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Author: Slim Elleuch
Publisher: Univ Europeenne
ISBN: 9783841615503
Category :
Languages : fr
Pages : 104
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Book Description
Les materiaux organiques-inorganiques suscitent actuellement l'interet de nombreux laboratoires dans le monde de part leur interet technologique. Plusieurs travaux recents ont permis l'utilisation de ces materiaux dans le domaine de la photonique et de l'optoelectronique. Cet interet reside dans la forte luminescence excitonique observee a temperature ambiante. Ce manuscrit constitue une contribution a l'etude des semi-conducteurs hybrides photoluminescents presentant des originalites dans leurs structures. Nous avons synthetise deux nouveaux materiaux a base d'iodure de plomb. Le premier materiau, C6NPbI3, presente une structure unidimensionnelle formee de chaines inorganiques infinies separees par des chaines organiques contenant un alkylimminium (amine primaire). Le second materiau C5Pb2I5 est bidimensionnel dont la structure est formee de bicouches inorganiques d'octaedres PbI6 qui mettent leurs quatre cotes en commun au sein d'une meme couche. Le coeur de notre travail est l'etude des proprietes optiques de ces nouveaux materiaux. Pour se faire, nous avons utilise des techniques experimentales telles que l'absorption optique, la photoluminescence et la reflexion diffuse.
Author: Slim Elleuch
Publisher: Univ Europeenne
ISBN: 9783841615503
Category :
Languages : fr
Pages : 104
Get Book Here
Book Description
Les materiaux organiques-inorganiques suscitent actuellement l'interet de nombreux laboratoires dans le monde de part leur interet technologique. Plusieurs travaux recents ont permis l'utilisation de ces materiaux dans le domaine de la photonique et de l'optoelectronique. Cet interet reside dans la forte luminescence excitonique observee a temperature ambiante. Ce manuscrit constitue une contribution a l'etude des semi-conducteurs hybrides photoluminescents presentant des originalites dans leurs structures. Nous avons synthetise deux nouveaux materiaux a base d'iodure de plomb. Le premier materiau, C6NPbI3, presente une structure unidimensionnelle formee de chaines inorganiques infinies separees par des chaines organiques contenant un alkylimminium (amine primaire). Le second materiau C5Pb2I5 est bidimensionnel dont la structure est formee de bicouches inorganiques d'octaedres PbI6 qui mettent leurs quatre cotes en commun au sein d'une meme couche. Le coeur de notre travail est l'etude des proprietes optiques de ces nouveaux materiaux. Pour se faire, nous avons utilise des techniques experimentales telles que l'absorption optique, la photoluminescence et la reflexion diffuse.
Author: Tewfik Baghdadli
Publisher:
ISBN:
Category :
Languages : en
Pages : 24
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Book Description
This thesis work concerns the electrical and optical characterization of new III-N nitride alloys for optoelectronics and the optimization of ohmic and Schottky contacts on these materials. The first part of this thesis was related to the realization of metallic contacts, particularly difficult for these high bandgap materials, by the optimization of the surface treatment, multi-layer metallization and thermal annealing. We developed annealing processes at relatively low temperature (between 200°C and 500°C) and studied the effect of the chemical treatment and annealing in order to find the optimal conditions for ohmic contacts. We obtained for instance Ti/Al contacts with an excellent ohmicity and used Pt to process Schottky functional diodes. The second part of this thesis was related to the study of the electronic and structural properties of the new BGaN alloy grown by MOVPE in our laboratory. The electric characterization showed for the first time a dramatic increase in the resistivity associated to the decrease of the free carriers’ concentration when the composition of boron in BGaN increases. The variation of the resistivity in BGaN with respect to the temperature was analyzed by using a theoretical model which takes into account the free carriers’ interaction with impurities and phonons and the variation of resistivity with boron in BGaN was discussed in this framework and linked to a compensation phenomenon of the residual dopants. On the other hand a very interesting correlation was carried out between Raman and electrical results through the phonon-plasmon coupling
Author: Alessandra Sergent
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0
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Book Description
Ce travail de thèse porte sur la synthèse et la caractérisation physico-chimique de métallopolymères conjugués des éléments f en but d'utiliser ces matériaux comme composants actifs de diodes électroluminescentes. En effet, les ions lanthanides possèdent des propriétés d'émission intéressantes dans le cadre de nos applications. La chaine polymère permet quant à elle l'introduction de groupements transporteurs de charges. Ces matériaux devraient donc réunir les caractéristiques requises (transport des charges et émission) pour être utilisés dans des PLEDs (Polymer Light-Emitting Diodes), lesquelles emploient pour leur fabrication des techniques de dépôts en solution. Les PLEDs présentent l'intérêt d'avoir une structure simplifiée par rapport aux OLEDs (Organic Light-Emitting Diodes) qui sont construites par juxtaposition de couches successives de petites molécules évaporées sous vide.La synthèse de trois séries de polymères conjugués a été réalisée. La réaction de polymérisation utilisée s'effectue selon un couplage de Suzuki-Miyaura entre des motifs fluorènes et des monomères porteurs de groupements carbazoles et/ou benzimidazoles permettant de coordiner l'ion lanthanide. Plusieurs métallopolymères ont également été isolés. Les composés synthétisés ont été caractérisés par analyse élémentaire, RMN et chromatographie par exclusion stérique. Des études de photoluminescence sur ces composés en présence ou non d'ions lanthanides luminescents ont été effectuées. Enfin, les polymères et métallopolymères ont été utilisés dans la conception de diodes électroluminescentes.
