Download or read book Propri t s optiques des couches tr s minces de cuivre microforme written by Fritz Lauriston and published by Bibliothèque nationale du Canada. This book was released on 1986 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Propri t s optiques des couches ultra minces de cuivre par la m thode RTAM microforme written by Louis B. Allard and published by Bibliothèque nationale du Canada. This book was released on 1989 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Propri t s optiques et lectrochromes des couches minces de WO 3 et de WO 3 V 2O 5 d pos s par vaporation thermique spontan e microforme written by Pierre Losier and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 2004 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Etude de la pr paration et des propri t s optiques et magn to optiques des couches tr s minces de fer written by and published by . This book was released on 1929 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Propri t s optiques et structure des couches minces m talliques written by Roger Philip and published by . This book was released on 1960 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Propri t s optiques des couches granulaires de cuivre avec rev tement d aluminum et leur utilisation comme surfaces s lectives solaires written by Savvas Damaskinos and published by . This book was released on 1982 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sur les propri t s optiques des couches minces des m taux alcalino terreux written by Robert Blanc and published by . This book was released on 19?? with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Propri t s des couches minces du syst me Cu Te R alisation et tude de photopiles utilisant les tellurures de cadmium et de cuivre written by Jacques Bernard and published by . This book was released on 1965 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Propri t s optiques des lames minces de cuivre written by Anne-Marie Duquenne and published by . This book was released on 1960 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Propri t s Optiques Des Couches Minces de Dichalcog nures de M taux de Transition written by Maciej Koperski and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The research reported in the thesis entitled 'Optical properties of thin layers of transition metal dichalcogenides' focuses on physical phenomena which emerge in the limit of two-dimensional (2D) miniaturisation when the thickness of fabricated films reaches an atomic scale. The importance of such man-made structures has been revealed by the dynamic research on graphene: a single atomic plane of carbon atoms arranged in honeycomb lattice. Graphene is intrinsically gapless and therefore mainly explored with respect to its electric properties. The investigation of semiconducting materials which can also display the hexagonal crustal structure and which can be thinned down to individual layers, bridges the concepts characteristic of graphene-like systems (K-valley physics) with more conventional properties of semiconductors. This has been indeed demonstrated in a number of recent studies of ultra-thin films of semiconducting transition metal dichalcogenides (sc-TMD). Particularly appealing, from the point of view of optical studies, is a transformation of the bandgap alignment of sc-TMD films, from the indirect bandgap bulk crystals to the direct bandgap system in single layers. The presented thesis work provides a comprehensive optical characterisation of thin structures of sc-TMD crystals. The manuscript is divided into five parts: three main chapters with a preceding introduction and the appendix reporting the supplementary studies of another layered material: hexagonal boron nitride.Introduction. The fundamental properties of the investigated crystals are presented, especially those which are important from the point of view of optical studies. The discussion includes information on the crystal structure, Brillouin zone and electronic band structure. Also, the general description of the samples' preparation process and experimental set-up is provided.Chapter 1. Basic optical characterisation of excitonic resonances in mono- and multi-layers of sc-TMDs. The optical response, as seen in the reflectance and luminescence spectra of thin sc-TMDs is analysed (mostly for MoSe2 and WSe2 materials). The impact of the number of layers and temperature on the optical resonances is studied and interpreted in details. The complementary time-resolved study is also presented.Chapter 2. Zeeman spectroscopy of excitonic resonances in magnetic fields. The evolution of the optical resonances in an external magnetic field, applied perpendicularly to the layers of sc-TMD materials is investigated. Based on these results, a phenomenological model is developed aiming to describe the linear with magnetic field contributions to the energy of individual electronic states in fundamental sub-bands of sc-TMD monolayers. Furthermore, the effects of optical pumping are investigated in WSe2 monolayers, which can be tuned by tiny magnetic fields.Chapter 3. Single photon sources in thin sc-TMD flakes. The discovery of localised narrow lines emitting centres has been in thin sc-TMD flakes is presented. An investigation of their fundamental properties is discussed. This includes the measurements of temperature and magnetic field evolution of the photoluminescence lines, and the analysis of the polarisation properties and the excitation spectra as well as photon correlation measurements.Appendix A. Single photon emitters in boron nitride crystals. Hexagonal boron nitride also belongs to the family of layered materials, but it exhibits much larger band gap than semiconducting transition metal dichalcogenides. A narrow lines emitting centres has been observed in boron nitride structures, which reveal multiple similarities to defect centres in wide gap materials. They are characterised in a similar manner as the emitting centres in WSe2.
