Download or read book Contribution l tude des m canismes de diffusion du phosphore dans le silicium written by Gérald Chambert and published by . This book was released on 1973 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Contribution l tude des m canismes de diffusion du phosphore dans le silicium written by and published by . This book was released on 1973 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Contribution la mod lisation de la diffusion des dopants en fortes concentrations dans le silicium written by Eric Vandenbossche and published by . This book was released on 1994 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les phenomenes de diffusion des dopants dans le silicium ont une importance grandissante dans les technologies actuelles et futures. En effet, les budgets thermiques diminuent avec les dimensions des dispositifs, et des phenomenes de diffusion transitoire apparaissent lors de la fabrication de jonctions ultra-courtes p#+/n et n#+/p. Ce memoire traite essentiellement des mecanismes de diffusion, bases sur les reactions entre dopants et defauts ponctuels, lesquels sont les interstitiels (atomes de silicium en site interstitiel) et les lacunes (site substitutionnel vacant). La sursaturation des defauts ponctuels, generee au cours des etapes technologiques (bombardements ioniques, oxydations, nitrurations), gouverne la diffusion transitoire des dopants. Un modele general de diffusion des dopants, incluant l'ensemble des mecanismes entre dopants et defauts ponctuels en non-equilibre, constitue la base de cette etude. Ce modele est presente en detail pour l'arsenic, le phosphore et le bore. Trois applications sur la diffusion du bore et du phosphore sont presentees montrant clairement la contribution des defauts ponctuels a la diffusion transitoire de ces dopants observee experimentalement. L'originalite de ce manuscrit consiste en l'etude des phenomenes de diffusion en fortes concentrations, plus precisement appliquee au bore et dans des conditions de preamorphisation. En effet, le bore presente des phenomenes de diffusion anormaux beaucoup plus marques par rapport aux autres dopants. Trois axes d'etudes constituent le traitement presente dans ce memoire: a) modelisation des conditions initiales pour la simulation en terme de concentrations des defauts ponctuels et activation du profil de dopage implante, b) modelisation des effets des boucles de dislocations generees par les etapes d'amorphisation, ces dislocations jouent le role de puit pour les interstitiels, et c) modelisation de la precipitation du bore, par le phenomene de nucleation derive pour la premiere fois dans un modele general de diffusion.

Download or read book DIFFUSION THERMIQUE RAPIDE DE DOPANTS DANS LE SILICIUM MONOCRISTALLIN A PARTIR DE SILICES DOPEES written by ABDELAZIZ.. LACHIQ and published by . This book was released on 1998 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: NOUS AVONS RESUME DANS CE TRAVAIL LES PRINCIPAUX MODELES DE DIFFUSION QUI PERMETTENT DE COMPRENDRE LES MECANISMES DE DIFFUSION DU PHOSPHORE DANS LE SILICIUM A PARTIR DE SILICES DOPEE. LE SIMPLE MODELE DE FERMI OU CELUI DE FAIR NE PERMETTENT PAS DE DECRIRE LA CINETIQUE DE DIFFUSION DU PHOSPHORE DANS LE SILICIUM. LE COUPLAGE COMPLET ENTRE LES LACUNES, LES INTERSTITIELLES ET LES IMPURETES CONSTITUENT UN MODELE PLUS GENERAL, PRENANT EN COMPTE LA RECOMBINAISON DES DEFAUTS PONCTUELS. NOUS AVONS SIMULE LA DIFFUSION DU PHOSPHORE A PARTIR DE SOURCES SOD (SPIN-ON DOPANT) DANS LE FOUR CONVENTIONNEL A L'AIDE DU MODELE A COUPLAGE COMPLET, CE DERNIER APPROCHE CORRECTEMENT LES PROFILS EXPERIMENTAUX. CEPENDANT LA SIMULATION DE CETTE MEME DIFFUSION DANS LE CAS DU FOUR A LAMPES, MONTRE QUE LE MODELE A COUPLAGE COMPLET AVEC SES EQUATIONS DE DIFFUSION EN EQUILIBRE EST INCAPABLE D'INTERPRETER LA DIFFUSION RAPIDE DU PHOSPHORE DANS LE SILICIUM. NOUS AVONS PAR AILLEURS BIEN APPROCHE LA REDIFFUSION DU PHOSPHORE DANS LE SILICIUM PAR RECUIT DANS LE FOUR A LAMPES A L'AIDE DE CE MODELE. NOUS EN AVONS CONCLU QUE L'INVALIDITE DE CE MODELE POUR LA DIFFUSION THERMIQUE RAPIDE DU PHOSPHORE A PARTIR DE FILMS SOD DANS LE SILICIUM EST D'ORIGINE DES EFFETS TRANSITOIRES DE LA CINETIQUE DE DIFFUSION. NOUS AVONS SUGGERE QUE PLUS PARTICULIEREMENT LA REACTION PERMETTANT L'INJECTION DE PHOSPHORE INTERSTITIEL EST HORS EQUILIBRE ET PERMET D'INJECTER DE GRANDES QUANTITES DE PHOSPHORE INTERSTITIELS DANS LE SILICIUM CE QUI EXPLIQUERAIT L'ACCELERATION DE LA CINETIQUE DE DIFFUSION THERMIQUE RAPIDE DU PHOSPHORE. NOUS AVONS UTILISE LES SOURCES SOD DE DOPANTS ET LA DIFFUSION DANS LE FOUR A LAMPES POUR REALISER DES CELLULES SOLAIRES EN UN SEUL CYCLE THERMIQUE DE DUREES INFERIEURES A UNE MINUTE. L'EMETTEUR, SA PASSIVATION PAR LE FILM D'OXYDE RESIDUEL AINSI QUE LE CHAMP ARRIERE ONT AINSI ETE FORMES SIMULTANEMENT. LE RENDEMENT ATTEINT EST DE L'ORDRE DE 12.8% SANS CHAMP ARRIERE ET DE 14% AVEC CE DERNIER.

