Download or read book Film Growth and Characterization of Solution Processed MoS2 Semiconductor Films for Thin Film Transistors written by Francis Oliver Vinay Gomes and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Growth and Characterization of Molybdenum Disulfide Thin Films written by Carl Morris Gross (III) and published by . This book was released on 2016 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two-dimensional materials, or materials that are only one atomic layer thick, have seen much research in recent years because of their interesting electrical properties. The first of these materials, graphene, was found to have incredible electrical properties but lacked a bandgap in intrinsic films. Without a bandgap, graphene cannot create transistors that can be shut off. Molybdenum disulfide, however, is a two-dimensional semiconductor with a large bandgap. The main issue of molybdenum disulfide is that synthesized films are a much lower quality than their exfoliated counterparts. For molybdenum disulfide to be able to be used practically, a method of synthesis must be found that can reliably create quality large area monolayer films. In this thesis, three methods of molybdenum disulfide film synthesis are presented. Methods implemented used a tube furnace as a chemical vapor deposition system to evaporate source materials to synthesize thin films of molybdenum disulfide. An exploration into the different synthesis parameters shows optimal conditions for these specific methods. Then a discussion of these different methods is presented by judging films grown by using these methods on relevant criteria. This work shows methods to synthesize large area, polycrystalline, small grain, multilayer films, both intrinsic and doped, and to synthesize small area, single crystal and polycrystalline, monolayer films of molybdenum disulfide.

Download or read book Metal Based Thin Films for Electronics written by Klaus Wetzig and published by John Wiley & Sons. This book was released on 2006-03-06 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: This up-to-date handbook covers the main topics of preparation, characterization and properties of complex metal-based layer systems. The authors -- an outstanding group of researchers -- discuss advanced methods for structure, chemical and electronic state characterization with reference to the properties of thin functional layers, such as metallization and barrier layers for microelectronics, magnetoresistive layers for GMR and TMR, sensor and resistance layers. As such, the book addresses materials specialists in industry, especially in microelectronics, as well as scientists, and can also be recommended for advanced studies in materials science, analytics, surface and solid state science.

Download or read book Thin Films and Heterostructures for Oxide Electronics written by Satishchandra B. Ogale and published by Springer Science & Business Media. This book was released on 2005-11-21 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: Oxides form a broad subject area of research and technology development which encompasses different disciplines such as materials science, solid state chemistry, physics etc. The aim of this book is to demonstrate the interplay of these fields and to provide an introduction to the techniques and methodologies involving film growth, characterization and device processing. The literature in this field is thus fairly scattered in different research journals covering one or the other aspect of the specific activity. This situation calls for a book that will consolidate this information and thus enable a beginner as well as an expert to get an overall perspective of the field, its foundations, and its projected progress.

Download or read book Growth and Characterization of Novel Thin Films for Microelectronic Applications written by Mahmoud Vahidi and published by . This book was released on 2013 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt: I studied the properties of novel Co2FeAl0.5Si0.5 (CFAS), ZnGeAs2, and FeS2 (pyrite) thin films for microelectronic applications ranging from spintronic to photovoltaic. CFAS is a half metal with theoretical spin polarization of 100%. I investigated its potential as a spin injector, for spintronic applications, by studying the critical steps involved in the injection of spin polarized electron populations from tunnel junctions containing CFAS electrodes. Epitaxial CFAS thin films with L21 structure and saturation magnetizations of over 1200 emu/cm3 were produced by optimization of the sputtering growth conditions. Point contact Andreev reflection measurements show that the spin polarization at the CFAS electrode surface exceeds 70%. Analyses of the electrical properties of tunnel junctions with a superconducting Pb counter-electrode indicate that transport through native Al oxide barriers is mostly from direct tunneling, while that through the native CFAS oxide barriers is not. ZnGeAs2 is a semiconductor comprised of only inexpensive and earth-abundant elements. The electronic structure and defect properties are similar in many ways to GaAs. Thus, in theory, efficient solar cells could be made with ZnGeAs2 if similar quality material to that of GaAs could be produced. To understand the thermochemistry and determine the rate limiting steps of ZnGeAs2 thin-film synthesis, the (a) thermal decomposition rate and (b) elemental composition and deposition rate of films were measured. It is concluded that the ZnGeAs2 thin film synthesis is a metastable process with an activation energy of 1.08±0.05 eV for the kinetically-limited decomposition rate and an evaporation coefficient of ~10-3. The thermochemical analysis presented here can be used to predict optimal conditions of ZnGeAs2 physical vapor deposition and thermal processing. Pyrite (FeS2) is another semiconductor that has tremendous potential for use in photovoltaic applications if high quality materials could be made. Here, I present the layer-by-layer growth of single-phase pyrite thin-films on heated substrates using sequential evaporation of Fe under high-vacuum followed by sulfidation at S pressures between 1 mTorr and 1 Torr. High-resolution transmission electron microscopy reveals high-quality, defect-free pyrite grains were produces by this method. It is demonstrated that epitaxial pyrite layer was produced on natural pyrite substrates with this method.

