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Transport électronique dans des nanocassures pour la réalisation de transistors à molécule unique

Abstract : The main issue in molecular electronics is connecting a molecule to a macroscopic device. The goal of this thesis is to study electronic transport in metallic nanogaps, host structures for the molecules and then to insert a molecule to realize a molecular transistor. The knowledge of transport properties of the host structure is a key point for the molecular transistor realization and the understanding of its electronic properties. Nanogaps are obtained by electromigration of a gold nanowire. When a large current density flows through the nanowire, gold atoms start to move, and eventually breaking the nanowire. The controlled electromigration process developed during this thesis is performed at room temperature, and by limiting atomic displacements, one can obtain a nanometric size gap. The sample is then cooled at 4K to limit any diffusion process which could damage the nanogap, and it is electrically characterized. Fitting the I-V curves by a tunneling model allows us to determinate the electrodes work functions and the inter-electrodes distance, distance to be compared to the molecule size. This characterization may also be used to detect the presence of metallic clusters trapped between the electrodes during the electromigration. The last stage of the molecular transistor realization is the insertion of a single molecule in the gap. This is made in-situ at 4K, under vacuum, by sublimation of a C60 powder by Joule effect. The first tests show that it is possible to obtain a layer of molecules without damaging the nanogap.
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Submitted on : Sunday, September 5, 2010 - 6:19:57 PM
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Aurore Mangin. Transport électronique dans des nanocassures pour la réalisation de transistors à molécule unique. Physique [physics]. Université Paris-Diderot - Paris VII, 2009. Français. ⟨tel-00515127⟩

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