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COUPLAGE LUMIERE-MATIERE AU SEIN DE DETECTEURS INFRAROUGES A BASE DE NANOCRISTAUX COLLOIDAUX

Abstract : Colloidal nanocrystals are nanoparticles grown in solution. When their dimension is reduced below the Bohr radius, quantum confinement appears: optical properties depend on the size of the crystal. These nanocrystals are currently used for their visible emission properties but can also be applied for infrared photodetection. Mercury and lead chalcogenide (and in particular HgTe and PbS) absorb in the infrared. The hopping transport associated with nanocrystal array induced the use of thin film. The absorption of such film remains low and so does their performance. My work consists in induce light-matter coupling within a nanocrystal array in order to boost the absorption and the responsivity. Using nanostructured electrodes, it is possible to induce guided mode resonances within nanocrystal thin films. The responsivity of such devices presents an increase of a factor 102 – 103 compared to a film on conventional electrodes due to an enlargement of the absorption and the photoconductive gain both. This method is versatile and can be used for different materials, at different wavelengths and for different device geometries. In a last part, I will show a device that improve transport properties in a nanocrystal film. This device has a detectivity of 1012 Jones at 2.5 µm, 1 V and 200 K, which is comparable with commercial detectors.
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https://hal.archives-ouvertes.fr/tel-03284392
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Submitted on : Monday, July 12, 2021 - 3:27:23 PM
Last modification on : Monday, October 11, 2021 - 3:16:48 AM
Long-term archiving on: : Wednesday, October 13, 2021 - 7:18:15 PM

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  • HAL Id : tel-03284392, version 1

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Audrey Chu. COUPLAGE LUMIERE-MATIERE AU SEIN DE DETECTEURS INFRAROUGES A BASE DE NANOCRISTAUX COLLOIDAUX. Matériaux. Sorbonne Université, 2021. Français. ⟨tel-03284392⟩

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