, we find a significant size dependence of the on/off currents and their variance.