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Development And Characterization Of Pulsed Laser Deposited Tungsten Oxide Thin Films For Electrochromic Applications
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Book Synopsis Development and Characterization of Pulsed Laser Deposited Tungsten Oxide Thin Films for Electrochromic Applications by : Syed Ali Shamoel Zaidi
Download or read book Development and Characterization of Pulsed Laser Deposited Tungsten Oxide Thin Films for Electrochromic Applications written by Syed Ali Shamoel Zaidi and published by . This book was released on 2013 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: In order to fabricate layered electrochromic devices capable of reversibly changing color in response to applied voltage, pulsed laser deposition was used to deposit thin films of tungsten oxide on fluorine doped tin oxide substrates.The thin films were deposited at room temperature in an O2 atmosphere of the order of 10−1 mbar on FTO/glass substrates using a KrF pulsed laser source. XRD analysis confirmed the resulting films to be amorphous and UV-Vis spectroscopy confirmed transparency. Raman shift confirms non-crystalline WO3 presence. Electrochromic devices were connected to a cyclic voltammetry system to regulate voltage sweeps, investigate charge transport, response time and reversibility of color/bleached states. Scanning electron microscopy was performed on the films post device operation to examine the surface topography and composition. Raman spectroscopy and XRD was performed post device films to investigate any changes in the films. Li+ ion conducting glasses of composition xLi2SO4 - (1-x)[0.50Li2O-0.5(2NH4H2PO2)) were characterized using resistivity measurements and neutron diffraction experiments to evaluate them as suitable substitutes for the electrolyte in the electrochromic devices. Formation of crystallites above 400°C has been observed which is understood to hamper Li+ ion mobility, resulting in reduced performance of the electrolyte. The acid based electrochromic devices have exhibited superior reversibility.
Book Synopsis Fabrication and Characterization of Tungsten Oxide Based Electrochromic Devices Grown by Pulsed Laser Deposition by : Alex Miller
Download or read book Fabrication and Characterization of Tungsten Oxide Based Electrochromic Devices Grown by Pulsed Laser Deposition written by Alex Miller and published by . This book was released on 2013 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this work was to fabricate electrochromic devices made with pulsed laser deposited tungsten oxide films and evaluate the effects of material properties on device performance. The oxide films were deposited in O2 atmospheres from 10-3 - 10-1 mbar on ITO/glass substrates between room temperature (RT) and 450 °C. A pulsed KrF laser operating at 248 nm was used to ablate the WO3 target. XRD analysis showed amorphous native films for RT depositions and orthorhombic poly-crystalline films deposited at 450 °C. UV-Vis spectroscopy showed transparent films deposited at 10-1 mbar and opaque films for lower chamber pressures. For depositions at RT, atomic force microscopy revealed ultra-smooth surfaces for films deposited at 10-2 mbar and disordered/porous surface morphology for films deposited at 10-1 mbar. With the substrate temperature at 450 °C, the topography had visible grain patterns. IV measurements were done on films grown at different chamber pressures. Preliminary devices were constructed by sandwiching a drop of 2.0-M HCl between the oxide/ITO/glass and a top ITO/glass electrode. Cyclic voltammetry was used to automate the bias potential, determine charge insertion, and investigate response time and the effects of repeated cycles. Devices constructed with opaque oxygen-deficient or poly-crystalline tungsten oxide films displayed poor electrochromism while devices constructed with transparent amorphous WO3 films (deposited at 10-1 mbar and RT) exhibited electrochromic properties including a large optical modulation (76.1 %T at 705 nm) and a coloration efficiency of 11 cm2/C.
