Magneto-optical Properties of II-VI Semiconductor Colloidal Nanostructure PDF Download

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Languages : en
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Author: Feng Liu
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Languages : en
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Author: Imran Khan
Publisher:
ISBN:
Category :
Languages : en
Pages : 94

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In this thesis we describe magneto-optical studies of three semiconductor heterostructures. In the first study we have recorded the electroluminescence (EL) from Fe spin light emitting diodes (spin-LEDs) in which the intrinsic wide GaAs quantum well (QW) is populated by holes. The emission characteristics from this system is compared with those from Fe spin-LEDs in which the GaAs QW is populated by electrons, studied earlier. In the second project we have studied the magneto-EL spectra from a LED in which the GaAs quantum wells in the intrinsic region of the device are populated by a dense two-dimensional electron gas. This experiment yielded spin splittings of the h1 valence sub-band Landau levels. The third project involved a magneto-photoluminencence (PL) study of ZnMnTe quantum dots (QDs) embedded in a ZnSe matrix. This system shows evidence of the spontaneous formation of a polaron. At low temperatures the polaron consists of an electron in the ZnSe matrix, a hole and a Mn ion in the ZnMnTe QD. The emission at low temperatures is strongly circularly polarized(sigma+ or sigma- ). As the temperature is raised the polarization drops to zero. This is interpreted as due a breakdown of the e-h-Mn polaron into an electron and a h-Mn polaron that persists up to room temperature. Aharonov-Bohm oscillations in the PL intensity have been observed in this system.

Author: Alexander L. Efros
Publisher: Springer Science & Business Media
ISBN: 1475736770
Category : Technology & Engineering
Languages : en
Pages : 277

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A physics book that covers the optical properties of quantum-confined semiconductor nanostructures from both the theoretical and experimental points of view together with technological applications. Topics to be reviewed include quantum confinement effects in semiconductors, optical adsorption and emission properties of group IV, III-V, II-VI semiconductors, deep-etched and self assembled quantum dots, nanoclusters, and laser applications in optoelectronics.

Author: Victor I. Klimov
Publisher: CRC Press
ISBN: 1351834525
Category : Technology & Engineering
Languages : en
Pages : 584

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A review of recent advancements in colloidal nanocrystals and quantum-confined nanostructures, Nanocrystal Quantum Dots is the second edition of Semiconductor and Metal Nanocrystals: Synthesis and Electronic and Optical Properties, originally published in 2003. This new title reflects the book’s altered focus on semiconductor nanocrystals. Gathering contributions from leading researchers, this book contains new chapters on carrier multiplication (generation of multiexcitons by single photons), doping of semiconductor nanocrystals, and applications of nanocrystals in biology. Other updates include: New insights regarding the underlying mechanisms supporting colloidal nanocrystal growth A revised general overview of multiexciton phenomena, including spectral and dynamical signatures of multiexcitons in transient absorption and photoluminescence Analysis of nanocrystal-specific features of multiexciton recombination A review of the status of new field of carrier multiplication Expanded coverage of theory, covering the regime of high-charge densities New results on quantum dots of lead chalcogenides, with a focus studies of carrier multiplication and the latest results regarding Schottky junction solar cells Presents useful examples to illustrate applications of nanocrystals in biological labeling, imaging, and diagnostics The book also includes a review of recent progress made in biological applications of colloidal nanocrystals, as well as a comparative analysis of the advantages and limitations of techniques for preparing biocompatible quantum dots. The authors summarize the latest developments in the synthesis and understanding of magnetically doped semiconductor nanocrystals, and they present a detailed discussion of issues related to the synthesis, magneto-optics, and photoluminescence of doped colloidal nanocrystals as well. A valuable addition to the pantheon of literature in the field of nanoscience, this book presents pioneering research from experts whose work has led to the numerous advances of the past several years.

