Etude Par Photoemission Des Surfaces 111 Et 110 Imparfaites De Silicium

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ETUDE PAR PHOTOEMISSION DES SURFACES (111) ET (110) IMPARFAITES DE SILICIUM

Author : NABIL.. SAFTA
Publisher :
ISBN 13 :
Total Pages : 217 pages
Book Rating : 4.:/5 (78 download)

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Book Synopsis ETUDE PAR PHOTOEMISSION DES SURFACES (111) ET (110) IMPARFAITES DE SILICIUM by : NABIL.. SAFTA

Download or read book ETUDE PAR PHOTOEMISSION DES SURFACES (111) ET (110) IMPARFAITES DE SILICIUM written by NABIL.. SAFTA and published by . This book was released on 1994 with total page 217 pages. Available in PDF, EPUB and Kindle. Book excerpt: LE SUJET DE CETTE THESE EST L'ETUDE DES PROPRIETES MORPHOLOGIQUES ET ELECTRONIQUES DES DIFFERENTS SURFACES DE SILICIUM AFIN DE MIEUX CORRELER LES PARTICULARITES D'UNE STRUCTURE SUPERFICIELLE AUSSI BIEN IDENTIFIEE QUE POSSIBLE, MEME SI ELLE EST DEFFECTUEUSE, AVEC SES PROPRIETES ELECTRONIQUES, Y COMPRIS DE DIFFUSION DES ELECTRONS DANS LE PROCESSUS DE PHOTOEMISSION. LES TECHNIQUES UTILISEES SONT LA SPECTROSCOPIE DE RENDEMENT DE PHOTOEMISSION, LA SPECTROSCOPIE DE PHOTOEMISSION RESOLUE ANGULAIREMENT DANS L'ULTRAVIOLET, LA DIFFRACTION D'ELECTRONS LENTS ET LA SPECTROMETRIE AUGER. DANS UNE PREMIERE PARTIE, UNE ETUDE DETAILLEE A ETE FAITE EN VUE D'ANALYSER LES DIFFERENTS MECANISMES DE DIFFUSION DE SURFACE SUSCEPTIBLES D'AFFECTER LE PROCESSUS DE PHOTOEMISSION. EN SE BASANT SUR LES PREVISIONS THEORIQUES DE KANE, NOUS AVONS MONTRE QUE LE PROCESSUS DE PHOTOEMISSION DEPEND DU TYPE DES TRANSITIONS ELECTRONIQUES (DIRECTES OU INDIRECTES) ET DE LA NATURE ET LA GEOMETRIE DES DEFAUTS. CETTE ETUDE A REVELE QUE L'HYPOTHESE DE CONSERVATION DE LA COMPOSANTE PARALLELE DU MOMENT DE L'ELECTRON AU FRANCHISSEMENT DE LA SURFACE EST RAREMENT VALABLE. DANS LA DEUXIEME PARTIE CONSACREE A LA FACE (110) DU SILICIUM, NOUS AVONS MONTRE QUE CETTE SURFACE NOMINALE PRESENTE UNE RECONSTRUCTION 16X2 A DEUX DOMAINES, QU'ELLE A UNE BANDE D'ETATS DE SURFACE OCCUPES LARGE COMME LA SI(111)7X7. ELLE IMPLIQUE DONC PLUSIEURS PLANS ATOMIQUES. NOUS AVONS, AUSSI, ETUDIE UNE SURFACE (110) VICINALE OBTENUE EN DESORIENTANT LE PLAN DE LA SURFACE DE 422' DANS UNE DIRECTION DE LA FAMILLE111. CETTE SURFACE S'EST AVERE MONODOMAINE, ORDONNEE ET EST RECONSTRUITE 8X2. SA STRUCTURE LOCALE EST FAITE DE PLUSIEURS CONFIGURATIONS COMME DES ADATOMES OU DES DIMERES PLUS OU MOINS DEFORMEES GEOMETRIQUEMENT. LE DERNIER CHAPITRE A CONCERNE L'ETUDE DES INTERACTIONS DES SURFACES SI(110) AVEC L'HYDROGENE ATOMIQUE, L'INDIUM ET L'OXYGENE. NOUS AVONS D'ABORD REUSSI A PASSIVER LES SURFACES SI(110) PAR HYDROGENATION A CHAUD. LE RENDEMENT DE PHOTOEMISSION CONFIRME LE CARACTERE DIFFUSANT DE CETTE SURFACE. L'ETUDE DE L'INTERFACE SI(110)/IN A 500C A MONTRE QUE NOUS OBTENONS UNE RECONSTRUCTION 5X2 POUR DES RECOUVREMENTS SITUES ENTRE 0.3 MC ET 2 MC

