Thin Film Morphology Control by Electronic and Chemical Interactions PDF Download
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Author: Dezheng Sun
Publisher: LAP Lambert Academic Publishing
ISBN: 9783659195013
Category :
Languages : en
Pages : 76
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Book Description
Studies of thin film growth involve interdependent chemical, electronic and mechanical properties whose comprehensive understanding is critical for predicting thin film morphology and properties. Self assembly of organic molecules on a metal substrate lays the groundwork for structures desired in nanotechnology applications. The three classes of films which I investigate are: monolayer MoS2 with strong Mo-S bonding, anthracene films formed by weak van der Waals interactions, and anthraquinine (AQ) honeycomb networks assembled by the interplay of local hydrogen bonding and substrate-mediated long range interactions. In this book, scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS) and angular resolved ultraviolet photoelectron spectroscopy (ARUPS) have been used to investigate monolayer and sub-monolayer thin films grown on a Cu(111) substrate. My research focuses on the use of STM, XPS and ARUPS to investigate the role of ionic bonding, van der Waals interaction, hydrogen bonding and surface mediated interactions during growth of thin films and how to tailor the film morphology by controlling these interactions.
Author: Dezheng Sun
Publisher: LAP Lambert Academic Publishing
ISBN: 9783659195013
Category :
Languages : en
Pages : 76
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Book Description
Studies of thin film growth involve interdependent chemical, electronic and mechanical properties whose comprehensive understanding is critical for predicting thin film morphology and properties. Self assembly of organic molecules on a metal substrate lays the groundwork for structures desired in nanotechnology applications. The three classes of films which I investigate are: monolayer MoS2 with strong Mo-S bonding, anthracene films formed by weak van der Waals interactions, and anthraquinine (AQ) honeycomb networks assembled by the interplay of local hydrogen bonding and substrate-mediated long range interactions. In this book, scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS) and angular resolved ultraviolet photoelectron spectroscopy (ARUPS) have been used to investigate monolayer and sub-monolayer thin films grown on a Cu(111) substrate. My research focuses on the use of STM, XPS and ARUPS to investigate the role of ionic bonding, van der Waals interaction, hydrogen bonding and surface mediated interactions during growth of thin films and how to tailor the film morphology by controlling these interactions.
Author: Dezheng Sun
Publisher:
ISBN: 9781267268440
Category : Anthracene
Languages : en
Pages : 70
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Book Description
Thin film growth technology develops rapidly with the requirement of understanding the mechanical and electronic interaction and how they will control the Morphology of the film. Self-assembly of the organic molecules on metal substrate provide a bottom-up path toward building up desires conformation for nanotechnology application. In this study, STM and Photoelectron Spectroscopy have been used to investigate monolayer or sub-monolayer thin film grown on Cu(111) substrate. To be more specific, The films I investigate are monolayer MoS2 formed by strong covalent bonding between Mo and S atoms, Anthracene thin film formed by weak van der Waals interaction and Anthraquinone (AQ) honeycomb network form by hydrogen bonding and other long range surface mediated interaction. My research interest is using STM, XPS and ARUPS to investigate what is the role of these interactions during the growth of the thin film and how to control the film morphology by controlling these interactions.
Author: Matthew Pelliccione
Publisher: Springer Science & Business Media
ISBN: 0387751092
Category : Technology & Engineering
Languages : en
Pages : 206
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Book Description
The focus of this book is on modeling and simulations used in research on the morphological evolution during film growth. The authors emphasize the detailed mathematical formulation of the problem. The book will enable readers themselves to set up a computational program to investigate specific topics of interest in thin film deposition. It will benefit those working in any discipline that requires an understanding of thin film growth processes.