Book Synopsis Growth and Characterization of Wide-gap Semiconducting Oxide and Chalcogenide Thin Films by Pulsed Laser Deposition by : Paul F. Newhouse
Download or read book Growth and Characterization of Wide-gap Semiconducting Oxide and Chalcogenide Thin Films by Pulsed Laser Deposition written by Paul F. Newhouse and published by . This book was released on 2008 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt: The preparation and characterization of thin film oxides and chalcogenides by pulsed laser deposition (PLD) is presented. An overview of fundamental PLD concepts are presented and are followed by a description implementation and development of the PLD systems at OSU. We present the results of thin film growth of high electron mobility In2O3:W in which we have prepared films exhibiting □ > 100 cm2/Vs on vitreous SiO2 substrates. The growth of Cu3TaQ 4 (Q = S, Se) films is outlined as a two step process consisting of PLD of ceramic targets followed by ex-situ annealing in chalcogenide vapor. Also, BiCuOSe thin films have been prepared in-situ and exhibit a high hole mobility up to 4 cm2/Vs. A discussion of their electronic structure is presented which explains the nature of the low band gap energy on the basis of deep Bi 6p level at the conduction band minimum. Finally, the results of BaBiO3 thin film preparation are presented in which both polycrystalline and highly (00l) oriented samples were grown.
Book Synopsis Pulsed Laser Deposition Assisted Synthesis and Characterization of Titanium Dioxide Thin Films by : Jermaine Maurice Bradley
Download or read book Pulsed Laser Deposition Assisted Synthesis and Characterization of Titanium Dioxide Thin Films written by Jermaine Maurice Bradley and published by . This book was released on 2005 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: Investigates the structural and mechanical properties of pulsed laser deposited (PLD) titania (TiO2) thin films. Uses nano-indentation to determine the mechanical properties of the films as a function of the growth parameters.
Author :Satishchandra B. Ogale Publisher :Springer Science & Business Media ISBN 13 :0387260897 Total Pages :416 pages Book Rating :4.3/5 (872 download)
Book Synopsis Thin Films and Heterostructures for Oxide Electronics by : Satishchandra B. Ogale
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.
Book Synopsis Investigations of PLD Grown Tungsten Oxide Thin Films by : Anthony Thomas Pelton
Download or read book Investigations of PLD Grown Tungsten Oxide Thin Films written by Anthony Thomas Pelton and published by . This book was released on 2017 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pulsed laser deposition (PLD) is a promising technique for creating inexpensive, nanostructured thin films which may lead to structures suitable for photocatalysis. During this study, multiple tungsten oxide thin films were prepared using two types of PLD techniques. The first method was conducted at US Photonics, Springfield, MO, using a femtosecond laser while the second method relied on use of an excimer (nanosecond) laser located at Missouri State University. Films were first deposited on glass using both methods at room temperature. Further study was conducted on thin films deposited on sapphire and silicon deposited at room temperatures and at elevated temperatures. In addition to using two types of PLD, an investigation of the properties of tungsten oxide thin films incorporated with alkali metals was conducted. This was achieved by preparing a target using tungsten oxide with small amounts of sodium nitrate (NaNO3). The addition of alkali metals has been known to change the structure as well as the electrical, chemical, and physical properties of the bulk material. After deposition, the thin films were annealed at 450°C up to 30 hours in air. Characterization of the films’ structure and morphology were made using scanning electron microscopy (SEM), x-ray diffraction (XRD), Raman spectroscopy, and x-ray photoelectron spectroscopy (XPS) both before and after annealing. Characterization of the films allowed me to determine which method of PLD as well as which substrate (glass, silicon, or sapphire) is more suitable for growing thin films suitable for photocatalysis applications.