Download or read book Etude des d faults de structure cr es par la diffusion du phosphore dans le silicium written by Patrick Mortini and published by . This book was released on 1973 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book tude de d fauts de structure cr s par la diffusion du phosphore dans le silicium written by Patrick Mortini and published by . This book was released on 1973 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Boletim written by Instituto de Energia Atômica (Brazil). Biblioteca and published by . This book was released on 1977 with total page 730 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Le Golfe Du Saint Laurent petit Oc an Ou Grand Estuaire written by Canada. Department of Fisheries and Oceans and published by Peches Et Oceans Direction Generale Des Communications = Fisheries and Oceans Communications Dir. This book was released on 1991 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of a workshop, the scientific reviews and the contributed papers presented at the symposium. The document presents a brief historical summary of marine research in the Gulf; reports the discussions, conclusions and recommendations of the different working groups on oceanography (physics, biology, chemistry and sedimentology) and on the fishery (fish and invertebrates); then presents the discussions of each multidisciplinary working group, centered around how the St. Lawrence system may be used as a natural laboratory which will contribute to the solution of major long-term problems of conservation of natural resources and of the quality of the environment.

Download or read book Cropping Systems Land Tenure and Social Diversity in Wenchi Ghana written by Samuel Adjei-Nsiah and published by . This book was released on 2006 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: However, there is still considerable scope for further development of these self-organised innovations.

Download or read book Silica in Sediments written by Hubert Andrew Ireland and published by . This book was released on 1959 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Geology of Sedimentary Phosphates written by Maurice Slansky and published by . This book was released on 1986 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Optical Properties Of Graphene written by Rolf Binder and published by World Scientific. This book was released on 2016-11-11 with total page 517 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive state-of-the-art overview of the optical properties of graphene. During the past decade, graphene, the most ideal and thinnest of all two-dimensional materials, has become one of the most widely studied materials. Its unique properties hold great promise to revolutionize many electronic, optical and opto-electronic devices. The book contains an introductory tutorial and 13 chapters written by experts in areas ranging from fundamental quantum mechanical properties to opto-electronic device applications of graphene.

Download or read book Ecosystem Function in Heterogeneous Landscapes written by Gary M. Lovett and published by Springer Science & Business Media. This book was released on 2005-12-15 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: This groundbreaking work connects the knowledge of system function developed in ecosystem ecology with landscape ecology's knowledge of spatial structure. The book elucidates the challenges faced by ecosystem scientists working in spatially heterogeneous systems, relevant conceptual approaches used in other disciplines and in different ecosystem types, and the importance of spatial heterogeneity in conservation resource management.

Download or read book Phosphate Deposits of the World Volume 2 Phosphate Rock Resources written by A. J. G. Notholt and published by Cambridge University Press. This book was released on 2005-06-30 with total page 604 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of four volumes which provides a good understanding of the mode of occurrence, geological setting and phosphogenesis of the world's phosphate resources.

Download or read book Crop Production and Global Environmental Issues written by Khalid Rehman Hakeem and published by Springer. This book was released on 2015-12-08 with total page 604 pages. Available in PDF, EPUB and Kindle. Book excerpt: Meeting the world’s food security challenge will require a multi-national, collaborative effort to integrate the best research from science, engineering and socioeconomics so that technological advances can bring benefits where they are most needed. The present book covers the effect of major environmental problems on crop production and how to cope with these issues for sustainable agriculture and improvements of crops. The world’s population is predicted to hit 9.6 Billion by 2050, up from today’s total of nearly 7.3 Billion, and with it food demand is predicted to increase substantially. The post-war ‘second agricultural revolution’ in developed countries, and the ‘green revolution’ in developing nations in the mid- 1960s converted agricultural practices and elevated crop yields spectacularly, but the outcome is levelling off and will not meet projected demand. Simultaneously, crop production is affected by many other factors, including industrial pollution, overuse of fertilizers and insecticides, heavy metal and radiation stresses etc. It has been noted that many pests are becoming resistant to insecticides. Estimates vary, but around 25% of crops can be lost to pests and diseases. Climate change associated with agriculture is also a global issue. Agriculture is a significant contributor to greenhouse gases and is estimated to account for 10-12% of total greenhouse gas (GHG) emissions. Many of the issues highlighted are global problems and are addressed thoroug hly in this work.

Download or read book A New Geography of Ghana written by Kwamina B. Dickson and published by Longman Publishing Group. This book was released on 1988 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Revised edition of A New Geography of Ghana is written specially for the WAEC O' Level syllabus and provides full coverage of Section A of Paper 2.

Download or read book Jinsha site written by 成都金沙遗址博物馆 and published by 中信出版社. This book was released on 2006 with total page 111 pages. Available in PDF, EPUB and Kindle. Book excerpt: