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PHYSIQUE DES TRANSITIONS INTERSOUSBANDES DES HETEROSTRUCTURES DE GAN / ALN POUR L'OPTOELECTRONIQUE À LAMBDA = 1,3 - 1,55 MICRON

Abstract : Intersubband transitions in semiconductor heterostructures have been intensively studied since the early 80s. Today there are still two frontiers to be explored: extending the intersubband devices to the long wavelengths of THz domain and to fiber optics telecommunication wavelengths. To reach the1.3 - 1.55 micron domain, one should use semiconductor heterostructures with large band discontinuity. GaN/AlN heterostructures, studied in this work, have large conduction band offset (<1.75 eV) and therefore are very promising candidates for the development of unipolar optoelectronic devices operating at 1.3-1.55 micron.
This work is focused on the experimental and theoretical study of the intersubband transitions in GaN/AlN quantum wells and quantum dots grown by molecular beam epitaxy on sapphire (0001) substrate. Firstly, I show the results of optical and structural characterizations of the quantum well samples and also the modeling of the quantum confinement in these heterostructures. The influence of doping is discussed. Then I focus on the study of coupling between two quantum wells separated by an ultra-thin barrier and on the application of these system to electro-optical modulators and quantum fountain lasers. Finally, I present the results on the intraband absorption of GaN/AlN quantum dots at telecommunication wavelengths and I discuss first applications to infrared photodetection.
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https://tel.archives-ouvertes.fr/tel-00011347
Contributor : Maria Tchernycheva <>
Submitted on : Wednesday, January 11, 2006 - 2:14:14 PM
Last modification on : Wednesday, September 16, 2020 - 4:56:01 PM
Long-term archiving on: : Saturday, April 3, 2010 - 7:30:01 PM

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  • HAL Id : tel-00011347, version 1

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Maria Tchernycheva. PHYSIQUE DES TRANSITIONS INTERSOUSBANDES DES HETEROSTRUCTURES DE GAN / ALN POUR L'OPTOELECTRONIQUE À LAMBDA = 1,3 - 1,55 MICRON. Physique [physics]. Université Paris Sud - Paris XI, 2005. Français. ⟨tel-00011347⟩

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