Electronic Properties Of Nanoclusters In Amorphous Materials
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| Author | : Mikio Fukuhara |
| Publisher | : Cambridge Scholars Publishing |
| Total Pages | : 157 |
| Release | : 2019-09-17 |
| Genre | : Science |
| ISBN | : 152754009X |
Nanometre-sized clusters (nanoclusters) that make up amorphous materials (metallic alloys and organic and inorganic compounds) cast new light on the science and technology of this century. However, because various electronic characteristics of nanoclusters have been discovered during the past decade, there have been few publications concerned with the electronic properties of nanoclusters. This book presents a detailed study of these properties, beginning with their basic characteristics (from alloy synthesis to the electronic rule for the formation of amorphous alloys) to more technical aspects (such as new single electron transistors, superior ballistic conduction).
| Author | : M.F. Thorpe |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 451 |
| Release | : 2012-12-06 |
| Genre | : Science |
| ISBN | : 9401009147 |
The aim of this NATO ASI has been to present an up-to-date overview of current areas of interest in amorphous materials, with particular emphasis on electronic properties and device applications. In order to limit the material to a manageable amount, the meeting was concerned almost exclusively with semiconducting materials. This volume should be regarded as a follow-on to the NATO ASI held in Sozopol, Bulgaria in 1996 and published as "Amorphous Insulators and Semiconductors" edited by M.F. Thorpe and M.1. Mitkova (Kluwer Academic Publishers, NATO ASI series, 3 High Technology - Vol. 23). The lectures and seminars fill the gap between graduate courses and research seminars. The lecturers and seminar speakers were chosen as experts in their respective areas, and the lectures and seminars that were given are presented in this volume. During the first week of the meeting, an emphasis was placed on introductory lectures while the second week focused more on research seminars. There were two very good poster sessions that generated a lot of discussion, but these are not reproduced in this volume as the editors wanted to have only larger contributions to make the proceedings more coherent.
| Author | : Kazuo Morigaki |
| Publisher | : John Wiley & Sons |
| Total Pages | : 286 |
| Release | : 2017-03-06 |
| Genre | : Technology & Engineering |
| ISBN | : 1118757920 |
Amorphous semiconductors are subtances in the amorphous solid state that have the properties of a semiconductor and which are either covalent or tetrahedrally bonded amorphous semiconductors or chelcogenide glasses. Developed from both a theoretical and experimental viewpoint Deals with, amongst others, preparation techniques, structural, optical and electronic properties, and light induced phenomena Explores different types of amorphous semiconductors including amorphous silicon, amorphous semiconducting oxides and chalcogenide glasses Applications include solar cells, thin film transistors, sensors, optical memory devices and flat screen devices including televisions
| Author | : Kazuo Morigaki |
| Publisher | : World Scientific |
| Total Pages | : 440 |
| Release | : 1999 |
| Genre | : Technology & Engineering |
| ISBN | : 9789810213817 |
This is a useful textbook for graduate students in the fields of solid state physics and chemistry as well as electronic engineering. Presenting the fundamentals of amorphous semiconductors clearly, it will be essential reading for young scientists intending to develop new preparation techniques for more ideal amorphous semiconductors e.g. a-Si: H, to fabricate stable and efficient solar cells and thin film transistors and new artificial amorphous materials such as multilayers for quantum devices.A large portion is devoted to the latest developments of amorphous semiconductors including electronic properties of a-Si: H, nature of weak bonds and gap states in a-Si: H, mechanisms for light-induced defect creation in a-Si: H and chalcogenides, quantum phenomena in multilayer fi
| Author | : Janet Caroline Dawson |
| Publisher | : |
| Total Pages | : |
| Release | : 1993 |
| Genre | : |
| ISBN | : |
| Author | : Alexey Tal |
| Publisher | : Linköping University Electronic Press |
| Total Pages | : 92 |
| Release | : 2018-03-15 |
| Genre | : |
| ISBN | : 9176853497 |
Nanoclusters have gained a huge interest due to their unique properties. They represent an intermediate state between an atom and a solid, which manifests itself in their atomic configurations and electronic structure. The applications of nanoclusters require detailed understanding of their properties and strongly depend on the ability to control their synthesis process. Significant effort has been invested in modelling of nanoclusters properties. However, the complexity of these systems is such that many aspects of their growth process and properties are yet to be understood. My thesis focuses on describing structural and electronic properties of nanoclusters. In particular, the model for nanoparticles growth in plasma condition is developed and applied, allowing to describe the influence of the plasma conditions on the evaporation, growth and morphological transformation processes. The mechanism driving the morphology transition from icosahedral to decahedral phase is suggested based on force-fields models. Spectroscopic methods allow for precise characterization of nanoclusters and constitute an important tool for analysis of their electronic structure of valence band as well as core-states. The special attention in the thesis is paid to the core-states of nanoclusters and influences that affect them. In particular, the effects of local coordination, interatomic distances and confinement effects are investigated in metal nanoclusters by density functional theory methods. These effects and their contribution to spectroscopic features of nanoclusters in X-ray photoemission are modelled. The relation between the reactivity of nanoclusters and their spectroscopic features calculated in different approximations are revealed and explained. Ceria is a very important system for many applications due to the ability of cerium atoms to change their oxidation state depending on the environment. The shift of the oxidation state and its effects on the core-states is examined with X-ray absorption measurements and modelling allowing to build a rigid foundation for interpretation of the measured spectra and characterization of electronic structure of ceria nanoparticles.
