Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-10-29
Nano Lett. 9, 312 (2009)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
6 pages, 6 figures
Scientific paper
Carbon nanotubes (CNTs) have large intrinsic carrier mobility due to weak acoustic phonon scattering. However, unlike two-dimensional metal-oxide-semiconductor field effect transistors (MOSFETs), substrate surface polar phonon (SPP) scattering has a dramatic effect on the CNTFET mobility, due to the reduced vertical dimensions of the latter. We find that for the Van der Waals distance between CNT and an SiO$_2$ substrate, the low-field mobility at room temperature is reduced by almost an order of magnitude depending on the tube diameter. We predict additional experimental signatures of the SPP mechanism in dependence of the mobility on density, temperature, tube diameter, and CNT - substrate separation.
Avouris Phaedon
Perebeinos Vasili
Petrov Alexey G.
Rotkin Slava
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