Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2006-06-30
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
to appear in IEEE Trans. on Electron Devics
Scientific paper
10.1109/TED.2006.882034
The effect of phonon scattering on the intrinsic delay and cut-off frequency of Schottky barrier carbon nanotube (CNT) FETs is examined by self-consistently solving the Poisson equation and the Schrodinger equation using the non-equilibrium Greens function (NEGF) formalism. Carriers are mostly scattered by optical and zone boundary phonons beyond the beginning of the channel. We show that the scattering has a small direct effect on the DC on-current of the CNTFET, but it results in significant pile-up of charge and degradation of average carrier velocity. Due to charge pile-up and random walks of carriers, the intrinsic gate capacitance and delay significantly increase, and the intrinsic cut-off frequency decreases. The results are important for assessing the performance potential of CNTFETs for radio-frequency (RF) electronics and digital electronics applications.
Guo Jing
Ouyang* Yijian
Yoon* Youngki
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