| Author | : Julio A. Alonso |
| Publisher | : World Scientific |
| Total Pages | : 492 |
| Release | : 2012 |
| Genre | : Science |
| ISBN | : 1848167342 |
Atomic clusters are aggregates of atoms containing a few to several thousand atoms. Due to the small size of these pieces of matter, the properties of atomic clusters in general are different from those of the corresponding material in the macroscopic bulk phase. This monograph presents the main developments of atomic clusters and the current status of the field. The book treats different types of clusters with very different properties: clusters in which the atoms or molecules are tied by weak van der Waals interactions, metallic clusters, clusters of ionic materials, and network clusters made of typical covalent elements. It includes methods of experimental cluster synthesis as well as the structural, electronic, thermodynamic and magnetic properties of clusters, covering both experiments and the theoretical work that has led to our present understanding of the different properties of clusters. The question of assembling nanoclusters to form solids with new properties is also considered. Having an adequate knowledge of the properties of clusters can be of great help to any scientist working with objects of nanometric size. On the other hand, nanoclusters are themselves potentially important in fields like catalysis and nanomedicine.
| Author | : Philip Craig Taylor |
| Publisher | : |
| Total Pages | : 1548 |
| Release | : 2020 |
| Genre | : Amorphous substances |
| ISBN | : 9789811215933 |
"Amorphous solids (including glassy and non-crystalline solids) are ubiquitous since the vast majority of solids naturally occurring in our world are amorphous. Although the field is diverse and complex, this three-volume set covers the vast majority of the important concepts needed to understand these materials and their principal practical applications. One volume discusses the most important subset of amorphous insulators, namely oxide glasses; the other two volumes discuss the most important subsets of amorphous semiconductors, namely tetrahedrally coordinated amorphous semiconductors and amorphous and glassy chalcogenides. Together these three volumes provide a comprehensive set of theoretical concepts and practical information needed to become conversant in the field of amorphous materials. They are suitable for advanced graduate students, postdoctoral research associates, and researchers wishing to change fields or sub-fields. The topics covered in these three volumes include (1) concepts for understanding the structures of amorphous materials, (2) techniques to characterize the structural, electronic, and optical properties of amorphous materials, (3) the roles of defects in affecting the electronic and optical properties of amorphous materials, and (4) the concepts for understanding practical devices and other applications of amorphous materials. Applications discussed in these volumes include transistors, solar cells, displays, bolometers, fibers, non-volatile memories, vidicons, photoresists, and optical disks"--Publisher's website.
| Author | : A. Inoue |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 216 |
| Release | : 2013-04-17 |
| Genre | : Technology & Engineering |
| ISBN | : 3662044269 |
Amorphous and nanocrystalline materials are a class of their own. Their properties are quite different to those of the corresponding crystalline materials. This book gives systematic insight into their physical properties, structure, behaviour, and design for special advanced applications.
| Author | : |
| Publisher | : |
| Total Pages | : 16 |
| Release | : 1992 |
| Genre | : |
| ISBN | : |
The use of a three dimensional crystalline superlattice as a host for cluster synthesis adds several important dimensions to the design of semiconductor quantum confined structures. Cluster geometry and size distribution are controlled by the topography of the three dimensional host surface, making it possible to create semiconductor quantum superlattices. Novel, normally very unstable, nanosized clusters can be synthesized via encapsulation and coordination to the host framework. The use of large three dimensional surface areas permits studies of cluster interactions over a wide range of concentrations and at relatively high optical densities. Cluster electronic properties can be altered by varying the dielectric and charge properties of the nanoporous host. In addition to single crystals, the porous glasses add new possibilities for following the chemistry involved in forming small semiconductor particles, as well as determining their photophysical properties.