A Surface and Interface Study of CdZnTe and the Behaviors of Si Surface

Author : Xuxu Bai
Publisher :
ISBN 13 :
Total Pages : 116 pages
Book Rating : 4.:/5 (8 download)

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Book Synopsis A Surface and Interface Study of CdZnTe and the Behaviors of Si Surface by : Xuxu Bai

Download or read book A Surface and Interface Study of CdZnTe and the Behaviors of Si Surface written by Xuxu Bai and published by . This book was released on 2011 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: La spectroscopie de photoémission utilisant le rayonnement synchrotron (Synchrotron Radiation Photoemission Spectroscopy, SRPES) a été utilisée pour étudier les caracéristiques de la surface de CdZnTe, telles que, la structure électronique et la dispersion de bandes, des surfaces CdZnTe(111)A, (111)B et (110). Les niveaux électroniques, la fonction de travail de la surface ont été étudiés pour comprendre l'adsorption de O2 et H2O sur les différentes surfaces de CdZnTe. En outre, de l'or et de l'aluminium ont été déposés par épitaxie par jets moléculaires (MBE) sur deux différents plans polaires de CdZnTe. Le comportement de l'interface de CdZnTe et les contacts métalliques, y compris la réaction chimique d'interface et la hauteur de barrière de Schottky (SBH) ont été étudiés en détail. Enfin, l'adsorption du chlorure d'acétyle (CH3-CClO) et de l'ammoniac (NH3) sur la surface de Si(001) ont été étudiés.

Structure électronique de la face (111) du silicium non reconstruite

Author : Saïdi Bouzidi
Publisher :
ISBN 13 :
Total Pages : 212 pages
Book Rating : 4.:/5 (49 download)

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Book Synopsis Structure électronique de la face (111) du silicium non reconstruite by : Saïdi Bouzidi

Download or read book Structure électronique de la face (111) du silicium non reconstruite written by Saïdi Bouzidi and published by . This book was released on 1993 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: CETTE THESE EST CONSACREE A L'ETUDE PAR PHOTOEMISSION INVERSE DES ETATS DE CONDUCTION DE LA FACE (111) DU SILICIUM SOUS SES DIFFERENTES FORMES: SI(111)-77 ET SI(111)-11 NON RECONSTRUITE STABILISEE PAR L'HYDROGENE OU L'ARSENIC QUI SATURENT LES LIAISONS PENDANTES. NOUS MONTRONS QUE L'INTERFACE H:SI(111)-11 NE POSSEDE PAS D'ETATS ELECTRONIQUES DE SURFACE INDUITS PAR LA PRESENCE DE L'HYDROGENE. POUR LA DIRECTION IM DE LA ZONE DE BRILLOUIN DE SURFACE, LES SPECTRES DE PHOTOEMISSION INVERSE CORRESPONDANT A 2 DIRECTIONS SYMETRIQUES DES ELECTRONS INCIDENTS PAR RAPPORT A LA NORMALE SONT TRES DISSEMBLABLES. CETTE ASYMETRIE, LIEE A LA DISPOSITION DES ATOMES DE SURFACE, CONSTITUE UNE SIGNATURE DE LA STRUCTURE 11. NOUS LA RETROUVONS DANS LE CAS DE L'INTERFACE AS:SI(111)-11 DONT L'ORGANISATION GENERALE EST SEMBLABLE. L'ELECTRONEGATIVITE DE L'ARSENIC DE PREMIERE COUCHE PROVOQUE LA DESCENTE DES ETATS ELECTRONIQUES DE SI(111)-11 DONT L'UN SE RETROUVE DANS LA BANDE INTERDITE. NOUS AVONS MIS CET ETAT EN EVIDENCE, VERIFIANT AINSI AVEC UNE GRANDE PRECISION LA THEORIE DE HYBERTSEN ET LOUIE QUI PREVOIT CET EFFET. LA DERNIERE PARTIE EST CONSACREE A L'ETUDE DU SYSTEME CAF#2/SI(111). A FAIBLE RECOUVREMENT, UNE RECONSTRUCTION 33R30 EST OBTENUE ET ANALYSEE. A PLUS FORT RECOUVREMENT (>2 TRICOUCHES), LA COUCHE DE FLUOR DE SURFACE EST DESORBEE SOUS L'ACTION DES ELECTRONS INCIDENTS, REVELANT UNE SURFACE PARFAITEMENT METALLIQUE COMPOSEE DE CA#1#+ EN LIEU ET PLACE DE LA SURFACE ISOLANTE ATTENDUE. LA DISPERSION DES ETATS DE CONDUCTION DE CETTE SURFACE EST DETERMINEE ET PRESENTEE, EN RELATION AVEC DES RESULTATS DE PHOTOEMISSION ANTERIEURS

