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

Abstract : 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.
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Submitted on : Wednesday, September 30, 2009 - 10:32:12 AM
Last modification on : Monday, December 14, 2020 - 9:49:06 AM
Long-term archiving on: : Tuesday, October 16, 2012 - 11:35:25 AM

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  • HAL Id : tel-00420915, version 1

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Julien Chaste. Transistors à nanotube de carbone unique : propriétés dynamiques et détection d'électrons uniques. Matière Condensée [cond-mat]. Université Pierre et Marie Curie - Paris VI, 2009. Français. ⟨tel-00420915⟩

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