Transistors à nanotube de carbone unique : propriétés dynamiques et détection d'électrons uniques

摘要

This PHD, done at LPA by Julien Chaste, introduces the dynamic analysis of a carbon nanotube field effect transistor (NT-FET). The objective is the measurement of the NT-FET charge resolution δqrms.Quantization in the nanotube affects both the conductance, the transconductance gm, the gate capacitance Cg and especially the cut-off frequency ωt=gm/Cg by the kinetic inductance effect.The two experimental set-ups, at 4K and at 300K, and the NT-FET sample fabrication integrated powerful solutions to solve the impedance matching problem and allowed to measure the transmission between 0,1 and 1,6GHz as well as gm,Cg et ωt. Cut-off frequencies of 50GHz were even measured.Furthermore the transistor noise coloration (0,2-0,8GHz) has been characterized at 4K. The ON-state noise has a poissonian origin (F=1) and shows some saturation effects due to optical phonons.All this work can be summarized by the value δqrms of the NT-FET charge resolution which is low enough to detect one charge in one nanosecond.