Molecular Beam Epitaxy

Author : John Wilfred Orton
Publisher :
ISBN 13 : 0199695822
Total Pages : 529 pages
Book Rating : 4.1/5 (996 download)

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Book Synopsis Molecular Beam Epitaxy by : John Wilfred Orton

Download or read book Molecular Beam Epitaxy written by John Wilfred Orton and published by . This book was released on 2015 with total page 529 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book is a history of Molecular Beam Epitaxy (MBE) as applied to the growth of semiconductor thin films (note that it does not cover the subject of metal thin films). It begins by examining the origins of MBE, first of all looking at the nature of molecular beams and considering their application to fundamental physics, to the development of nuclear magnetic resonance and to the invention of the microwave MASER. It shows how molecular beams of silane (SiH4) were used to study the nucleation of silicon films on a silicon substrate and how such studies were extended to compound semiconductors such as GaAs. From such surface studies in ultra-high vacuum the technique developed into a method of growing high quality single crystal films of a wide range of semiconductors. Comparing this with earlier evaporation methods of deposition and with other epitaxial deposition methods such as liquid phase and vapour phase epitaxy (LPE and VPE). The text describes the development of MBE machines from the early 'home-made' variety to that of commercial equipment and show how MBE was gradually refined to produce high quality films with atomic dimensions. This was much aided by the use of various in-situ surface analysis techniques, such as reflection high energy electron diffraction (RHEED) and mass spectrometry, a feature unique to MBE. It looks at various modified versions of the basic MBE process, then proceed to describe their application to the growth of so-called 'low-dimensional structures' (LDS) based on ultra-thin heterostructure films with thickness of order a few molecular monolayers. Further chapters cover the growth of a wide range of different compounds and describe their application to fundamental physics and to the fabrication of electronic and opto-electronic devices. The authors study the historical development of all these aspects and emphasise both the (often unexpected) manner of their discovery and development and the unique features which MBE brings to the growth of extremely complex structures with monolayer accuracy.

UCRL.

Author : U.S. Atomic Energy Commission
Publisher :
ISBN 13 :
Total Pages : 26 pages
Book Rating : 4.E/5 ( download)

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Book Synopsis UCRL. by : U.S. Atomic Energy Commission

Download or read book UCRL. written by U.S. Atomic Energy Commission and published by . This book was released on 19?? with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:

An Introduction to Differential Manifolds

Author : Jacques Lafontaine
Publisher : Springer
ISBN 13 : 3319207350
Total Pages : 408 pages
Book Rating : 4.3/5 (192 download)

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Book Synopsis An Introduction to Differential Manifolds by : Jacques Lafontaine

