Download Free Nouveaux Composants Electroniques A Base Du Materiau Aln Pour Les Futures Applications De Puissance Book in PDF and EPUB Free Download. You can read online Nouveaux Composants Electroniques A Base Du Materiau Aln Pour Les Futures Applications De Puissance and write the review.

Les semiconducteurs à large bande interdite tels que le GaN et SiC sont des matériaux de choix pour les applications de forte puissance. En effet, les propriétés du matériau GaN, notamment la haute densité et mobilité des électrons du gaz bidimensionnel des hétérostructures associées permettent de réaliser un excellent compromis entre la résistance à l'état passant (Ron) et la tension de claquage. De plus, les récents progrès en matière de croissance de GaN sur substrat silicium (111) laissent espérer l'intégration future de composants de forte puissance à bas coût avec des technologies matures de type CMOS. Afin de repousser davantage les limites des transistors à haute mobilité électronique (HEMT) en GaN pour la conversion de puissance, l'un des défis est de repousser la tenue en tension de cette filière. Dans ce cadre, nous avons, tout d'abord, étudié électriquement les couches tampons (buffer) par décomposition de l'empilement. Plusieurs hétérostructures ont été analysées dont la croissance a été stoppée à différents stades. De cette manière, nous avons été en mesure d'évaluer séparément le processus de conduction et de claquage de la couche de nucléation d'AlN, du buffer AlGaN et de l'empilement des couches jusqu'à une couche GaN dopée carbone. Une seconde étude a permis de développer un buffer à base de super-réseaux (pairs AlN/GaN ultrafins). Afin de mettre en évidence les avantages obtenus avec ce type de buffer une comparaison des caractérisations électriques avec un buffer standard a été réalisée.Ensuite, nous avons développé une approche innovante basée sur l'introduction d'une couche épaisse d'AlN au sein de tranches gravées suivie d'un dépôt par électrolyse de cuivre épais en face arrière. Le matériau AlN constitue une barrière de potentiel après le dépôt de l'électrode métallique sur la face-arrière, étape indispensable dans les convertisseurs de puissance de type DC/DC par exemple. Après avoir vérifié le bénéfice de cette solution en terme de tension de claquage, nous avons analysé son impact sur les pièges et les contraintes mécaniques.Enfin, partant du principe que l'électronique à base de matériaux à grands gaps tels que le GaN et le SiC arrivent à maturité, les matériaux à ultra large bande interdite tels que l'AlN (6,2 eV) ou l'AlGaN riche en Al, pourraient permettre de repousser les limites en tension ou en température. En outre, l'utilisation d'un buffer AlN permettrait à la fois d'augmenter le confinement des électrons dans le canal du transistor mais aussi d'améliorer la dissipation thermique. Nous avons donc mené une étude préliminaire sur différentes configurations de transistors à base d'AlN et de canaux en AlGaN.
Earthen architecture constitutes one of the most diverse forms of cultural heritage and one of the most challenging to preserve. It dates from all periods and is found on all continents but is particularly prevalent in Africa, where it has been a building tradition for centuries. Sites range from ancestral cities in Mali to the palaces of Abomey in Benin, from monuments and mosques in Iran and Buddhist temples on the Silk Road to Spanish missions in California. This volume's sixty-four papers address such themes as earthen architecture in Mali, the conservation of living sites, local knowledge systems and intangible aspects, seismic and other natural forces, the conservation and management of archaeological sites, research advances, and training.
This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.
An up-to-date, practical guide on upgrading from silicon to GaN, and how to use GaN transistors in power conversion systems design This updated, third edition of a popular book on GaN transistors for efficient power conversion has been substantially expanded to keep students and practicing power conversion engineers ahead of the learning curve in GaN technology advancements. Acknowledging that GaN transistors are not one-to-one replacements for the current MOSFET technology, this book serves as a practical guide for understanding basic GaN transistor construction, characteristics, and applications. Included are discussions on the fundamental physics of these power semiconductors, layout, and other circuit design considerations, as well as specific application examples demonstrating design techniques when employing GaN devices. GaN Transistors for Efficient Power Conversion, 3rd Edition brings key updates to the chapters of Driving GaN Transistors; Modeling, Simulation, and Measurement of GaN Transistors; DC-DC Power Conversion; Envelope Tracking; and Highly Resonant Wireless Energy Transfer. It also offers new chapters on Thermal Management, Multilevel Converters, and Lidar, and revises many others throughout. Written by leaders in the power semiconductor field and industry pioneers in GaN power transistor technology and applications Updated with 35% new material, including three new chapters on Thermal Management, Multilevel Converters, Wireless Power, and Lidar Features practical guidance on formulating specific circuit designs when constructing power conversion systems using GaN transistors A valuable resource for professional engineers, systems designers, and electrical engineering students who need to fully understand the state-of-the-art GaN Transistors for Efficient Power Conversion, 3rd Edition is an essential learning tool and reference guide that enables power conversion engineers to design energy-efficient, smaller, and more cost-effective products using GaN transistors.
Organic lasers are broadly tunable coherent sources, potentially compact, convenient and manufactured at low-costs. Appeared in the mid 60’s as solid-state alternatives for liquid dye lasers, they recently gained a new dimension after the demonstration of organic semiconductor lasers in the 90's. More recently, new perspectives appeared at the nanoscale, with organic polariton and surface plasmon lasers. After a brief reminder to laser physics, a first chapter exposes what makes organic solid-state organic lasers specific. The laser architectures used in organic lasers are then reviewed, with a state-of-the-art review of the performances of devices with regard to output power, threshold, lifetime, beam quality etc. A survey of the recent trends in the field is given, highlighting the latest developments with a special focus on the challenges remaining for achieving direct electrical pumping of organic semiconductor lasers. A last chapter covers the applications of organic solid-state lasers.
Power Electronics Device Applications of Diamond Semiconductors presents state-of-the-art research on diamond growth, doping, device processing, theoretical modeling and device performance. The book begins with a comprehensive and close examination of diamond crystal growth from the vapor phase for epitaxial diamond and wafer preparation. It looks at single crystal vapor deposition (CVD) growth sectors and defect control, ultra high purity SC-CVD, SC diamond wafer CVD, heteroepitaxy on Ir/MqO and needle-induced large area growth, also discussing the latest doping and semiconductor characterization methods, fundamental material properties and device physics. The book concludes with a discussion of circuits and applications, featuring the switching behavior of diamond devices and applications, high frequency and high temperature operation, and potential applications of diamond semiconductors for high voltage devices. - Includes contributions from today's most respected researchers who present the latest results for diamond growth, doping, device fabrication, theoretical modeling and device performance - Examines why diamond semiconductors could lead to superior power electronics - Discusses the main challenges to device realization and the best opportunities for the next generation of power electronics