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Author : Zhifeng Wei
Publisher :
ISBN 13 :
Total Pages : 274 pages
Book Rating : 4.:/5 (123 download)
Download or read book The Optical Response of Semiconductor Self-assembled Quantum Dots written by Zhifeng Wei and published by . This book was released on 2006 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Zhifeng Wei
Publisher : Open Dissertation Press
ISBN 13 : 9781374667525
Total Pages : pages
Book Rating : 4.6/5 (675 download)
Download or read book The Optical Response of Semiconductor Self-Assembled Quantum Dots written by Zhifeng Wei and published by Open Dissertation Press. This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "The Optical Response of Semiconductor Self-assembled Quantum Dots" by Zhifeng, Wei, 魏志鋒, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled THE OPTICAL RESPONSE OF SEMICONDUCTOR SELF-ASSEMBLED QUANTUM DOTS Submitted by Wei Zhifeng for the degree of Doctor of Philosophy at The University of Hong Kong in May 2006 Self-assembled quantum dots (QDs) are one type of tiny coherent islands which spontaneously form via the Stranski-Krastanow (S-K) growth mode during the heteroepitaxial growth of lattice-mismatched thin films. They have attracted considerable interest in recent years because of their atom-like properties and many potential applications in novel electronic and photonic devices. A detailed investigation on the optical properties of semiconductor QDs was presented in this thesis project. The variable-temperature photoluminescence (PL) spectra of two kinds of InGaAs QDs with and without a GaAs cap layer were comparatively investigated. It was found that the optical properties of the buried QDs with the cap layer differ significantly from those of the surface QDs. The growth of cap layer can improve the dots uniformity indicated by the narrow PL peak, greatly enhance the luminescence efficiency, and result in a large blueshift of the emission peak due to the strain environment change of the QDs. The cap layer also improves the thermal stability of the QD emission. The spontaneous emission mechanisms of two quaternary self-assembled GaInAsN QDs with different compositions and growth thicknesses have been studied. Adopting a newly developed localized-states luminescence model, the temperature behavior of the emissions from the two GaInAsN QDs has been quantitatively interpreted. The physical pictures of the spontaneous emissions of GaInAsN QDs were established. For the self-assembled QDs, a strained thin layer underneath the QDs always exists and this two-dimensional thin layer is called the wetting layer (WL). A quantitative study on the role of WL in the luminescence process of InAs/GaAs self- assembled QDs has been conducted. It has been shown that the WL acts as an efficient bridge not only in the relaxation of carriers from the barrier layer to the QDs but also in the thermal escaping of the carriers already captured by the QDs. Since the knowledge of electronic structure and optical transitions of self- assembled QDs is essentially important for the infrared detection applications of the QDs, a precise PL spectroscopic probe of the electronic structures of InAs/GaAs QDs with various silicon doping concentrations has been carried out. The theoretical predicted blueshift of the fundamental transitions of the QDs has been observed as the Si doping concentration and thus the number of electrons loaded into the dot is increased. It was also found that the Si δ-doping at the central regions of barrier layers during the growth of multi-layered QDs can significantly improve the luminescence efficiency of the samples at higher temperatures. Growth and optical characterizations of the electrically coupled InAs and InP QD stacking structures have been done. The study provides a possible way to produce a new type of broad-band QD light emitting diodes via the so-called band-engineering method. DOI: 10.5353/th_b3709820 Subjects: Quantum dots Semiconductors - Optical properties
Author :
Publisher : Academic Press
ISBN 13 : 0080864589
Total Pages : 385 pages
Book Rating : 4.0/5 (88 download)
Download or read book Self-Assembled InGaAs/GaAs Quantum Dots written by and published by Academic Press. This book was released on 1999-03-29 with total page 385 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume is concerned with the crystal growth, optical properties, and optical device application of the self-formed quantum dot, which is one of the major current subjects in the semiconductor research field.The atom-like density of states in quantum dots is expected to drastically improve semiconductor laser performance, and to develop new optical devices. However, since the first theoretical prediction for its great possibilities was presented in 1982, due to the difficulty of their fabrication process. Recently, the advent of self-organized quantum dots has made it possible to apply the results in important optical devices, and further progress is expected in the near future.The authors, working for Fujitsu Laboratories, are leading this quantum-dot research field. In this volume, they describe the state of the art in the entire field, with particular emphasis on practical applications.
