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Electronic Transport Phenomena In N Cds Single Crystals A Characterization Study Via A Combined Photoacoustic Spectroscopy And Photoconductivity Approach
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Book Synopsis Electronic Transport Phenomena in N-CdS Single Crystals: a Characterization Study Via a Combined Photoacoustic Spectroscopy and Photoconductivity Approach by : Edwin Kin-Man Siu
Download or read book Electronic Transport Phenomena in N-CdS Single Crystals: a Characterization Study Via a Combined Photoacoustic Spectroscopy and Photoconductivity Approach written by Edwin Kin-Man Siu and published by . This book was released on 1986 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ultrafast Optical and Electronic Characterization of (Cd,Mg)Te Single Crystals by : John R. Serafini
Download or read book Ultrafast Optical and Electronic Characterization of (Cd,Mg)Te Single Crystals written by John R. Serafini and published by . This book was released on 2017 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This thesis presents several projects devoted to the optical and electrical characterization of (Cd,Mg)Te crystals and their application as X-ray detectors. Throughout much of this work, a femtosecond pump-probe spectroscopy system was built in order to carry out these experiments. The thesis is organized into 7 chapters. The first chapter covers the current literature state-of-the art on experimental work performed to date on CMgT. In the second chapter, we present our experimental setup in detail, simultaneously reviewing operation of a femtosecond laser system and techniques of small signal detection. The next three chapters describe the studies performed for this thesis, starting with femtosecond pump-probe measurements of time-resolved nonequilibrium carrier dynamics. We pay close attention to the use of dopants and post-growth annealing and their impact on the relaxation dynamics. Analysis of the experimental data led to the development of a new relaxation model. This model provides a quantitative description of various relaxation processes and resolves the differences between deep and surface trap states. Next, the pump-probe setup is used to detect coherent acoustic phonons (CAPs) in an effort to observe their dynamics as well as determine the speed of sound through the crystal. The latter is achieved by tuning our laser from 750 up to 870 nm and measuring the CAP oscillation frequency. Finally, we present our studies on both photoconductive (PC) and electro-optic (EO) femtosecond (THz bandwidth) responses, of (Cd,Mg)Te single crystals. In an In-doped, Cd0.92Mg0.08Te crystal, subpicosecond electrical pulses were optically generated via a PC effect and subsequently detected in the same crystal using an EO sampling scheme. The above approach led to a new "experimental-on-chip" concept. By measuring the transient waveforms at different distances from the excitation point, we calculated the transmission-line complex propagation factor and then reconstructed the electromagnetic transient generated directly at the excitation point, showing that the original PC transient was subpicosecond in duration with a fall time of 500 fs. The measured EO retardation, together with the amount of the electric-field attenuation, allowed us to determine the magnitude of the internal EO effect in our (Cd,Mg)Te crystal. The obtained THz-frequency EO coefficient r41 was equal to 0.4 pm/V, which is at the lower end among the different values reported for CdTe-based ternaries; apparently, due to a twinned structure of the tested (Cd,Mg)Te crystal. Chapter 6 reports on the practical implementation of (Cd,Mg)Te photoconductive devices as a diagnostic X-ray detection tool in the multi-terawatt (MTW) laser facility at the University of Rochester’s Laboratory for Laser Energetics. In addition to efficiently measuring high energy X-rays, we also detected high energy protons emitted from the target. Our X-ray studies show that with some further refinement of our crystalline structure, (Cd,Mg)Te detectors are viable devices for time-resolved measurements of X-rays emitted by very broadband sources, such as OMEGA targets in inertial confinement fusion experiments."--Pages x-xii.
