Abstract
Estimation of total channel charge (Q Tot ) of carbon nanotube field effect transistor from the self-consistently computed charge density (Q Top ) at the top of conduction band subband minima, is found to be inaccurate. A regional approach based on extended ballistic transport theory is proposed to model Q Tot , and its partitioning into source and drain components. The models for charges and subsequently derived capacitances are validated with the numerically simulated data obtained using semi-classical technique. The model agreement with numerical data shows the superiority of our regional approach compared to ones obtained from only the information of Q Top .
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