Author : Y. Masumoto
Publisher : Springer Science & Business Media
ISBN 13 : 3662050013
Total Pages : 500 pages
Book Rating : 4.6/5 (62 download)
Download or read book Semiconductor Quantum Dots written by Y. Masumoto and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiconductor quantum dots represent one of the fields of solid state physics that have experienced the greatest progress in the last decade. Recent years have witnessed the discovery of many striking new aspects of the optical response and electronic transport phenomena. This book surveys this progress in the physics, optical spectroscopy and application-oriented research of semiconductor quantum dots. It focuses especially on excitons, multi-excitons, their dynamical relaxation behaviour and their interactions with the surroundings of a semiconductor quantum dot. Recent developments in fabrication techniques are reviewed and potential applications discussed. This book will serve not only as an introductory textbook for graduate students but also as a concise guide for active researchers.
Author : Zhiming M Wang
Publisher : Springer Science & Business Media
ISBN 13 : 0387741917
Total Pages : 470 pages
Book Rating : 4.3/5 (877 download)
Download or read book Self-Assembled Quantum Dots written by Zhiming M Wang and published by Springer Science & Business Media. This book was released on 2007-11-29 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt: This multidisciplinary book provides up-to-date coverage of carrier and spin dynamics and energy transfer and structural interaction among nanostructures. Coverage also includes current device applications such as quantum dot lasers and detectors, as well as future applications to quantum information processing. The book will serve as a reference for anyone working with or planning to work with quantum dots.
Author : Malte Huck
Publisher : diplom.de
ISBN 13 : 3836644398
Total Pages : 137 pages
Book Rating : 4.8/5 (366 download)
Download or read book Optical and Electrical Properties of Single Self-Assembled Quantum Dots in Lateral Electric Fields written by Malte Huck and published by diplom.de. This book was released on 2010-03-25 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt: Inhaltsangabe:Abstract: Chapter 1: In this thesis we investigate the optical properties of self-assembled quantum dots exposed to a lateral electric field. As a result of the electric field the wave functions of electrons and holes inside the quantum dot are manipulated, which makes it possible to tune their energy levels and control the optical properties of the system. The possibility of tuning the emission energy of different few particle states using this method makes this system very promising for the use of a source of polarization entangled photons as discussed in the following sections. In Section 1.1 the concept of entangled states is introduced together with a brief historical overview. The possibility of using the exciton biexciton cascade of a self-assembled quantum dot for the generation of entangled photon pairs is presented in Section 1.2. Chapter 2: In this chapter we introduce the concept of quantum dots and demonstrate their optical emission properties. In Section 2.1 the quantum dot is introduced as a three-dimensional charge carrier trap. Several types of quantum dots are presented in an overview. In Section 2.2 we discuss the physical effects that occur on the way from bulk semiconductor material to the three-dimensional charge carrier confinement in the case of quantum dots. The growth of self-assembled quantum dot samples is the topic of Section 2.3, where the technique of molecular beam epitaxy is introduced (Section 2.3.1). This technique is used to grow the semiconductor quantum dots via heteroepitaxy in the Stranski-Krastanov growth mode (Section 2.3.2). Quantum dots are commonly referred to as artificial atoms due to their atomlike emission features. The origin for this expression is explained in Section 2.4 on the basis of the energetic structure of self-assembled quantum dots. The optical properties of quantum dots are discussed in Section 2.5, beginning with an introduction to the experimental setup that has been used to investigate the quantum dots during this thesis (Section 2.5.1). Different optical excitation modes are presented in Section 2.5.2 and in Section 2.5.3 we discuss, how to achieve a low enough quantum dot density on the analyzed samples. Section 2.5.4 deals with the photoluminescence of different exciton states and in Section 2.5.5 we present how these lines can be identified via power dependent measurements. Finally, the concept of initial charges in self-assembled quantum dots is presented in [...]
Author : Robson Ferreira
Publisher : Morgan & Claypool Publishers
ISBN 13 : 1681741539
Total Pages : 148 pages
Book Rating : 4.6/5 (817 download)
Download or read book Capture and Relaxation in Self-Assembled Semiconductor Quantum Dots written by Robson Ferreira and published by Morgan & Claypool Publishers. This book was released on 2016-02-23 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is an overview of different models and mechanisms developed to describe the capture and relaxation of carriers in quantum-dot systems. Despite their undisputed importance, the mechanisms leading to population and energy exchanges between a quantum dot and its environment are not yet fully understood. The authors develop a first-order approach to such effects, using elementary quantum mechanics and an introduction to the physics of semiconductors. The book results from a series of lectures given by the authors at the Master’s level.
