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Étude des propriétés physiques de nanofils individuels de carbure de silicium par émission de champ

Abstract : We use field emission (FE) from individual silicon carbide nanowires (NWs) to explore their potential as electron sources, and especially as a versatile tool for studying transport, optical and mechanical properties of NWs. These studies fall within the larger framework of the physics of semiconducting (SC) nanowires, which is presently a large and rapidly expanding domain. The important role played by the surface in the transport and optical properties of NWs was clearly demonstrated by the radical consequences induced by in situ treatments on the FE properties. This permitted the observation of the specific behavior expected for SCs, particularly, a current saturation regime in agreement with the theory of FE for SCs. We found that the saturation was concomitant with a strong dependence of the emission on temperature and laser illumination, revealed for the first time for a NF. These measurements open important perspectives for both fundamental research and applications such as the realization of optically or thermally controlled FE electron sources. The current-voltage-temperature characteristics were carried out in parallel with measurement of the energy distributions of the emitted electrons, thus permitting the determination of the transport mechanism in the NWs. We found that the transport was limited by the carrier density in the volume and by the traps in the gap that generate current through the Poole-Frenkel effect. Finally, the mechanical characterization revealed high quality factors, as high as 160,000, and a Young’s modulus up to 700 GPa. These values are very promising for the use of these NWs in nano-electro-mechanical systems (NEMS) and composites.
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May Choueib. Étude des propriétés physiques de nanofils individuels de carbure de silicium par émission de champ. Autre [cond-mat.other]. Université Claude Bernard - Lyon I, 2009. Français. ⟨NNT : 2009LYO10119⟩. ⟨tel-00656991⟩

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