Book Synopsis A Study of Charge Transport Phenomena and Nanoscale Investigation of the Modified CdS Surface by : Ivan Dolog
Download or read book A Study of Charge Transport Phenomena and Nanoscale Investigation of the Modified CdS Surface written by Ivan Dolog and published by . This book was released on 2009 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The adsorption of 7-ethynyl-2,4,9-trithia-tricyclo[3.3.1.13,7]decane (7ETTD), polyaniline (PANI), triethoxysilane (TES), and poly(methyl methacrylate) (PMMA) on ultrathin sputtered amorphous CdS films has been investigated using inelastic electron tunneling spectroscopy (IETS), in conjunction with multiple reflection adsorption IR spectroscopy. Conductance-voltage data are recorded for tunnel junctions of the type Al/CdS/7ETTD/Pb over a temperature range of 4K to room temperature and they indicate that the presence of the adsorbed 7ETTD layer on the CdS dramatically modifies the conductance-voltage behavior of the junctions. These measurements show that different conduction mechanisms, including tunneling and possibly hopping, are responsible for charge transfer through the junctions depending on current, temperature, and voltage. WKB fits to the data are used to determine tunnel barrier parameters (height and width) for Al/CdS/Pb junctions with and without adsorbed 7ETTD layers on the CdS. Analysis of the fits shows that tunneling occurs at low bias (less than ~0.2 V) but, at higher bias voltages, modification of the barrier parameters alone is insufficient to account for the observed conductance changes. A frontier orbital model is invoked which does offer a plausible explanation for these conductance changes. The model assumes bias-dependent coupling between HOMO and LUMO states of the adsorbed 7ETTD and surface states on the CdS. The present work suggests that, because of the marked effect on the conductance iv of CdS ultra-thin films, 7ETTD and other similar compounds may be candidates for use in molecular electronic device fabrication. It was found that PANI and TES do not adsorb strongly on amorphous CdS but can be used to modify conductance-voltage behavior. On the other hand, PMMA adsorbs strongly and shows promise as a material for use as a host matrix, in photovoltaic applications. Preliminary work is presented in which CdS nanoparticles size is estimated using surface enhanced Raman spectroscopy and Atomic Force Microscopy, and it has been determined that IETS and conductance-voltage measurement could be extended for the investigation of he CdS nanoparticles electronic properties. Further investigations into the surface properties of CdS are presented. Specifically, a robust technique, based on vertical, "z-lift", manipulation of a negatively biased oscillating atomic force microscope tip, is extended to CdS and used to create raised columnar nanostructures with high aspect ratios (up to 40 nm high/150 nm wide) on amorphous CdS thin films. The nanostructures' height 8-40 nm can be controlled and correlates with CdS film thickness. An in-house modified electric force microscope is used to record the associated surface charge distribution in the proximity of the nanostructures which is found to be opposite to that of the tip."--Abstract.
Download or read book Physics Briefs written by and published by . This book was released on 1992 with total page 1332 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Electrical Phenomena in the Pre-breakdown Region of CdS Crystals by : Nouriddin Abdulla al-Rubayi
Download or read book Electrical Phenomena in the Pre-breakdown Region of CdS Crystals written by Nouriddin Abdulla al-Rubayi and published by . This book was released on 1956 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ceramic Abstracts written by and published by . This book was released on 1994 with total page 972 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 602 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.
