Noniterative Compact Modeling for Intrinsic Carbon-Nanotube FETs: Quantum Capacitance and Ballistic Transport

In this paper, an analytical model of intrinsic carbon-nanotube field-effect transistors is presented. The origins of the channel carriers are analyzed in the ballistic limit. A noniterative surface-potential model is developed based on an analytical electrostatic model and a piecewise constant quantum-capacitance model. The model is computationally efficient with no iteration or numerical integration involved, thus facilitating fast circuit simulation and system optimization. Essential physics such as drain-induced barrier lowering and quantum capacitance are captured with reasonable accuracy.