Author: Aymen Yangui
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0
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Book Description
Les matériaux hybrides organiques inorganiques ont attirés l'attention vue qu'ils présentent des propriétés optiques et optoélectroniques fascinantes comme la forte photoluminescence même à température ambiante. Cet axe de recherche relativement nouveau, sur cette famille de matériaux, offre une variété d'opportunités technologiques. Dans ce contexte, nous nous sommes intéressés par l'étude des propriétés optiques des deux matériaux hybrides organiques inorganiques (C6H11NH3)2[PbI4] et (C6H11NH3)2[PbBr4], et principalement leurs propriétés de luminescence. Les résultats montre que sous excitation dans l'ultraviolet, (C6H11NH3)2[PbBr4] émet de la lumière blanche, même à température ambiante, ce qui présente un grand intérêt de l'utilisation de ces matériaux comme source d'émission de la lumière blanche. L'origine de cette émission a été étudié par différentes techniques comme la photoluminescence résolution en temps.
Author: Ahmed Belasri
Publisher: Springer Nature
ISBN: 9811554447
Category : Technology & Engineering
Languages : en
Pages : 659
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Book Description
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.
Author:
Publisher:
ISBN:
Category : Physics
Languages : en
Pages : 772
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Book Description
Author: Vincent Laude
Publisher: Walter de Gruyter GmbH & Co KG
ISBN: 3110387913
Category : Science
Languages : en
Pages : 494
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Book Description
Phononic crystals are artificial periodic structures that can alter efficiently the flow of sound, acoustic waves, or elastic waves. They were introduced about twenty years ago and have gained increasing interest since then, both because of their amazing physical properties and because of their potential applications. The topic of phononic crystals stands as the cross-road of physics (condensed matter physics, wave propagation in inhomogeneous and periodic media) and engineering (acoustics, ultrasonics, mechanical engineering, electrical engineering). Phononic crystals cover a wide range of scales, from meter-size periodic structures for sound in air to nanometer-size structures for information processing or thermal phonon control in integrated circuits. Phononic crystals have a definite relation with the topic of photonic crystals in optics. The marriage of phononic and photonic crystals also provides a promising structural basis for enhanced sound and light interaction. As the topic is getting popular, it is nowadays presented and discussed at various international conferences. After the first ten years during which the topic has remained mainly theoretical with a few proof-of-concept demonstrations in the literature, the evolution has been towards applications, instrumentation, and novel designs. The physical explanations for various effects are now well understood and efficient numerical methods and analysis tools have been developed. The book contains a comprehensive set of finite element model (FEM) scripts for solving basic phononic crystal problems. The scripts are short, easy to read, and efficient, allowing the reader to generate for him(her)self band structures for 2D and 3D phononic crystals, to compute Bloch waves, waveguide and cavity modes, and more.
Author: Sébastien Forget
Publisher: Springer
ISBN: 3642367054
Category : Science
Languages : en
Pages : 179
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Book Description
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.
Author: Zhe Chuan Feng
Publisher: World Scientific
ISBN: 1848162235
Category : Technology & Engineering
Languages : en
Pages : 477
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Book Description
Devices, nanoscale science and technologies based on GaN and related materials, have achieved great developments in recent years. New GaN-based devices such as UV detectors, fast p-HEMT and microwave devices are developed far more superior than other semiconductor materials-based devices.Written by renowned experts, the review chapters in this book cover the most important topics and achievements in recent years, discuss progress made by different groups, and suggest future directions. Each chapter also describes the basis of theory and experiment.This book is an invaluable resource for device design and processing engineers, material growers and evaluators, postgraduates and scientists as well as newcomers in the GaN field.
Author: Jean Daillant
Publisher: Springer Science & Business Media
ISBN: 3540486968
Category : Science
Languages : en
Pages : 347
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Book Description
The reflection of and neutrons from surfaces has existed as an x-rays exp- imental for almost it is in the last technique fifty Nevertheless, only years. decade that these methods have become as of enormously popular probes This the surfaces and interfaces. to be due to of several appears convergence of intense different circumstances. These include the more n- availability be measured orders tron and sources that can over (so reflectivity x-ray many of and the much weaker surface diffuse can now also be magnitude scattering of thin films and studied in some the detail); growing importance multil- basic the realization of the ers in both and technology research; important which in the of surfaces and and role roughness plays properties interfaces; the of statistical models to characterize the of finally development topology its and its characterization from on roughness, dependence growth processes The of and to surface scattering experiments. ability x-rays neutro4s study four five orders of in scale of surfaces over to magnitude length regardless their and also their to ability probe environment, temperature, pressure, etc. , makes these the choice for buried interfaces often probes preferred obtaining information about the microstructure of often in statistical a global surfaces, the local This is manner to complementary imaging microscopy techniques, of such studies in the literature witnessed the veritable by explosion published the last few Thus these lectures will useful for over a resource years.
