Direct measurements of the AC performance of carbon nanotube field effect transistors

Abstract

The direct observation of carbon nanotubes field-effect transistors (CNFET) operating at several hundred MHz was discussed. Large sinusoidal signals at discrete frequencies were applied to the gate of the CNFET, and the output signal was observed on spectrum analysis. To minimize probe pad capacitance, the CNFETs were fabricated to a quartz substrate. The device was operated in common source (CS) and common gate (CG) configurations. Substraction of the crosstalk which correctly accounts for the phase leads to the frequency response, which is consistent with the CNFET being independent of frequency up to several MHz.