Book Synopsis Ultrafast Time-resolved Characterization of (Cd,Mn)Te Semiconductors as Radiation Detectors by : Allen S. Cross
Download or read book Ultrafast Time-resolved Characterization of (Cd,Mn)Te Semiconductors as Radiation Detectors written by Allen S. Cross and published by . This book was released on 2011 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This thesis is devoted to the optical characterization of Cd1-xMnxTe [(Cd,Mn)Te] semiconductor based radiation detectors. In it I present my research on the study of (Cd,Mn)Te single crystal as both a material for detection of high-energy x rays as well as for sub-picosecond voltage sensing. The work includes the practical implementation of (Cd,Mn)Te, its characterization using ultrafast spectroscopy, and comparative measurements to other competitive materials. Characterization of the voltage sensitivity of (Cd,Mn)Te is accomplished using time-resolved spectroscopy and sub-picosecond electro-magnetic pulses. My research shows that the electro-optic (EO) effect of (Cd,Mn)Te is nearly an order of magnitude greater than previously believed, and accomplishes voltage sensitivities for THz signals greater than traditional EO transducers currently available. For measurements of low-frequency signals, the results agree with the unexceptionally low textbook value; however, through various experiments studying the EO dependence on temperature, fabrication technique, and frequency, I show that the culprit for the low sensitivity at low frequency is free-carrier screening. Furthermore, testing the wavelength dependence shows that the sensitivity is enhanced for optical probe energies approaching the crystal bandgap, which in of itself, is tunable in the visible to near infrared spectrum by changing the manganese concentration. Comparative measurements to LiTaO3 are made showing the same sub-picosecond temporal resolution, but significantly greater voltage sensitivity absent of dielectric loading. I further report on the implementation of (Cd,Mn)Te photoconductive devices (PCDs) as the diagnostics x-ray detection tool used for conducting inertial confinement fusion (ICF) experiments in the OMEGA Facility at the University of Rochester's Laboratory for Laser Energetics, and compare the results to those of standard diamond PCDs. I present measurements of the (Cd,Mn)Te PCDs, intended to characterize both the temporal and spectral dependence of x-ray emissions from laser-illuminated targets during ICF experiments. The Cd0.95Mn0.05Te single crystals, doped with vanadium and annealed in Cd vapor, exhibit resistivity of [...characters removed]. A 1-mm-long and 2.3-mm-long detector is placed in the same housing as a 1-mm-long diamond PCD. Each device is preceded by a Be x-ray filter with 37% x-ray transmission at the 1-keV cutoff energy. The energy of the incident OMEGA laser pulses vary from 2.3 kJ to 28 kJ. Using targets of empty plastic shells, we observe two x-ray emission events separated by 1.24 ns: the first event is caused by heating of the shell that created a hot corona, while the second event is an x-ray emission from the fully compressed target. ICF experiments of targets with steel cores enable the analysis of time-resolved relaxation dynamics of photo-excited carriers in the (Cd,Mn)Te crystals. According to my calculations, the (Cd,Mn)Te material can effectively absorb x rays with energies of up to 200 keV. Thus, the (Cd,Mn)Te PCDs are likely to complement the diamond detectors currently used in the laser-confinement fusion experiments."--Leaves v-vi.
Book Synopsis Photo-magnetic-electric Study of Cds Crystals. Transport Properties of Bismuth Rolled Thin Foils by : Andre Luyckx
Download or read book Photo-magnetic-electric Study of Cds Crystals. Transport Properties of Bismuth Rolled Thin Foils written by Andre Luyckx and published by . This book was released on 1964 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photo-magneto-electric phenomena in CdS single crystals are interpreted by photopolarization. High frequency forming of CdS is interpreted by solid reversible electrolysis. Photovoltages and adsorbed gases. Study of photocurrents induced by post-irradiation infrared quenching wavelengths. Transport properties of bismuth rolled thin foils at 80 and 295 K, resistivity, thermoelectric power, magnetoresistance, Hall constant, magneto-Seebeck coefficient, are compared with the similar properties of undeformed samples. (Author).
Book Synopsis Exciton Structure in Photoconductivity of CdS, CdSe and CdS:Se Single Crystals by : Yoon Soo Park
Download or read book Exciton Structure in Photoconductivity of CdS, CdSe and CdS:Se Single Crystals written by Yoon Soo Park and published by . This book was released on 1963 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Electrical & Electronics Abstracts by :
Download or read book Electrical & Electronics Abstracts written by and published by . This book was released on 1997 with total page 1904 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis International Aerospace Abstracts by :
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1986 with total page 918 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Engineering Index Annual written by and published by . This book was released on 1988 with total page 2282 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since its creation in 1884, Engineering Index has covered virtually every major engineering innovation from around the world. It serves as the historical record of virtually every major engineering innovation of the 20th century. Recent content is a vital resource for current awareness, new production information, technological forecasting and competitive intelligence. The world?s most comprehensive interdisciplinary engineering database, Engineering Index contains over 10.7 million records. Each year, over 500,000 new abstracts are added from over 5,000 scholarly journals, trade magazines, and conference proceedings. Coverage spans over 175 engineering disciplines from over 80 countries. Updated weekly.
