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Author: Tyler Park
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 85
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Book Description
InGaAs quantum dot chains were grown with a low-temperature variation of the Stranski-Krastanov method, the conventional epitaxial method. This new method seeks to reduce indium segregation and intermixing in addition to giving greater control in the growth process. We used photoluminescence spectroscopy techniques to characterize the quality and electronic structure of these samples. We have recently used a transmission electron microscope to show how the quantum dots vary with annealing temperature. Some questions relating to the morphology of the samples cannot be answered by photoluminescence spectroscopy alone. Using transmission electron microscopy, we verified flattening of the quantum dots with annealing temperature and resolved the chemical composition with cross-section cuts and plan view cuts.
Author: Tyler Park
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 85
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Book Description
InGaAs quantum dot chains were grown with a low-temperature variation of the Stranski-Krastanov method, the conventional epitaxial method. This new method seeks to reduce indium segregation and intermixing in addition to giving greater control in the growth process. We used photoluminescence spectroscopy techniques to characterize the quality and electronic structure of these samples. We have recently used a transmission electron microscope to show how the quantum dots vary with annealing temperature. Some questions relating to the morphology of the samples cannot be answered by photoluminescence spectroscopy alone. Using transmission electron microscopy, we verified flattening of the quantum dots with annealing temperature and resolved the chemical composition with cross-section cuts and plan view cuts.
Author:
Publisher:
ISBN:
Category : Molecules
Languages : en
Pages : 104
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Book Description
InAs quantum dot molecules (QDMs) are obtained from quantum dot (QD) overgrowth on nanopropeller templates which are grown by thin-capping-and-regrowth molecular beam epitaxy (MBE) process. The template structure is elongated along [110] crystallographic direction with QDs at the centre. They were used to grow QDMs aligned in that direction. Multi-cycles of thin-capping-and-regrowth with appropriate thin-capping thickness were investigated in order to create long nanopropeller templates. They are used as templates for the growth of long chain quantum dot molecules. By overgrowth of additional QDs in the final cycle of thin-capping-and-regrowth, satellite QDs are created on nanopropeller blades. With proper overgrowth thickness, long chain QDMs are successfully created on long nanopropeller templates. Lateral alignment of long chain QDMs contribute to anisotropic coupling among QDs. They lead to different magnitudes of wave vectors between [110] and [110] directions in the energy band structure of QDs ensembles. Hence, long chain QDMs demonstrate anisotropy of optical property, i.e. polarization dependence of PL spectrum, while as-grown QDs and small-group QDMs do not exhibit this property. The polarization degree of optical property agrees with the length of QDMs and their templates. However high QD density limits the anisotropic property due to increased QD coupling along the [110] direction.
Author: Zhiming M Wang
Publisher: Springer Science & Business Media
ISBN: 0387741917
Category : Technology & Engineering
Languages : en
Pages : 470
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Book Description
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:
Publisher: Academic Press
ISBN: 0080864589
Category : Technology & Engineering
Languages : en
Pages : 385
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Book Description
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: 9535106481
Category : Science
Languages : en
Pages : 482
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Book Description
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: Christopher Prohl
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Oliver G. Schmidt
Publisher: Springer Science & Business Media
ISBN: 3540469362
Category : Technology & Engineering
Languages : en
Pages : 700
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Book Description
This book describes the full range of possible strategies for laterally aligning self-assembled quantum dots on a substrate surface, beginning with pure self-ordering mechanisms and culminating with forced alignment by lithographic positioning. The text addresses both short- and long-range ordering phenomena and introduces future high integration of single quantum dot devices on a single chip. Contributions by well-known experts ensure that all relevant quantum-dot heterostructures are elucidated from diverse perspectives.
Author: Orion Ciftja
Publisher:
ISBN: 9781619429680
Category : Quantum dots
Languages : en
Pages : 0
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Book Description
Nanoscience and nanotechnology is continuously moving forward enabling the precise, controlled fabrication of structures and devices at atomic and molecular scales. Quantum dots are typically semiconductor nanocrystals that have gained tremendous attention due to their unique electronic, magnetic, chemical and optical properties. They have proven very useful in applications in many fields across the physical, engineering, chemical, biological and medical sciences. In this book, the authors give an overview of the progress and major research developments in the field of quantum dots over the past two decades. They specifically focus on discussing the cutting-edge applications in the fields of information technology, electronics, biotechnology, energy, medicine, cellular imaging and diagnostic bio-sensing.
Author: Arjun Mandal
Publisher: Springer
ISBN: 9811043345
Category : Technology & Engineering
Languages : en
Pages : 84
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Book Description
This book looks at the effects of ion implantation as an effective post-growth technique to improve the material properties, and ultimately, the device performance of In(Ga)As/GaAs quantum dot (QD) heterostructures. Over the past two decades, In(Ga)As/GaAs-based QD heterostructures have marked their superiority, particularly for application in lasers and photodetectors. Several in-situ and ex-situ techniques that improve material quality and device performance have already been reported. These techniques are necessary to maintain dot density and dot size uniformity in QD heterostructures and also to improve the material quality of heterostructures by removing defects from the system. While rapid thermal annealing, pulsed laser annealing and the hydrogen passivation technique have been popular as post-growth methods, ion implantation had not been explored largely as a post-growth method for improving the material properties of In(Ga)As/GaAs QD heterostructures. This work attempts to remedy this gap in the literature. The work also looks at introduction of a capping layer of quaternary alloy InAlGaAs over these In(Ga)As/GaAs QDs to achieve better QD characteristics. The contents of this volume will prove useful to researchers and professionals involved in the study of QDs and QD-based devices.
Author: Yarub Al-Douri
Publisher:
ISBN: 9780750357029
Category : Technology & Engineering
Languages : en
Pages : 0
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Book Description