Download or read book Etude des propri t s optiques et de l homog n it des couches minces de fer de cobalt de nickel et de palladium written by Max Belzons and published by . This book was released on 1969 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Propri t s des couches minces et des interconnexions de cuivre written by Magali Grégoire and published by . This book was released on 2006 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les procédés de fabrication des interconnexions de cuivre génèrent de fortes contraintes mécaniques au sein de celles-ci, qui sont à l'origine de la formation de cavités lors du fonctionnement des circuits intégrés. Ces cavités peuvent induire l'ouverture des circuits, ce qui détériore fortement leurs fiabilités. L'objectif de notre étude est d'analyser la formation des cavités sous contrainte et de déterminer les paramètres influant sur ce phénomène. L'influence des recuits sur la microstructure du cuivre est tout d'abord démontrée. Le module de Young des couches de cuivre est relié à leurs textures grâce à un modèle polycristallin. La température de contrainte nulle et le coefficient de dilatation thermique des couches de cuivre sont aussi déduits. Ces paramètres sont utilisés pour estimer les contraintes résiduelles dans les interconnexions de cuivre. Dans les lignes de cuivre, deux modes de formation des cavités sont observés, respectivement au dessous et au dessus de la température de contrainte nulle. Un seul mode a pu être détecté pour les interconnexions multi-niveaux. La comparaison des simulations par éléments finis et des résultats expérimentaux nous permet de relier l'état de contrainte dans les interconnexions au taux de germination et de croissance des cavités. Les propriétés de l'interface Curra semblent jouer un rôle primordial dans la formation des cavités et les nouveaux procédés de dépôt permettent de limiter leur germination. Un nouveau formalisme, permettant de décrire la germination et la croissance des cavités dans les interconnexions de cuivre, est proposé. Les énergies d'activation relatives à la formation des cavités sont alors déduites.
Download or read book Contribution l tude des propri t s optiques des couches minces d argent par ellipsom trie written by Ricra Kofman and published by . This book was released on 1970 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Contributions l tude des propri t s optiques non lin aires de nanoparticules en couches minces base de ZnO written by Zouhair Sofiani and published by . This book was released on 2007 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les semi-conducteurs transparents de type Aii Biv, continuent à susciter une attention considérable du point de vue fondamental et application, principalement en raison de leurs propriétés très exploitées. Une considération particulière a été portée sur l'oxyde de zinc qui est un semi-conducteur de type n possédant d'excellentes propriétés électriques, catalytiques et optiques, qui lui confèrent la possibilité d'être exploité dans de nombreux domaines tel que l'optoélectronique. Dans cette perspective, nous avons étudié l'influence du dopage, des températures de dépôt et de recuit, la nature du substrat et des techniques de dépôt sur la réponse optique non linéaire du ZnO. Nous avons constaté que la réponse non linéaire dépend énormément de ces paramètres. En particulier, nous avons démontré que la réponse non linéaire dépend de la qualité structurale et optique des couches minces.
Download or read book N Heterocyclic Carbenes written by Silvia Diez-Gonzalez and published by Royal Society of Chemistry. This book was released on 2016-11-04 with total page 637 pages. Available in PDF, EPUB and Kindle. Book excerpt: In less than 20 years N-heterocyclic carbenes (NHCs) have become well-established ancillary ligands for the preparation of transition metal-based catalysts. This is mainly due to the fact that NHCs tend to bind strongly to metal centres, avoiding the need of excess ligand in catalytic reactions. Also, NHC‒metal complexes are often insensitive to air and moisture, and have proven remarkably resistant to oxidation. This book showcases the wide variety of applications of NHCs in different chemistry fields beyond being simple phosphine mimics. This second edition has been updated throughout, and now includes a new chapter on NHC‒main group element complexes. It covers the synthesis of NHC ligands and their corresponding metal complexes, as well as their bonding and stereoelectronic properties and applications in catalysis. This is complemented by related topics such as organocatalysis and biologically active complexes. Written for organic and inorganic chemists, this book is ideal for postgraduates, researchers and industrialists.
Download or read book UNESCO General History of Africa Vol I Abridged Edition written by Jacqueline Ki-Zerbo and published by Univ of California Press. This book was released on 1990 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This volume covers the period from the end of the Neolithic era to the beginning of the seventh century of our era. This lengthy period includes the civilization of Ancient Egypt, the history of Nubia, Ethiopia, North Africa and the Sahara, as well as of the other regions of the continent and its islands."--Publisher's description