Author: Pamela Rueda-Fonseca
Publisher:
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Category :
Languages : en
Pages : 0

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In this PhD work a novel type of magnetic semiconductor object has been developed: Cd(Mn)Te quantum dots embedded in ZnTe/ZnMgTe core-shell nanowires. The goal was to investigate the growth, by molecular beam epitaxy, and the fundamental properties of these complex heterostructures. For that purpose, two main issues were addressed: i) gaining control of the structural, electronic and magnetic properties of these quantum objects by mastering their growth; and ii) obtaining quantitative local knowledge on the chemical composition of those non-homogeneous nanostructures. To tackle these topics, our research was divided into four stages. The first stage was devoted to perform a quantitative study of the formation process of the Au particles that catalyze the growth of nanowires. The second stage involved the analysis of the mechanisms and parameters governing the growth of ZnTe nanowires. In particular, two different types of nanowires were found: cone-shaped nanowires with the zinc-blende crystal structure and cylinder-shaped nanowires with the hexagonal wurtzite structure. A diffusion-driven growth model is employed to fit some of the quantitative results presented in this part. The third stage focused on the insertion of pure CdTe quantum dots containing Mn ions in the core-shell nanowires. An initial study of the relevant parameters influencing the magneto-optical properties of these objects, such as the quantum dot confinement, the Mn incorporation, and the strain anisotropy, was performed. The four and last stage of this work concerned the quantitative interpretation of Energy-Dispersive X-ray spectroscopy measurements performed on single core-multishell nanowires. A geometrical model was proposed to retrieve the shape, the size and the local composition of the quantum dot insertions and of the multiple layers of the heterostructures. This study was coupled to other complementary characterization measurements on the same nanowire, such as cathodo-luminescence, micro-photo-luminescence and magneto-optical spectroscopy.

Author: K. Byrappa
Publisher: William Andrew
ISBN: 1437778364
Category : Science
Languages : en
Pages : 796

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Quartz, zeolites, gemstones, perovskite type oxides, ferrite, carbon allotropes, complex coordinated compounds and many more -- all products now being produced using hydrothermal technology. Handbook of Hydrothermal Technology brings together the latest techniques in this rapidly advancing field in one exceptionally useful, long-needed volume.The handbook provides a single source for understanding how aqueous solvents or mineralizers work under temperature and pressure to dissolve and recrystallize normally insoluble materials, and decompose or recycle any waste material. The result, as the authors show in the book, is technologically the most efficient method in crystal growth, materials processing, and waste treatment. The book gives scientists and technologists an overview of the entire subject including: À Evolution of the technology from geology to widespread industrial use. À Descriptions of equipment used in the process and how it works.À Problems involved with the growth of crystals, processing of technological materials, environmental and safety issues.À Analysis of the direction of today's technology. In addition, readers get a close look at the hydrothermal synthesis of zeolites, fluorides, sulfides, tungstates, and molybdates, as well as native elements and simple oxides. Delving into the commercial production of various types, the authors clarify the effects of temperature, pressure, solvents, and various other chemical components on the hydrothermal processes. Gives an overview of the evolution of Hydrothermal Technology from geology to widespread industrial use Describes the equipment used in the process and how it works Discusses problems involved with the growth of crystals, processing of technological materials, and environmental and safety issues

Author: Alex Khammang
Publisher:
ISBN:
Category : Semiconductor nanocrystals
Languages : en
Pages : 228

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Author: Andrey Rogach
Publisher: Springer Science & Business Media
ISBN: 3211752374
Category : Technology & Engineering
Languages : en
Pages : 374

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This is the first book to specifically focus on semiconductor nanocrystals, and address their synthesis and assembly, optical properties and spectroscopy, and potential areas of nanocrystal-based devices. The enormous potential of nanoscience to impact on industrial output is now clear. Over the next two decades, much of the science will transfer into new products and processes. One emerging area where this challenge will be very successfully met is the field of semiconductor nanocrystals. Also known as colloidal quantum dots, their unique properties have attracted much attention in the last twenty years.

Author: Gerasimos Konstantatos
Publisher: Cambridge University Press
ISBN: 0521198267
Category : Science
Languages : en
Pages : 329

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Captures the most up-to-date research in the field, written in an accessible style by the world's leading experts.