Download or read book Emerging Electronic Materials written by Brent D. Keller and published by . This book was released on 2016 with total page 103 pages. Available in PDF, EPUB and Kindle. Book excerpt: Materials for energy and electronic applications is a rich ecosystem. This thesis describes the work I have performed with the help of my colleagues to push the boundaries of this space both in materials processing and unique materials development. In particular, I studied two classes of materials in detail. The first are disordered natural carbonaceous materials which I prepared from source material such as coal and asphaltenes. The second are two dimensional materials in particular transition metal dichalcogenides. Following an introduction to the materials I have studied in chapter 1, in chapters 2 and 3 I will discuss a class of materials which have seen extensive academic interest for energy and electronic applications: carbon materials. Specifically disordered carbon materials, both amorphous and with long-range order (for example, -C:H and reduced graphene oxide), have been used in a variety of optical and electronic applications from conductive additives and contact materials to transistors and photovoltaics. In contrast, the electronic properties of solid natural carbon materials such as coal have not been explored beyond basic bulk electrical conductivity measurements for correlation with combustion and gasification yields. I will discuss a number of exciting results from exploration of this neglected space: 1) Development of a method of fabrication of thin films of coal nanoparticles based on ball milling and solution processing 2) Chemical, electrical, structural, and optical characterization of the properties of coal thin films through Raman, X-ray photoelectron and UV-Vis spectroscopies as well as low temperature charge transport studies. 3) Fabrication of thin film Joule heating devices which compete with or outperform many reported synthetic materials. 4) Exploration of the electrical properties of thin films of asphaltenes and vacuum residuals for photovoltaic applications. Based on these experiments, the solid natural carbon phase space has proven to be rich and promising. Electrical conductivities range over orders of magnitude, and thermal treatment of the resulting films increases the sp2 content, disorder, and tunes the electrical conductivity in excess of 7 orders of magnitude. Optical absorption measurements demonstrate tunable optical gaps from 0 to 1.8 eV, and low-temperature conductivity measurements demonstrate that variable range hopping controls the electrical properties in both as-prepared and thermally treated films. The measured hopping energies further demonstrate electronic properties similar to vacuum deposited amorphous carbon materials and reduced graphene oxide. Next in chapter 4, while very promising work for square inch and larger scale methods of uniform monolayer deposition of 2-dimensional (2D) semiconductors such as MoS 2 has been performed, complete film growth and inhibition of bilayer or thicker nucleation has proven difficult. I will present a divergent growth method for MoS 2 via sulfurization of oxide deposited by both thermal ALD from (tBuN) 2 (NMe2 )2 Mo and O3 and plasma enhanced ALD (PEALD) from (tBuN)2 (NMe2 )2Mo and remote O2 plasma. Large uniform MoS 2 areas were achieved by studying the effects of various growth process conditions and surface treatments to control the nucleation and growth of MoO3 and through a detailed study of the chemistry of the film for varied post-sulfurization temperature profiles. Finally, as discussed in chapter 5, vapor deposition methods are not the only approaches to manufacture of 2D semiconductors. The ultimate in low cost fabrication is based on solution exfoliation of bulk material. After developing a process for depositing materials in this manner, I studied several chemical and thermal methods for removing cholate - a ligand used during the solution exfoliation process - from the films after deposition to improve the purity and quality of the films. I also worked with scotch tape mechanically exfoliated materials to test the properties of heterojunctions of MoS2 and graphene and demonstrate quenching of the MoS2 photoluminescence indicating charge injection into the graphene sheet.

Download or read book The Growth and Characterization of II IV Semiconductor Thin Films written by Anthony Michael Patterson and published by . This book was released on 1984 with total page 1681 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Growth and Characterization of Undoped and Doped Silicon Thin Films Using Supersonic Molecular Jets written by Rajeev Malik and published by . This book was released on 1996 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Growth and Characterization of II VI Semiconductor Thin Films written by A. M. Patterson and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Progress in Nanoscale and Low Dimensional Materials and Devices written by Hilmi Ünlü and published by Springer Nature. This book was released on 2022-10-18 with total page 939 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes most recent progress in the properties, synthesis, characterization, modelling, and applications of nanomaterials and nanodevices. It begins with the review of the modelling of the structural, electronic and optical properties of low dimensional and nanoscale semiconductors, methodology of synthesis, and characterization of quantum dots and nanowires, with special attention towards Dirac materials, whose electrical conduction and sensing properties far exceed those of silicon-based materials, making them strong competitors. The contributed reviews presented in this book touch on broader issues associated with the environment, as well as energy production and storage, while highlighting important achievements in materials pertinent to the fields of biology and medicine, exhibiting an outstanding confluence of basic physical science with vital human endeavor. The subjects treated in this book are attractive to the broader readership of graduate and advanced undergraduate students in physics, chemistry, biology, and medicine, as well as in electrical, chemical, biological, and mechanical engineering. Seasoned researchers and experts from the semiconductor/device industry also greatly benefit from the book’s treatment of cutting-edge application studies.

Download or read book Recent Advances in Thin Films written by Sushil Kumar and published by Springer Nature. This book was released on 2020-08-27 with total page 721 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume comprises the expert contributions from the invited speakers at the 17th International Conference on Thin Films (ICTF 2017), held at CSIR-NPL, New Delhi, India. Thin film research has become increasingly important over the last few decades owing to the applications in latest technologies and devices. The book focuses on current advances in thin film deposition processes and characterization including thin film measurements. The chapters cover different types of thin films like metal, dielectric, organic and inorganic, and their diverse applications across transistors, resistors, capacitors, memory elements for computers, optical filters and mirrors, sensors, solar cells, LED's, transparent conducting coatings for liquid crystal display, printed circuit board, and automobile headlamp covers. This book can be a useful reference for students, researchers as well as industry professionals by providing an up-to-date knowledge on thin films and coatings.

Download or read book Photoelectrochemical Hydrogen Production written by Roel van de Krol and published by Springer Science & Business Media. This book was released on 2011-11-09 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photoelectrochemical Hydrogen Production describes the principles and materials challenges for the conversion of sunlight into hydrogen through water splitting at a semiconducting electrode. Readers will find an analysis of the solid state properties and materials requirements for semiconducting photo-electrodes, a detailed description of the semiconductor/electrolyte interface, in addition to the photo-electrochemical (PEC) cell. Experimental techniques to investigate both materials and PEC device performance are outlined, followed by an overview of the current state-of-the-art in PEC materials and devices, and combinatorial approaches towards the development of new materials. Finally, the economic and business perspectives of PEC devices are discussed, and promising future directions indicated. Photoelectrochemical Hydrogen Production is a one-stop resource for scientists, students and R&D practitioners starting in this field, providing both the theoretical background as well as useful practical information on photoelectrochemical measurement techniques. Experts in the field benefit from the chapters on current state-of-the-art materials/devices and future directions.

Download or read book A Theoretical and Experimental Study Into the Kinetics of Solution Phase Thin Film Deposition written by Cyrus Schaaf and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The performance of electronic and optoelectronic devices based on solution-processed organic semiconductor layers is strongly influenced by their mesoscale polycrystalline structure, including domain size and spatial distributions. In solution-processed films prepared by spin casting, solvent-based printing, and related methods, morphology is governed by a combination of interrelated thermodynamic and kinetic factors. Classical models of crystal formation in bulk solution or on bare surfaces in vacuum-deposited films fail to adequately capture these effects; the current theoretical understanding of crystallization in solution-deposited films is generally unable to provide much insight, let alone predictive design guidance for tailoring films with specific structural characteristics for a given set of experimental conditions and chemical properties. In this thesis solution-phase thin film formation has been studied for the purpose of developing and new experimental techniques new models for understanding and predicting mesoscale film structure and crystal morphology. I will describe how nucleation can be modeled, and the predictions tested against experiment, by an approach that enables quantitative prediction of crystal coverage and intercrystalline spacing statistics as a function of processing conditions, using only a small number of experimentally-measureable parameters. To do this, a model is introduced that combines a mean-field rate equation treatment of monomer aggregation kinetics with classical nucleation theory and a supersaturation-dependent critical nucleus size to solve for the quasi-two-dimensional temporally- and spatially-varying monomer concentration and nucleation rate. Excellent agreement is observed with measured nucleation densities and inter-domain radial distribution functions in submonolayer tetracene films. The model leads to the first universal set of predictive design rules for solution-phase thin film growth capable of guiding the selection of experimental conditions for truly engineered morphological control. Accompanying this theoretical work a first of its kind experiment is also reported, in which monomer concentration has been spatially and temporally mapped in real time during the film formation process. Through the use of high resolution dark field fluorescence microscopy employing an internal fluorescent standard and multi-wavelength imaging optics the concentration dependence is visualized throughout all regimes of thin film formation. In situ measurements of local concentration contributes to the development of models which treat the role of variations in monomer concentration on mesoscale film morphology of polycrystalline thin films. This work opens the door to numerous studies enabling further development of models which allow for predictive control of polycrystalline thin films in solution-phase deposition techniques. In addition to nucleation, growth of crystalline films is modeled through a set of numerical and computational methods which provide insight into the main factors influencing crystal growth habit. It is shown that crystal capture rate correlation with physical properties displays a distinct lack of agreement between the spacing and initial sizes of crystals with their relative growth rates. This lack of correlation points to the need for more sophisticated models. Through the use of a mean field numerical calculation of the volumetric growth rate changes in crystal morphology can be attributed to a variable sticking probability which depends on the crystal face. Kinetic Monte Carlo simulations are used to directly probe the physics which explain the deviation from the typical single sticking coefficient capture model. The change in shape at long deposition times further suggests that crystal growth occurs in distinct regimes which dictate the final morphology of the crystals. This work provides an explanation to the change in shape of crystalline material at long deposition times which can be used to develop models to predict final crystal morphology. This thesis is comprised of several parts. In the first chapter the broader context of the work is discussed. In chapter 2, I discuss the scientific background laying the foundation for theoretical models into solution-phase deposition. In the third chapter, I describe the experimental system as well as results from various measurements of fundamental chemical and physical properties needed later. The fourth chapter describes a set of models which I have developed to predict mesoscale film structure to create a set of universal design rules in order to engineer thin films grown in the solution-phase. In chapter 5, I describe a state of the art experimental set up allowing for monomer concentration to be mapped in real time. Finally in the last chapter I describe a set of exploratory models to describe change in crystal morphology during the course of thin film formation. This thesis creates new understanding, which will allow for an increase in production of thin films for applications where strict control over domain size, shape, spacing, and crystallographic orientation.

Download or read book Evolution of Thin Film Morphology written by Matthew Pelliccione and published by Springer Science & Business Media. This book was released on 2008-01-29 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Synthesis and Characterization of 2D TMDs Thin Films flakes by Various Solution Processed Deposition Methods for Different Applications written by Talha Nisar and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1991 with total page 1460 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Download or read book 2D Materials for Electronics Sensors and Devices written by Saptarshi Das and published by Elsevier. This book was released on 2022-09-14 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: 2D Materials for Electronics, Sensors and Devices: Synthesis, Characterization, Fabrication and Application provides an overview of various top-down and bottom-up synthesis techniques, along with stitching, stacking and stoichiometric control methods for different 2D materials and their heterostructures. The book focuses on the widespread applications of various 2D materials in high-performance and low-power sensors, field effect devices, flexible electronics, straintronics, spintronics, brain-inspired electronics, energy harvesting and energy storage devices. This is an important reference for materials scientists and engineers looking to gain a greater understanding on how 2D materials are being used to create a range of low cost, sustainable products and devices. - Discusses the major synthesis and preparation methods of a range of emerging 2D electronic materials - Provides state-of–the-art information on the most recent advances, including theoretical and experimental studies and new applications - Discusses the major challenges of the mass application of 2D materials in industry