Author: Andreas Jamnig
Publisher: Linköping University Electronic Press
ISBN: 9179298206
Category :
Languages : en
Pages : 108
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Book Description
Vapor-based growth of thin metal films with controlled morphology on weakly-interacting substrates (WIS), including oxides and van der Waals materials, is essential for the fabrication of multifunctional metal contacts in a wide array of optoelectronic devices. Achieving this entails a great challenge, since weak film/substrate interactions yield a pronounced and uncontrolled 3D morphology. Moreover, the far-from-equilibrium nature of vapor-based film growth often leads to generation of mechanical stress, which may further compromise device reliability and functionality. The objectives of this thesis are related to metal film growth on WIS and seek to: (i) contribute to the understanding of atomic-scale processes that control film morphological evolution; (ii) elucidate the dynamic competition between nanoscale processes that govern film stress generation and evolution; and (iii) develop methodologies for manipulating and controlling nanoscale film morphology between 2D and 3D. Investigations focus on magnetron sputter-deposited Ag and Cu films on SiO2 and amorphous carbon (a-C) substrates. Research is conducted by strategically combining of in situ and real-time film growth monitoring, ex situ chemical and (micro)-structural analysis, optical modelling, and deterministic growth simulations. In the first part, the scaling behavior of characteristic morphological transition thicknesses (i.e., percolation and continuous film formation thickness) during growth of Ag and Cu films on a-C are established as function of deposition rate and temperature. These data are interpreted using a theoretical framework based on the droplet growth theory and the kinetic freezing model for island coalescence, from which the diffusion rates of film forming species during Ag and Cu growth are estimated. By combining experimental data with ab initio molecular dynamics simulations, diffusion of multiatomic clusters, rather than monomers, is identified as the rate-limiting structure-forming process. In the second part, the effect of minority metallic or gaseous species (Cu, N2, O2) on Ag film morphological evolution on SiO2 is studied. By employing in situ spectroscopic ellipsometry, it is found that addition of minority species at the film growth front promotes 2D morphology, but also yields an increased continuous-layer resistivity. Ex situ analyses show that 2D morphology is favored because minority species hinder the rate of coalescence completion. Hence, a novel growth manipulation strategy is compiled in which minority species are deployed with high temporal precision to selectively target specific film growth stages and achieve 2D morphology, while retaining opto-electronic properties of pure Ag films. In the third part, the evolution of stress during Ag and Cu film growth on a-C and its dependence on growth kinetics (as determined by deposition rate, substrate temperature) is systematically investigated. A general trend toward smaller compressive stress magnitudes with increasing temperature/deposition rate is found, related to increasing grain size/decreasing adatom diffusion length. Exception to this trend is found for Cu films, in which oxygen incorporation from the residual growth atmosphere at low deposition rates inhibits adatom diffusivity and decreases the magnitude of compressive stress. The effect of N2 on stress type and magnitude in Ag films is also studied. While Ag grown in N2-free atmosphere exhibits a typical compressive-tensile-compressive stress evolution as function of thickness, addition of a few percent of N2 yields to a stress turnaround from compressive to tensile stress after film continuity which is attributed to giant grain growth and film roughening. The overall results of the thesis provide the foundation to: (i) determine diffusion rates over a wide range of WIS film/substrates systems; (ii) design non-invasive strategies for multifunctional contacts in optoelectronic devices; (iii) complete important missing pieces in the fundamental understanding of stress, which can be used to expand theoretical descriptions for predicting and tuning stress magnitude. La morphologie de films minces métalliques polycristallins élaborés par condensation d’une phase vapeur sur des substrats à faible interaction (SFI) possède un caractère 3D intrinsèque. De plus, la nature hors équilibre de la croissance du film depuis une phase vapeur conduit souvent à la génération de contraintes mécaniques, ce qui peut compromettre davantage la fiabilité et la fonctionnalité