Book Synopsis Physical and Electrical Characterization of Hafnium Oxide Thin Films Deposited by Pulsed Laser Deposition Technique by : Bhanu P. Dharmaiahgari
Download or read book Physical and Electrical Characterization of Hafnium Oxide Thin Films Deposited by Pulsed Laser Deposition Technique written by Bhanu P. Dharmaiahgari and published by . This book was released on 2004 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Thin Films on Glass written by Hans Bach and published by Springer Science & Business Media. This book was released on 2003-07-10 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book, entitled Thin Films on Glass, is one of a series reporting on research and development activities on products and processes conducted by the Schott Group. The scientifically founded development of new products and technical pro cesses has traditionally been of vital importance to Schott and has always been performed on a scale determined by the prospects for application of our special glasses. Since the reconstruction of the Schott Glaswerke in Mainz, the scale has increased enormously. The range of expert knowledge required could never have been supplied by Schott alone. It is also a tradition in our company to cultivate collaboration with customers, universities, and research institutes. Publications in numerous technical journals, which since 1969 we have edited to a regular schedule as Forschungsberichte - 'research reports' - describe the results of these cooperations. They contain up-to-date infor mation on various topics for the expert but are not suited as survey material for those whose standpoint is more remote. This is the point where we would like to place our series, to stimulate the exchange of thoughts, so that we can consider from different points of view the possibilities offered by those incredibly versatile materials, glass and glass ceramics. We would like to share the knowledge won through our research and development at Schott in cooperation with the users of our materials with scientists and engineers, interested customers and friends, and with the employees of our firm.
Book Synopsis Growth, Optimisation and Characterisation of Pulsed Laser Deposited Nd-based High Temperature Superconducting Thin Films for Device Applications by : Ratnakar Palai
Download or read book Growth, Optimisation and Characterisation of Pulsed Laser Deposited Nd-based High Temperature Superconducting Thin Films for Device Applications written by Ratnakar Palai and published by . This book was released on 2004 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pulsed Laser Deposition of Eu-doped Multilayer Thin Films for Spectral Storage Applications by : Francisco Javier Bezares
Download or read book Pulsed Laser Deposition of Eu-doped Multilayer Thin Films for Spectral Storage Applications written by Francisco Javier Bezares and published by . This book was released on 2010 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis studies different Eu optical centers in MgS:Eu and CaS:Eu thin films produced by Chemically Controlled Pulse Laser Deposition (CCPLD) and evaluates their suitability for the development of spectral storage devices of the future. The produced thin films consist of one or more optically active layer(s), MgS:Eu, CaS:Eu or a similar material, and a corresponding ZnS capping layer that functions as a protecting barrier for the other layers and preserves their composition and integrity. Given that the synthesis of the materials used to produce the multilayer structures in this work proved a great challenge, careful attention was given to the optimization of all fabrication parameters. Mass Spectrometry was used during the deposition of the thin films and the data obtained resulted on improvements and optimization of the deposition process. Scanning electron microscopy studies of these thin films were conducted to study degradation upon long-term storage. Microscopy results show that the morphology of the produced thin films is correlated to the growth environment during deposition and deterioration of the deposited materials could be initiated by nano-gaps and cracks in the capping layer of the thin films. In addition to optical centers in MgS:Eu and CaS:Eu, new centers were created by changing the thin film growth environment inside a hi-vacuum chamber, modifying the composition of the ablation target material, or both. For example, introducing O2, or alternatively HCl, inside the CCPLD chamber while producing MgS:Eu thin films results in the formation of impurity associated centers across lattice sites throughout the deposited structures. In another method of impurity doping studied, Cl- and Na+ were introduced into the MgS:Eu and CaS:Eu lattices by mixing trace amounts of the impurity ions into these materials in polycrystalline form and making this mixture a deposition target by hi-pressure cold compression technique. The introduction of these impurity ions will alter the crystal field environment around the Eu ions thus creating new optical centers with a shift in energy of their characteristic Zero Phonon Line. After extensive characterization of the optical properties of the thin films produced, laser-induced fluorescence spectroscopy and absorption spectroscopy measurements confirm that they are suitable candidates to be used in conjunction with power-gated spectral holeburning technique and could potentially provide ultrahigh, terabits per square inch, storage densities.
Book Synopsis Oxidation of Tungsten by : Vincent David Barth
Download or read book Oxidation of Tungsten written by Vincent David Barth and published by . This book was released on 1961 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report presents a detailed review of available information on the oxidation of W and its alloys. W is relatively inert below 700 C. As the temperature is increased above this level, however, oxidation becomes progressively more rapid, reaching catastrophic rates at temperatures around 1200 C and above. Various theories for the mechanism and rates of W oxidation at different temperatures are reviewed, and the effect of pressure and water vapor on the stability of W oxides is discussed in detail. The elevatedtemperature reactions of W with other materials, such as refractory oxides, and with gases other than oxygen also are covered. Information on the protection of W by alloying and coating is included. (Author).