Author :
Publisher : Academic Press
ISBN 13 : 9780127521695
Total Pages : 368 pages
Book Rating : 4.5/5 (216 download)
Download or read book Self-Assembled InGaAs/GaAs Quantum Dots written by and published by Academic Press. This book was released on 1999-04-05 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume is concerned with the crystal growth, optical properties, and optical device application of the self-formed quantum dot, which is one of the major current subjects in the semiconductor research field. The atom-like density of states in quantum dots is expected to drastically improve semiconductor laser performance, and to develop new optical devices. However, since the first theoretical prediction for its great possibilities was presented in 1982, due to the difficulty of their fabrication process. Recently, the advent of self-organized quantum dots has made it possible to apply the results in important optical devices, and further progress is expected in the near future. The authors, working for Fujitsu Laboratories, are leading this quantum-dot research field. In this volume, they describe the state of the art in the entire field, with particular emphasis on practical applications.
Author : Ameenah Al-Ahmadi
Publisher : BoD – Books on Demand
ISBN 13 : 9535106481
Total Pages : 482 pages
Book Rating : 4.5/5 (351 download)
Download or read book Fingerprints in the Optical and Transport Properties of Quantum Dots written by Ameenah Al-Ahmadi and published by BoD – Books on Demand. This book was released on 2012-06-13 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book "Fingerprints in the optical and transport properties of quantum dots" provides novel and efficient methods for the calculation and investigating of the optical and transport properties of quantum dot systems. This book is divided into two sections. In section 1 includes ten chapters where novel optical properties are discussed. In section 2 involve eight chapters that investigate and model the most important effects of transport and electronics properties of quantum dot systems This is a collaborative book sharing and providing fundamental research such as the one conducted in Physics, Chemistry, Material Science, with a base text that could serve as a reference in research by presenting up-to-date research work on the field of quantum dot systems.
Author : Chulsoo Kim
Publisher :
ISBN 13 :
Total Pages : 232 pages
Book Rating : 4.:/5 (448 download)
Download or read book Fabrication, Structural, and Optical Properties of Self Assembled II-VI Semiconductor Quantum Dots written by Chulsoo Kim and published by . This book was released on 2000 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Elena Borovitskaya
Publisher : World Scientific
ISBN 13 : 9814488798
Total Pages : 214 pages
Book Rating : 4.8/5 (144 download)
Download or read book Quantum Dots written by Elena Borovitskaya and published by World Scientific. This book was released on 2002-07-08 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book, leading experts on quantum dot theory and technology provide comprehensive reviews of all aspects of quantum dot systems. The following topics are covered: (1) energy states in quantum dots, including the effects of strain and many-body effects; (2) self-assembly and self-ordering of quantum dots in semiconductor systems; (3) growth, structures, and optical properties of III-nitride quantum dots; (4) quantum dot lasers.
Author : Tom Pearsall
Publisher : Springer Science & Business Media
ISBN 13 : 1461544513
Total Pages : 270 pages
Book Rating : 4.4/5 (615 download)
Download or read book Quantum Semiconductor Devices and Technologies written by Tom Pearsall and published by Springer Science & Business Media. This book was released on 2013-11-27 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: stacked QD structure and is useful for examining the possibility of all optical measurement of stacked QD layers. Optical absorption spectra of self-assembled QDs has been little reported, and further investigation in necessary to study hole-burning memory. 2.5 Summary This chapter describes recent advances in quantum dot fabrication tech nologies, focusing on our self-formed quantum dot technologies including TSR quantum dots and SK-mode self-assembled quantum dots. As is described in this chapter, there are many possible device applications such as quantum dot tunneling memory devices, quantum dot fioating-dot gate FETs, quantum dot lasers, and quantum dot hole-burning memory devices. The quantum dot laser applications seem to be the most practicable among these applications. However, many problems remain to be solved before even this application becomes practical. The most important issue is to of self-assembled quantum dots more pre control the size and position cisely, with an accuracy on an atomic scale. The confinement must be enough to keep the separation energy between quantized energy levels high enough to get high-temperature characteristics. The lasing oscillation frequency should be fixed at 1.3 f.lITl or 1.5 f.lITl for optical communication. Phonon bottleneck problems should be solved by the optimization of device structures. Fortunately, there is much activity in the area of quantum dot lasers and, therefore, many breakthroughs will be made, along with the exploration of other new application areas.
