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Theses

Luminescence induite par microscopie à effet tunnel et étude des propriétés électroniques, chimiques et optiques de la surface de carbure de silicium 6H-SiC(0001)3x3

Abstract : The scanning tunnelling microscope (STM) enables both spatial and spectroscopic investigations of surfaces at the atomic scale. Light emission by the tunnel junction was demonstrated not long after the STM invention and contains valuable information on the electronic and optical properties of surfaces and nano-objects.

The theme of this thesis is the induced light emission in STM experiments on wide band gap semiconductors. The results were obtained on the SiC(0001)3x3 silicon carbide (SiC) surface and are divided into three parts.

The first part considers the light emission from the metal/vacuum/SiC(0001)3x3 junction of the STM. This study, associated with tunnelling spectroscopy measurements, provided a deep insight into the mechanisms and properties of electronic transport along the SiC surface states.

The second part deals with the adsorption of individual organic molecules on SiC(0001)3x3. Organic functionalization is a necessary step not only for the study of single molecule fluorescence with the STM but also for the conception of organic/inorganic hybrid materials. The submolecular STM resolution and DFT calculations carried out in collaboration enabled a detailed understanding of the adsorption configuration of phthalocyanine molecules and give some general characteristics of molecules susceptible to anchor on this surface.

The third part is devoted to numerical simulations, based on the Green tensor technique, of the light emission from the tunnel junction. This model showed the influence of the STM tip geometry on the far-field emitted light and also the fluorescence enhancement and quenching of single molecules excited by STM.
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Contributor : Guillaume Baffou <>
Submitted on : Friday, November 23, 2007 - 12:18:34 PM
Last modification on : Wednesday, September 16, 2020 - 4:32:24 PM
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Guillaume Baffou. Luminescence induite par microscopie à effet tunnel et étude des propriétés électroniques, chimiques et optiques de la surface de carbure de silicium 6H-SiC(0001)3x3. Physique [physics]. Université Paris Sud - Paris XI, 2007. Français. ⟨tel-00190955⟩

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