Book Synopsis Comparative Characterization of Molybdenum Oxide Thin Films Grown on Various Substrates Using Temporally Different Pulsed Laser Deposition Techniques by : Krishna Harsha Puppala
Download or read book Comparative Characterization of Molybdenum Oxide Thin Films Grown on Various Substrates Using Temporally Different Pulsed Laser Deposition Techniques written by Krishna Harsha Puppala and published by . This book was released on 2016 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pulsed Laser Deposition (PLD) technique, with its vast tunability in terms of thin film fabrication has been the center of this study. By changing the temporal component of the laser source used for deposition into the femtosecond (fs) regime, interesting structural, morphological changes can be achieved which may prove to be beneficial for photocatalytic applications. In particular, molybdenum oxide thin films, which are the less well-studied and potentially newer candidates for photocatalysis applications have been chosen for investigation. Hence, a detailed characterization study of molybdenum oxide thin films synthesized using femtosecond-based (f-PLD) and nanosecond-based (n-PLD) techniques, was carried out in terms of their structural, morphological, surface chemical/ electronic states and vibrational properties using X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy and Raman spectroscopy. The f-PLD technique was found to produce more favorable molybdenum oxide thin films deposited on glass for surface-related applications, in terms of having a higher surface to volume ratio, than the n-PLD technique. A related simultaneous study of substrate-based effect on the thin films produced using n-PLD system, also revealed both variation among the morphological, structural, and electronic (in terms of Mo oxidation state) properties depending upon the nature of the substrate used to synthesize the molybdenum oxide thin films. Special cases of thin films on epitaxial substrates (Si, sapphire) have been characterized to determine the parameters necessary for fabricating highly-textured thin films with large surface-area to volume ratio, which is key to efficient photo-catalysts.
Book Synopsis Ferroelectric Thin Films Prepared by Pulsed Laser Deposition Processing and Characterization by : L. P. Cook
Download or read book Ferroelectric Thin Films Prepared by Pulsed Laser Deposition Processing and Characterization written by L. P. Cook and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Preliminary Investigations on Tungsten Oxide Thin Films by : M. C. Rao
Download or read book Preliminary Investigations on Tungsten Oxide Thin Films written by M. C. Rao and published by LAP Lambert Academic Publishing. This book was released on 2011-08 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: The energy conversion, storage and distribution are the important concerns of our civilization in order to meet the challenges of global warming and finite nature of the fossil fuels. In response to the needs of the modern society and emerging technological advancements, it is now essential that new, low cost and environment friendly energy conversion and storage systems are to be developed. As the general tendency of all advanced technologies is towards miniaturization, it is evident that the future development of batteries is aimed at smaller dimensions with higher-energy densities. The development of solid-state batteries parallels the development of semiconductor electronics. Systematic and detailed investigations were made on the growth and characterization of tungsten oxide thin films considering the importance of these films in the fabrication of all solid state microbattery application.
Book Synopsis Electrochromic Nickel-tungsten Oxides by :
Download or read book Electrochromic Nickel-tungsten Oxides written by and published by . This book was released on 2012 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pulsed Laser Deposition and Characterization of High T C YBa 2Cu 3O 7-x Superconductung Thin Films by : Rajiv K. Singh
Download or read book Pulsed Laser Deposition and Characterization of High T C YBa 2Cu 3O 7-x Superconductung Thin Films written by Rajiv K. Singh and published by . This book was released on 1998 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Growth and Characterization of Cobalt Doped Indium Oxide Thin Films by : Naveen Kumar Mamidi
Download or read book Growth and Characterization of Cobalt Doped Indium Oxide Thin Films written by Naveen Kumar Mamidi and published by . This book was released on 2007 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