des dispositifs optoélectroniques. Les objectifs de cette thèse sont liés à la croissance de films métalliques sur SFI et visent à: (i) contribuer à une meilleure compréhension des processus à l'échelle atomique qui contrôlent l'évolution morphologique des films; (ii) élucider les processus dynamiques qui régissent la génération et l'évolution des contraintes en cours de croissance; et (iii) développer des méthodologies pour manipuler et contrôler la morphologie des films à l'échelle nanométrique. L’originalité de l’approche mise en œuvre consiste à suivre la croissance des films in situ et en temps réel par couplage de plusieurs diagnostics, complété par des analyses microstructurales ex situ. Les grandeurs mesurées sont confrontées à des modèles optiques et des simulations atomistiques. La première partie est consacrée à une étude de comportement d’échelonnement des épaisseurs de transition morphologiques caractéristiques, à savoir la percolation et la continuité du film, lors de la croissance de films polycristallins d'Ag et de Cu sur carbone amorphe (a-C). Ces grandeurs sont examinées de façon systématique en fonction de la vitesse de dépôt et de la température du substrat, et interprétées dans le cadre de la théorie de la croissance de gouttelettes suivant un modèle cinétique décrivant la coalescence d’îlots, à partir duquel les coefficients de diffusion des espèces métalliques sont estimés. En confrontant les données expérimentales à des simulations par dynamique moléculaire ab initio, la diffusion de clusters multiatomiques est identifiée comme l’étape limitante le processus de croissance. Dans la seconde partie, l’incorporation, et l’impact sur la morphologie, d’espèces métalliques ou gazeuses minoritaires (Cu, N2, O2) lors de la croissance de film Ag sur SiO2 est étudié. A partir de mesures ellipsométriques in situ, on constate que l'addition d'espèces minoritaires favorise une morphologie 2D, entravant le taux d'achèvement de la coalescence, mais donne également une résistivité accrue de la couche continue. Par conséquent, une stratégie de manipulation de la croissance est proposée dans laquelle des espèces minoritaires sont déployées avec une grande précision temporelle pour cibler sélectivement des stades de croissance de film spécifiques et obtenir une morphologie 2D, tout en conservant les propriétés optoélectroniques des films d’Ag pur. Dans la troisième partie, l'évolution des contraintes résiduelles lors de la croissance des films d'Ag et de Cu sur a-C et leur dépendance à la cinétique de croissance est systématiquement étudiée. On observe une tendance générale vers des amplitudes de contrainte de compression plus faibles avec une augmentation de la température/vitesse de dépôt, liée à l'augmentation de la taille des grains/à la diminution de la longueur de diffusion des adatomes. Également, l’ajout dans le plasma de N2 sur le type et l'amplitude des contraintes dans les films d'Ag est étudié. L'ajout de quelques pourcents de N2 en phase gaz donne lieu à un renversement de la contrainte de compression et une évolution en tension au-delà de la continuité du film. Cet effet est attribué à une croissance anormale des grains géants et le développement de rugosité de surface. L’ensemble des résultats obtenus dans cette thèse fournissent les bases pour: (i) déterminer les coefficients de diffusion sur une large gamme de systèmes films/SFI; (ii) concevoir des stratégies non invasives pour les contacts multifonctionnels dans les dispositifs optoélectroniques; (iii) apporter des éléments de compréhension à l’origine du développement de contrainte, qui permettent de prédire et contrôler le niveau de contrainte intrinsèque à la croissance de films minces polycristallins.
Author: Horst-Günter Rubahn
Publisher: Springer Science & Business Media
ISBN: 3540959300
Category : Technology & Engineering
Languages : en
Pages : 208
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Book Description
Organic semiconductors are a central topic of advanced materials research. The book is aiming at bridging the gap between the development and production of devices and basic research on thin film characterisation using cutting-edge techniques in surface and interface science. Topics involve organic molecular-based sensors; interfaces in organic diodes and transistors; mobility in organic field effect transistors and space charge problems; integration of optoelectronic nanostructures; nonlinear optical properties of organic nanostructures; the wetting layer problem; how to get from functionalized molecules to nanoaggregates; optical, electrical and mechanical properties of organic nanofibers as well; as near field investigations of organic thin films.