Download or read book An Introduction to Differential Manifolds written by Jacques Lafontaine and published by Springer. This book was released on 2015-07-29 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is an introduction to differential manifolds. It gives solid preliminaries for more advanced topics: Riemannian manifolds, differential topology, Lie theory. It presupposes little background: the reader is only expected to master basic differential calculus, and a little point-set topology. The book covers the main topics of differential geometry: manifolds, tangent space, vector fields, differential forms, Lie groups, and a few more sophisticated topics such as de Rham cohomology, degree theory and the Gauss-Bonnet theorem for surfaces. Its ambition is to give solid foundations. In particular, the introduction of “abstract” notions such as manifolds or differential forms is motivated via questions and examples from mathematics or theoretical physics. More than 150 exercises, some of them easy and classical, some others more sophisticated, will help the beginner as well as the more expert reader. Solutions are provided for most of them. The book should be of interest to various readers: undergraduate and graduate students for a first contact to differential manifolds, mathematicians from other fields and physicists who wish to acquire some feeling about this beautiful theory. The original French text Introduction aux variétés différentielles has been a best-seller in its category in France for many years. Jacques Lafontaine was successively assistant Professor at Paris Diderot University and Professor at the University of Montpellier, where he is presently emeritus. His main research interests are Riemannian and pseudo-Riemannian geometry, including some aspects of mathematical relativity. Besides his personal research articles, he was involved in several textbooks and research monographs.

Aeronomy

Author : P. M. Banks
Publisher : Elsevier
ISBN 13 : 1483260666
Total Pages : 445 pages
Book Rating : 4.4/5 (832 download)

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Book Synopsis Aeronomy by : P. M. Banks

Download or read book Aeronomy written by P. M. Banks and published by Elsevier. This book was released on 2013-09-24 with total page 445 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aeronomy, Part A is an attempt to make a comprehensive exposition of the processes in aeronomy, the study of composition, movement, and thermal balance of the upper regions of the planetary atmosphere. The text covers topics such as atmospheric regions and atmospheric density, the temperature and molecular mass of the atmosphere; the permanent constituents and the molecular and isotonic composition of the homosphere; and the transition from the homosphere to the heterosphere. Also covered are topics such as the temperature gradient and energies in the thermosphere, conditions at 200km and above 250km, solar radiation and ionization, and aeronomic reactions. The book is recommended for scientists, especially natural physicists, who would like to know more about the field of aeronomy and its advances.

Minimum competence in scientific English

Author : Sue Blattes
Publisher : L'Editeur : EDP Sciences
ISBN 13 : 9782868835888
Total Pages : 264 pages
Book Rating : 4.8/5 (358 download)

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Book Synopsis Minimum competence in scientific English by : Sue Blattes

Download or read book Minimum competence in scientific English written by Sue Blattes and published by L'Editeur : EDP Sciences. This book was released on 2003 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cet ouvrage, devenu célèbre sous son sigle MCSE, a déjà été utilisé par plus de 50 000 étudiants, chercheurs, professionnels. L'objectif est de lire et écrire des textes en anglais scientifique avec facilité et pertinence. L'ouvrage est conçu pour que l'apprenant devienne un véritable utilisateur de l'anglais. La méthode originale repose sur l'analyse des fonctions et structures nécessaires : measurement, frequency, comparison, modification, link words, time, cause and consequence, hypothesis, modality, purpose and process, impersonal forms, compound nouns and adjectives. Dans chaque unit, des tests d'auto-évaluation permettent de se situer et de construire son parcours de formation, d'abord en définissant ses objectifs à l'aide des key points et du lexis, puis, de façon plus personnalisée, en puisant dans les examples in context, checkpoints (back to basics, word web), web search, FAQs... MCSE est l'outil de base d'une méthode qui comprend aussi d'autres outils dans la même collection (Listening Comprehension for Scientiflc English et Speaking Skills in Scientitic English). L'ouvrage est destiné à tout apprenant de niveau baccalauréat qui désire acquérir une réelle compétence dans l'écriture et la lecture de textes en anglais scientifique.

Popular Astronomy

Author : Camille Flammarion
Publisher :
ISBN 13 :
Total Pages : 732 pages
Book Rating : 4.A/5 ( download)

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Book Synopsis Popular Astronomy by : Camille Flammarion

Download or read book Popular Astronomy written by Camille Flammarion and published by . This book was released on 1894 with total page 732 pages. Available in PDF, EPUB and Kindle. Book excerpt: