A Compact Physical Drain Current Model of Multitube Carbon Nanotube Field Effect Transistor Including Diameter Dispersion Effects

Carbon nanotube field-effect transistor (CNTFET) shows great potential for digital and analog applications due to the unique 1-D ballistic carrier transport in carbon nanotubes (CNTs). A new compact physical model for CNT Schottky-barrier transistors is proposed in this article. The Schottky barrier between the contact metal and CNTs is described by using an effective barrier height, and more importantly, the influence of using CNT arrays or networks rather than a single CNT as the device channel is considered in this model. Moreover, the trapping effect is investigated and modeled by adding RC delay element to the equivalent circuit. The model is proposed in a concise form to avoid complex operations such as integration and is compatible with circuit simulation. The simulation results of I - V characteristics are verified to be in agreement with experimental data.