Author: Yoshio Waseda
Publisher: Springer Science & Business Media
ISBN: 3662088630
Category : Technology & Engineering
Languages : en
Pages : 271
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Book Description
This is the first major compilation of new advances covering the current status and topics related to the processing and production of precisely controlled materials. It provides a unique source of information and guidance for specialists and non-specialists alike. This book represents an extended introductory treatise on the fundamental aspects, new methods for the precise control of morphology (size, shape, composition, structure etc.) and accurate materials characterization, from both the basic science and the applied engineering viewpoints.
Author: Soumen Das
Publisher: Elsevier
ISBN: 0128197188
Category : Technology & Engineering
Languages : en
Pages : 746
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Book Description
Chemical Solution Synthesis for Materials Design and Thin Film Device Applications presents current research on wet chemical techniques for thin-film based devices. Sections cover the quality of thin films, types of common films used in devices, various thermodynamic properties, thin film patterning, device configuration and applications. As a whole, these topics create a roadmap for developing new materials and incorporating the results in device fabrication. This book is suitable for graduate, undergraduate, doctoral students, and researchers looking for quick guidance on material synthesis and device fabrication through wet chemical routes. Provides the different wet chemical routes for materials synthesis, along with the most relevant thin film structured materials for device applications Discusses patterning and solution processing of inorganic thin films, along with solvent-based processing techniques Includes an overview of key processes and methods in thin film synthesis, processing and device fabrication, such as nucleation, lithography and solution processing
Author: Arne Wittstock
Publisher: Royal Society of Chemistry
ISBN: 184973528X
Category : Technology & Engineering
Languages : en
Pages : 265
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Book Description
High-surface-area materials have recently attracted significant interest due to potential applications in various fields such as electrochemistry and catalysis, gas-phase catalysis, optics, sensors and actuators, energy harvesting and storage. In contrast to classical materials the properties of high-surface-area materials are no longer determined by their bulk, but by their nanoscale architecture. Nanoporous gold (np-Au) represents the fascinating class of mesoporous metals that have been intensively investigated in recent years. The current interest and the increasing number of scientific publications show that np-Au by itself is an outstanding nano-material that justifies a book devoted to all aspects of its properties and applications. The resulting publication is a discussion of this unique nano-material and is an accessible and comprehensive introduction to the field. The book provides a broad, multi-disciplinary platform to learn more about the properties of nanoporous gold from an inter-disciplinary perspective. It starts with an introduction and overview of state-of-the-art applications and techniques characterizing this material and its applications. It then covers the progress in research within the last years. The chapters are in-depth overviews written by the world's leading scientists in the particular field. Each chapter covers one technique or application so that the reader can easily target their favoured topic and will get the latest and state-of-the-art information in the field.
Author: Kasturi Chopra
Publisher: Springer Science & Business Media
ISBN: 1461336821
Category : Science
Languages : en
Pages : 305
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Book Description
Two-dimensional materials created ab initio by the process of condensation of atoms, molecules, or ions, called thin films, have unique properties significantly different from the corresponding bulk materials as a result of their physical dimensions, geometry, nonequilibrium microstructure, and metallurgy. Further, these characteristic features of thin films can be drasti cally modified and tailored to obtain the desired and required physical characteristics. These features form the basis of development of a host of extraordinary active and passive thin film device applications in the last two decades. On the one extreme, these applications are in the submicron dimensions in such areas as very large scale integration (VLSI), Josephson junction quantum interference devices, magnetic bubbles, and integrated optics. On the other extreme, large-area thin films are being used as selective coatings for solar thermal conversion, solar cells for photovoltaic conver sion, and protection and passivating layers. Indeed, one would be hard pressed to find many sophisticated modern optical and electronic devices which do not use thin films in one way or the other. With the impetus provided by industrial applications, the science and technology of thin films have undergone revolutionary development and even today continue to be recognized globally as frontier areas of RID work. Major technical developments in any field of science and technology are invariably accompanied by an explosion of published literature in the form of scientific publications, reviews, and books.
Author: B. G. Demczyk
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 696
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Book Description
The MRS Symposium Proceeding series is an internationally recognised reference suitable for researchers and practitioners.