Book Synopsis Principles and Applications of Nonlinear Optical Materials by : R.W. Munn
Download or read book Principles and Applications of Nonlinear Optical Materials written by R.W. Munn and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 265 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nonlinear optics is a topic of much current interest that exhibits a great diversity. Some publications on the subject are clearly physics, while others reveal an engineering bias; some appear to be accessible to the chemist, while others may appeal to biological understanding. Yet all purport to be non linear optics so where is the underlying unity? The answer is that the unity lies in the phenomena and the devices that exploit them, while the diversity lies in the materials used to express the phenomena. This book is an attempt to show this unity in diversity by bringing together contributions covering an unusually wide range of materials, preceded by accounts of the main phenomena and important devices. Because ofthe diversity, individual materials are treated in separate chapters by different expert authors, while as editors we have shouldered the task of providing the unifying initial chapters. Most main classes of nonlinear optical solids are treated: semiconductors, glasses, ferroelectrics, molecular crystals, polymers, and Langmuir-Blodgett films. (However, liquid crystals are not covered. ) Each class of material is enough for a monograph in itself, and this book is designed to be an introduction suitable for graduate students and those in industry entering the area of nonlinear optics. It is also suitable in parts for final-year undergraduates on project work. It aims to provide a bridge between traditional fields of expertise and the broader field of nonlinear optics.
Book Synopsis Electron Transport in Quantum Dots by : Jonathan P. Bird
Download or read book Electron Transport in Quantum Dots written by Jonathan P. Bird and published by Springer Science & Business Media. This book was released on 2013-11-27 with total page 481 pages. Available in PDF, EPUB and Kindle. Book excerpt: When I was contacted by Kluwer Academic Publishers in the Fall of 200 I, inviting me to edit a volume of papers on the issue of electron transport in quantum dots, I was excited by what I saw as an ideal opportunity to provide an overview of a field of research that has made significant contributions in recent years, both to our understanding of fundamental physics, and to the development of novel nanoelectronic technologies. The need for such a volume seemed to be made more pressing by the fact that few comprehensive reviews of this topic have appeared in the literature, in spite of the vast activity in this area over the course of the last decade or so. With this motivation, I set out to try to compile a volume that would fairly reflect the wide range of opinions that has emerged in the study of electron transport in quantum dots. Indeed, there has been no effort on my part to ensure any consistency between the different chapters, since I would prefer that this volume instead serve as a useful forum for the debate of critical issues in this still developing field. In this matter, I have been assisted greatly by the excellent series of articles provided by the different authors, who are widely recognized as some of the leaders in this vital area of research.
Book Synopsis Heterogeneous Photocatalysis by : M. Schiavello
Download or read book Heterogeneous Photocatalysis written by M. Schiavello and published by . This book was released on 1997-10-09 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photocatalysis is a reaction which is accelerated by light while a heterogeneous reaction consists of two phases ( a solid and a liquid for example). Heterogeneous Photocatalysis is a fast developing science which to date has not been fully detailed in a monograph. This title discusses the basic principles of heterogeneous photocatalysis and describes the bulk and surface properties of semiconductors. Applications of various types of photoreactions are described and the problems related to the modeling and design of photoreactors are covered.
Book Synopsis Metal Nanoparticles in Microbiology by : Mahendra Rai
Download or read book Metal Nanoparticles in Microbiology written by Mahendra Rai and published by Springer Science & Business Media. This book was released on 2011-04-02 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: Following an introduction to biogenic metal nanoparticles, this book presents how they can be biosynthesized using bacteria, fungi and yeast, as well as their potential applications in biomedicine. It is shown that the synthesis of nanoparticles using microbes is eco-friendly and results in reproducible metal nanoparticles of well-defined sizes, shapes and structures. This biotechnological approach based on the process of biomineralization exploits the effectiveness and flexibility of biological systems. Chapters include practical protocols for microbial synthesis of nanoparticles and microbial screening methods for isolating a specific nanoparticle producer as well as reviews on process optimization, industrial scale production, biomolecule-nanoparticle interactions, magnetosomes, silver nanoparticles and their numerous applications in medicine, and the application of gold nanoparticles in developing sensitive biosensors.