Author : Xin Tong
Publisher : Springer Nature
ISBN 13 : 3030742709
Total Pages : 319 pages
Book Rating : 4.0/5 (37 download)
Download or read book Quantum Dot Photodetectors written by Xin Tong and published by Springer Nature. This book was released on 2021-09-17 with total page 319 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a comprehensive overview of state-of-the-art quantum dot photodetectors, including device fabrication technologies, optical engineering/manipulation strategies, and emerging photodetectors with building blocks of novel quantum dots (e.g. perovskite) as well as their hybrid structured (e.g. 0D/2D) materials. Semiconductor quantum dots have attracted much attention due to their unique quantum confinement effect, which allows for the facile tuning of optical properties that are promising for next-generation optoelectronic applications. Among these remarkable properties are large absorption coefficient, high photosensitivity, and tunable optical spectrum from ultraviolet/visible to infrared region, all of which are very attractive and favorable for photodetection applications. The book covers both fundamental and frontier research in order to stimulate readers' interests in developing novel ideas for semiconductor photodetectors at the center of future developments in materials science, nanofabrication technology and device commercialization. The book provides a knowledge sharing platform and can be used as a reference for researchers working in the fields of photonics, materials science, and nanodevices.
Author :
Publisher :
ISBN 13 :
Total Pages : 27 pages
Book Rating : 4.:/5 (318 download)
Download or read book Self Assembled Semiconductor Quantum Dots for Spin Based All Optical and Electronic Quantum Computing written by and published by . This book was released on 2008 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: This project involved the study of self-assembled quantum dots as hosts for spin based qubits. Both semiconductor quantum dots, nanowires, and organic quantum dots were studied and the spin relaxation times were measured. The organic Alq3 appears to have very long longitudinal spin relaxation time of nearly 1 second at a temperature of 100 K, and a nearly temperature independent transverse relaxation time> 3 nsec in the range 2-300 K. This relaxation time is sufficient to fulfill the Knill criterion for fault-tolerant quantum computing at room temperature. Since organics have special selection rules for radiative transitions whereby triplet electron-hole pairs are dark excitons and only singlets are radiative, there is a natural qubit read out scheme for organic quantum dots. We have also studied inorganic semiconductor quantum dots, but find them inferior to their organic counterparts for spin based quantum computing, primarily because spin-orbit interactions are much stronger in inorganic quantum dots, leading to much faster spin dephasing.
Author : Elena Borovitskaya
Publisher : World Scientific Publishing Company Incorporated
ISBN 13 : 9789810249182
Total Pages : 205 pages
Book Rating : 4.2/5 (491 download)
Download or read book Quantum Dots written by Elena Borovitskaya and published by World Scientific Publishing Company Incorporated. This book was released on 2002-01-01 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book, leading experts on quantum dot theory and technology provide comprehensive reviews of all aspects of quantum dot systems. The following topics are covered: (1) energy states in quantum dots, including the effects of strain and many-body effects; (2) self-assembly and self-ordering of quantum dots in semiconductor systems; (3) growth, structures, and optical properties of III-nitride quantum dots; (4) quantum dot lasers.
Author : Aleksandr Georgievich Tartakovskiĭ
Publisher :
ISBN 13 : 9781139531825
Total Pages : 358 pages
Book Rating : 4.5/5 (318 download)
Download or read book Quantum Dots written by Aleksandr Georgievich Tartakovskiĭ and published by . This book was released on 2012 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt: "A comprehensive review of cutting-edge solid state research, focusing on its prominent example - quantum dot nanostructures, this book features a broad range of techniques for fabrication of these nano-structured semiconductors and control of their quantum properties. Written by leading researchers, the book considers advanced III-V and II-VI semiconductor quantum dots (QDs) realized by self-assembly, lithography and chemical synthesis; novel QD structures in nanowires and graphene; and transport and optical methods for control of single QDs"--
Author : R Ferreira
Publisher : Myprint
ISBN 13 : 9781681747514
Total Pages : 114 pages
Book Rating : 4.7/5 (475 download)
Download or read book Capture and Relaxation in Self-Assembled Semiconductor Quantum Dots written by R Ferreira and published by Myprint. This book was released on 2015-12-18 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:
