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Download or read book Controlling the Electronic Structure in II-VI Core-shell Nanocrystal Quantum Dots Toward Tuned Optical Properties written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Xin Tong
Publisher : Springer Nature
ISBN 13 : 3030465969
Total Pages : 331 pages
Book Rating : 4.0/5 (34 download)
Download or read book Core/Shell Quantum Dots written by Xin Tong and published by Springer Nature. This book was released on 2020-07-01 with total page 331 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book outlines various synthetic approaches, tuneable physical properties, and device applications of core/shell quantum dots (QDs). Core/shell QDs have exhibited enhanced quantum yield (QY), suppressed photobleaching/blinking, and significantly improved photochemical/physical stability as compared to conventional bare QDs. The core-shell structure also promotes the easy tuning of QDs’ band structure, leading to their employment as attractive building blocks in various optoelectronic devices. The main objective of this book is to create a platform for knowledge sharing and dissemination of the latest advances in novel areas of core/shell QDs and relevant devices, and to provide a comprehensive introduction and directions for further research in this growing area of nanomaterials research.
Author : Victor I. Klimov
Publisher : CRC Press
ISBN 13 : 1420079271
Total Pages : 485 pages
Book Rating : 4.4/5 (2 download)
Download or read book Nanocrystal Quantum Dots written by Victor I. Klimov and published by CRC Press. This book was released on 2017-12-19 with total page 485 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 : Andrey Rogach
Publisher : Springer Science & Business Media
ISBN 13 : 3211752374
Total Pages : 374 pages
Book Rating : 4.2/5 (117 download)
Download or read book Semiconductor Nanocrystal Quantum Dots written by Andrey Rogach and published by Springer Science & Business Media. This book was released on 2008-09-02 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 : Joachim Piprek
Publisher : CRC Press
ISBN 13 : 149874947X
Total Pages : 835 pages
Book Rating : 4.4/5 (987 download)
Download or read book Handbook of Optoelectronic Device Modeling and Simulation written by Joachim Piprek and published by CRC Press. This book was released on 2017-10-10 with total page 835 pages. Available in PDF, EPUB and Kindle. Book excerpt: • Provides a comprehensive survey of fundamental concepts and methods for optoelectronic device modeling and simulation. • Gives a broad overview of concepts with concise explanations illustrated by real results. • Compares different levels of modeling, from simple analytical models to complex numerical models. • Discusses practical methods of model validation. • Includes an overview of numerical techniques.
Author : Tuan Anh Nguyen
Publisher :
ISBN 13 :
Total Pages : 218 pages
Book Rating : 4.:/5 (78 download)
Download or read book Investigations of Electronic Structure and Optical Properties of Ii-Vi Self-assembled Quantum Dots written by Tuan Anh Nguyen and published by . This book was released on 2006 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this dissertation, we use different optical and imaging spectroscopy techniques to study electronic structure and optical properties of CdTe/ZnTe and CdSe/ZnSe self-assembled quantum dots (SAQDs). We perform single dot photoluminescence excitation experiments to identify carrier excitation mechanisms in CdTe/ZnTe QDs. The first mechanism is direct excitation into the QD excited states followed by relaxation to the ground state and the second mechanism is direct excitation into the QD ground states through LO phonon-assisted absorption. We then execute resonant PL measurements for both CdTe and CdSe QD ensembles to study the dependence of exciton-LO phonon coupling on QD size in these II-VI SAQDs. We shown that the strength of exciton-LO phonon coupling increases significantly for QDs with lateral sizes smaller than the exciton Bohr radius (e.g. as-grown CdTe QDs) while for larger QDs (e.g. CdSe or CdTe annealed) it is almost independent of the QD emission energy, and therefore presumably of the QD size. In order to study electronic coupling between SAQDs, we setup imaging experiments with the use of a hemisphere solid immersion lens. While the PLE imaging measurements show the existence two-dimensional platelets with a typical size of about 500 nm which provide spatially extended but strong localized states through which different QDs could be populated simultaneously, the spatially resolved imaging data demonstrates a complete 2D map of those platelets. These results are further supported by computational calculations based on finite element analysis. Low temperature exciton spin relaxation in symmetric CdTe SAQDs has been thoroughly studied by means of cw polarized magneto-PL and polarized time-resolved PL spectroscopies. We find that the degeneracy of exciton energy levels has a strong influence on the spin transition. When the exciton spin states in QDs are degenerate, the spin relaxation time is much shorter than the exciton recombination time. In contrast, if this degeneracy is removed, either by asymmetry or an external magnetic field, the spin relaxation time becomes much longer than the exciton recombination time. Using simple rate equation models, we estimate exciton spin relaxation times equal to 4.8 ns and 50 ps for non-degenerate and degenerate QD states, respectively.
Author : Gerasimos Konstantatos
Publisher : Cambridge University Press
ISBN 13 : 0521198267
Total Pages : 329 pages
Book Rating : 4.5/5 (211 download)
Download or read book Colloidal Quantum Dot Optoelectronics and Photovoltaics written by Gerasimos Konstantatos and published by Cambridge University Press. This book was released on 2013-11-07 with total page 329 pages. Available in PDF, EPUB and Kindle. Book excerpt: Captures the most up-to-date research in the field, written in an accessible style by the world's leading experts.
Author : Inuk Kang
Publisher :
ISBN 13 :
Total Pages : 260 pages
Book Rating : 4.E/5 ( download)
Download or read book Electronic Structure and Optical Properties of Lead Sulphide and Lead Selenide Nanocrystal Quantum Dots written by Inuk Kang and published by . This book was released on 1998 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Sergio Ivan Carrillo Guerrero
Publisher :
ISBN 13 :
Total Pages : 73 pages
Book Rating : 4.:/5 (867 download)
Download or read book Electronic Structure and Optical Properties of Heterogeneous Nanocrystals written by Sergio Ivan Carrillo Guerrero and published by . This book was released on 2012 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main objective of this work is to give a description of the electronic structure and optical properties of semiconductor quantum dots (nanocrystals) containing heterojunctions, i.e. nano-junctions between two semiconductors. These nanostructures have interesting optical properties which are very promising for applications in photonics and photovoltaics. The theoretical description of the effects of the interface demands special attention. We start describing the calculations of the electronic structure of bulk semiconductors using semi-empirical tight-binding, and we show how to apply this technique to semiconductor quantum dots. We develop expressions to connect the discrete levels of energy in a quantum dot and the transitions in optical absorption spectra. The bulk tight-binding parameters are used for the calculation of the electronic structure of quantum dots of single compounds, analyzing the effect of the size variation of the quantum dots. The effectiveness of this method is demonstrated, in particular we obtain good values for the bandgap versus size compared to experiments. We apply this method to calculate the electronic structure of PbSe/CdSe core/shell quantum dots, after an analysis of the different types of interfaces that can appear in this system, and we discuss the issues related to the determination of the band offsets. The results of these calculations validate the assumption of the role of the shell as a potential barrier for the electron and the hole. The electronic structures are used in the last chapter to simulate the absorption spectra of PbSe, CdSe and PbSe/CdSe quantum dots. We give theoretical support to recent experiments in transient absorption spectroscopy, revealing groups of new transitions originated by photo-induced intraband absorption. Our calculations shed light on the nature of these optical transitions which can be of interest for applications in photonics.
Author : Tabrej Khan
Publisher : Springer Nature
ISBN 13 : 9819941490
Total Pages : 310 pages
Book Rating : 4.8/5 (199 download)
Download or read book Nanomaterials: The Building Blocks of Modern Technology written by Tabrej Khan and published by Springer Nature. This book was released on 2023-08-27 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a general overview of different classes of nanomaterials, which includes the synthesis, fabrication, characterization, properties and technological applications of these materials. The book covers 4 main types of nanomaterials, namely: A) soft nanomaterials, B) biological nanomaterials, C) composite nanomaterials and D) green nanomaterials, where for each nanomaterials, a complete guide to material synthesis, characterization, their unique properties (as compared to a conventional bulk material) and potential technological applications is presented. One of the book's most notable characteristics is the inclusion of a section, a special focus on the future of nanomaterials for next-generation technology in electronic, power and energy devices. The content of this book is presented in a simple and lucid style which can also be used by professionals, scientists and students who are interested in the general research area of nanomaterials technology.
Author : John Donegan
Publisher : CRC Press
ISBN 13 : 9814316059
Total Pages : 250 pages
Book Rating : 4.8/5 (143 download)
Download or read book Cadmium Telluride Quantum Dots written by John Donegan and published by CRC Press. This book was released on 2013-12-03 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the last two decades, semiconductor quantum dots—small colloidal nanoparticles—have garnered a great deal of scientific interest because of their unique properties. Among nanomaterials, CdTe holds special technological importance as the only known II–VI material that can form conventional p–n junctions. This makes CdTe very important for the development of novel optoelectronic devices such as light-emitting diodes, solar cells, and lasers. Moreover, the demand for water-compatible light emitters and the most common biological buffers give CdTe quantum dots fields a veritable edge in biolabeling and bioimaging. Cadmium Telluride Quantum Dots: Advances and Applications focuses on CdTe quantum dots and addresses their synthesis, assembly, optical properties, and applications in biology and medicine. It makes for a very informative reading for anyone involved in nanotechnology and will also benefit those scientists who are looking for a comprehensive account on the current state of quantum dot–related research.
Author : Mark Green
Publisher : Royal Society of Chemistry
ISBN 13 : 1782628355
Total Pages : 295 pages
Book Rating : 4.7/5 (826 download)
Download or read book Semiconductor Quantum Dots written by Mark Green and published by Royal Society of Chemistry. This book was released on 2014-07-01 with total page 295 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantum dots are nano-sized particles of semiconducting material, typically chalcogenides or phosphides of metals found across groups II to VI of the periodic table. Their small size causes them to exhibit unique optical and electrical properties which are now finding applications in electronics, optics and in the biological sciences. Synthesis of these materials began in the late 1980’s and this book gives a thorough background to the topic, referencing these early discoveries. Any rapidly-expanding field will contain vast amounts of publications, and this book presents a complete overview of the field, bringing together the most relevant and seminal aspects literature in an informed and succinct manner. The author has been an active participant in the field since its infancy in the mid 1990’s, and presents a unique handbook to the synthesis and application of this unique class of materials. Drawing on both his own experience and referencing the primary literature, Mark Green has prepared. Postgraduates and experienced researchers will benefit from the comprehensive nature of the book, as will manufacturers of quantum dots and those wishing to apply them.
Author : S. V. Gaponenko
Publisher : Cambridge University Press
ISBN 13 : 0521582415
Total Pages : 263 pages
Book Rating : 4.5/5 (215 download)
Download or read book Optical Properties of Semiconductor Nanocrystals written by S. V. Gaponenko and published by Cambridge University Press. This book was released on 1998-10-28 with total page 263 pages. Available in PDF, EPUB and Kindle. Book excerpt: Examines the optical properties of low-dimensional semiconductor structures, a hot research area - for graduate students and researchers.
Author : Oluwatobi Samuel Oluwafemi
Publisher : Woodhead Publishing
ISBN 13 : 0128183047
Total Pages : 282 pages
Book Rating : 4.1/5 (281 download)
Download or read book Ternary Quantum Dots written by Oluwatobi Samuel Oluwafemi and published by Woodhead Publishing. This book was released on 2021-07-02 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ternary Quantum Dots: Synthesis, Properties, and Applications reviews the latest advances in ternary (I-III-VI) chalcopyrite quantum dots (QDs), along with their synthesis, properties and applications. Sections address the fundamental key concepts of ternary quantum dots, progress in synthesis strategies (i.e., organic and aqueous synthesis), and characterization methods (i.e., transmission electron microscopy, dynamic light scattering, etc.). Properties of ternary quantum dots are comprehensively reviewed, including optical, chemical and physical properties. The factors and mechanisms of the cytotoxicity of ternary quantum dot-based nanomaterials are also described. Since ternary chalcopyrite quantum dots are less toxic and more environmentally benign than conventional binary II-VI chalcogenide quantum dots, they are being investigated to replace conventional quantum dots in a range of applications. Thus, this book reviews QDs in various applications, such as solar cells, photocatalytic, sensors and bio-applications. Reviews fundamental concepts of ternary quantum dots and quantum dot-nanocomposites including the most relevant synthesis strategies, key properties, and characterization techniques Delves into the cytotoxicity of quantum dots looking at the factors and mechanisms that influence cytotoxicity including demonstration of cytotoxicity assays for in vitro and in vivo tests Touches on the many applications of ternary quantum dots including biomedical applications, applications in solar cells, sensing applications, and photocatalytic applications
Author : Alberto Credi
Publisher : Springer
ISBN 13 : 3319511920
Total Pages : 179 pages
Book Rating : 4.3/5 (195 download)
Download or read book Photoactive Semiconductor Nanocrystal Quantum Dots written by Alberto Credi and published by Springer. This book was released on 2017-01-20 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: The series Topics in Current Chemistry Collections presents critical reviews from the journal Topics in Current Chemistry organized in topical volumes. The scope of coverage is all areas of chemical science including the interfaces with related disciplines such as biology, medicine and materials science. The goal of each thematic volume is to give the non-specialist reader, whether in academia or industry, a comprehensive insight into an area where new research is emerging which is of interest to a larger scientific audience. Each review within the volume critically surveys one aspect of that topic and places it within the context of the volume as a whole. The most significant developments of the last 5 to 10 years are presented using selected examples to illustrate the principles discussed. The coverage is not intended to be an exhaustive summary of the field or include large quantities of data, but should rather be conceptual, concentrating on the methodological thinking that will allow the non-specialist reader to understand the information presented. Contributions also offer an outlook on potential future developments in the field.
Author : Warren C.W. Chan
Publisher : Springer Science & Business Media
ISBN 13 : 0387767134
Total Pages : 223 pages
Book Rating : 4.3/5 (877 download)
Download or read book Bio-Applications of Nanoparticles written by Warren C.W. Chan and published by Springer Science & Business Media. This book was released on 2009-09-29 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt: This edited book highlights the central players in the Bionanotechnology field - which are the nanostructures and biomolecules. It provides broad examples of current developments in Bionanotechnology research and is an excellent introduction to the field. The book describes how nanostructures are synthesized and details the wide variety of nanostructures available for biological research and applications. Examples of the unique properties of nanostructures are provided along with the current applications of these nanostructures in biology and medicine. The final chapters of the book describe the toxicity of nanostructures.
Author : Nathan E. Stott
Publisher :
ISBN 13 :
Total Pages : 175 pages
Book Rating : 4.:/5 (591 download)
Download or read book Novel Synthetic Routes to High-quality II-VI Colloidal Nanocrystals written by Nathan E. Stott and published by . This book was released on 2004 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanometer-sized colloidal quantum dots, or nanocrystals, are of current scientific interest based on their mesoscopic properties as an intermediate state between molecular and bulk materials. Particles sizes of semiconductor materials smaller than the Bohr exciton radius result in a quantum confinement effect that allows the optical properties to be tuned within the band energies of the bulk material such that smaller sizes lead to higher energy transitions at the band edge. The small sizes and tunable monochromatic emission properties make these nanocrystals desirable for a variety of applications, both realized and sought after. Research to further the exploitation of quantum dots includes such applications as biological fluorescence tracer tags and imaging agents, high resolution displays, light emitting diodes (LEDs), low bandwidth lasers, photovoltaic solar cells, and future "nanoelectronics." The thesis of this dissertation is that high-quality II-VI colloidal nanocrystals, CdSe and (CdSe)ZnS in particular, can be synthesized using mild precursors, exerting fine control though the proper selection of ligands. Chapters 2 and 3 show that extremely high-quality CdSe nanocrystals can be synthesized using mild precursors such as Cd(acac)2 and Cd(OH)2 while achieving higher quantum efficiencies, higher reaction yields, smaller size-distributions, and with finer control over the final size in comparison to previous methods. In addition to the batch synthesis, Chapter 3 shows the development of a microfluidic flow reactor using a mixed highboiling STP liquid solvent. It is found that the temperature, flow rate, and precursor ratios are parameters that can be used to control the size and size-distributions of the final products. The CdSe cores are overcoated with ZnS from Zn(acac)2 to form highly stable and highly luminescent (core)shell colloids in Chapter 4. Chapter 5 develops qualitative arguments based on the Drago-Wayland extension of Hard-Soft Acid-Base Theory to describe the actions of surfactant ligands in the growth solution. It is shown that crystal growth inhibitors can be used to finely control nanocrystal growth, and the precursor-to-inhibitor ratio is fundamental to the final size.
