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Structural Optical And Spectral Behaviour Of Inas Based Quantum Dot Heterostructures
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Book Synopsis Structural, Optical and Spectral Behaviour of InAs-based Quantum Dot Heterostructures by : Saumya Sengupta
Download or read book Structural, Optical and Spectral Behaviour of InAs-based Quantum Dot Heterostructures written by Saumya Sengupta and published by Springer. This book was released on 2017-08-04 with total page 77 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book explores the effects of growth pause or ripening time on the properties of quantum dots(QDs). It covers the effects of post-growth rapid thermal annealing (RTA) treatment on properties of single layer QDs. The effects of post-growth rapid thermal annealing (RTA) treatment on properties of single layer QDs are discussed. The book offers insight into InAs/GaAs bilayer QD heterostructures with very thin spacer layers and discusses minimum spacer thickness required to grow electronically coupled bilayer QD heterostructures. These techniques make bilayer QD heterostructures a better choice over the single layer and uncoupled multilayer QD heterostructure. Finally, the book discusses sub-monolayer (SML) growth technique to grow QDs. This recent technique has been proven to improve the device performance significantly. The contents of this monograph will prove useful to researchers and professionals alike.
Book Synopsis Quantum Dot Heterostructures by : Dieter Bimberg
Download or read book Quantum Dot Heterostructures written by Dieter Bimberg and published by John Wiley & Sons. This book was released on 1999-03-17 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: Da die Nachfrage nach immer schnelleren und kleineren Halbleiterbauelementen stetig wächst, sind Quanten-Dots und -Pyramiden rasant in den Mittelpunkt der Halbleiterforschung gerückt. Dieses Buch vermittelt einen umfassenden Überblick über den aktuellen Forschungsstand auf diesem Gebiet. Behandelt werden u.a. Fragen, wie Strukturen aufgebaut, wie sie charakterisiert werden und wie sie die Leistungsfähigkeit der Bauelemente bestimmen. (11/98)
Book Synopsis Advances in Smart Medical, IoT & Artificial Intelligence by : Mohammed Serrhini
Download or read book Advances in Smart Medical, IoT & Artificial Intelligence written by Mohammed Serrhini and published by Springer Nature. This book was released on with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Semiconductor Quantum Dots by : Y. Masumoto
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.
Book Synopsis Electronic Structure and Optical Properties of Sb-based Self-assembled Quantum Dots for the Mid-infrared Range by : Gik Hong Yeap
Download or read book Electronic Structure and Optical Properties of Sb-based Self-assembled Quantum Dots for the Mid-infrared Range written by Gik Hong Yeap and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantum dots (QDs) are zero-dimensional nanostructures that confined carriers in three dimensions comparable to their de Broglie wavelengths. Therefore, carriers exhibit?-shaped energy levels and densities of states. Due to their band structure, QD systems show significant advantages as active regions in laser cavities, both in term of lower threshold current densities and better thermal behaviour. The most studied system being InAs/GaAs system but the antimonide-based (Sb-based) material system has been paid much attention due to their potential for optical devices in the 3-5?m (0.25-0.40 eV) spectral regions and motivated by feasibility of active medium in high speed electronic and long wavelength photonic devices. In most cases, QDs structures had been obtained with an intrinsic elastic strain field arising from the lattice mismatch between the matrix and QD materials. The strain field plays a very significant role in the fabrication of the self-assembled QDs (SAQDs). Strain fields inside SAQD structures strongly affect the electronic band structure, which in turn, strongly affects the performance of optoelectronic devices. Therefore, knowledge and determination of the strain field in the dots and surrounding matrix is crucial in order to obtain a well ordered SAQDs structure. While knowledge and determination of the electronic structure calculation are necessary for further device modelling to improve the performance of the devices. Numerical work based on continuum-elasticity based on Finite Element Method (FEM) and standard-deformation-potential theory has been carried out to investigate the effect of strain on the band structure for InSb-based SAQD systems with type-I and type-II band alignment. The effect of elastic anisotropy on both strain distribution and band edges profile is also performed. Next, multi-band k?p method is used to model the electronic structure of InSb-based SAQD systems. The results from the modelling show that the strain-modified band profile of the zinc-blende III-V compound semiconductor SAQDs is not very sensitive to the details of the dot shape and the major governing parameter of the geometry is the aspect ratio of the dot. The modelling results also reveal that there are no appropriate material combinations for zinc-blende III-V compound semiconductors that would applicable for the MIR 3-5?m (0.25-0.40 eV) emission range when type-I band alignment is possible. This leads to the investigation of type-II broken gap InAsxSb(1-x)/InAs SAQDs. Finally, the optical properties of the InSb-based SAQDs are investigated by means of the photoluminescence (PL) measurement using Fourier transform infrared (FT-IR) spectroscopy. The PL results are analysed and compared to the modelling results.
Book Synopsis Self-Assembled Quantum Dots by : Zhiming M Wang
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.
Book Synopsis Optical, Electronic and Special Materials by : Juraj Marek
Download or read book Optical, Electronic and Special Materials written by Juraj Marek and published by Trans Tech Publications Ltd. This book was released on 2023-05-31 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: Special topic volume with invited peer-reviewed papers only
Book Synopsis 2nd International Conference on Semiconductor Materials and Technology (ICoSeMT 2021) by : Hock Jin Quah
Download or read book 2nd International Conference on Semiconductor Materials and Technology (ICoSeMT 2021) written by Hock Jin Quah and published by Trans Tech Publications Ltd. This book was released on 2023-07-27 with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt: Selected peer-reviewed extended articles based on abstracts presented at the 2nd International Conference on Semiconductor Materials and Technology (ICoSeMT 2021) Aggregated Book
Book Synopsis Fingerprints in the Optical and Transport Properties of Quantum Dots by : Ameenah Al-Ahmadi
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.
Book Synopsis Impact of Ion Implantation on Quantum Dot Heterostructures and Devices by : Arjun Mandal
Download or read book Impact of Ion Implantation on Quantum Dot Heterostructures and Devices written by Arjun Mandal and published by Springer. This book was released on 2017-06-02 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Optical characterization of GaAs based quantum dot and well structures, and InAs nanowires on Si for infrared photo detection by :
Download or read book Optical characterization of GaAs based quantum dot and well structures, and InAs nanowires on Si for infrared photo detection written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Quantum Dots: Fundamentals, Applications, and Frontiers by : Bruce A. Joyce
Download or read book Quantum Dots: Fundamentals, Applications, and Frontiers written by Bruce A. Joyce and published by Springer Science & Business Media. This book was released on 2006-03-30 with total page 401 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains papers delivered at a NATO Advanced Research Workshop and provides a broad introduction to all major aspects of quantum dot structures. Such structures have been produced for studies of basic physical phenomena, for device fabrication and, on a more speculative level, have been suggested as components of a solid-state realization of a quantum computer. The book is structured so that the reader is introduced to the methods used to produce and control quantum dots, followed by discussions of their structural, electronic, and optical properties. It concludes with examples of how their optical properties can be used in practical devices, including lasers and light-emitting diodes operating at the commercially important wavelengths of 1.3 Am and 1.55 Am."
Book Synopsis Optical Spectroscopy of InAs GaAs Quantum Dot Molecules by : Shilpa Sanwlani Arora
Download or read book Optical Spectroscopy of InAs GaAs Quantum Dot Molecules written by Shilpa Sanwlani Arora and published by . This book was released on 2011-11 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Self-assembled Quantum Dots in Advanced Structures by : Megan Elizabeth Creasey
Download or read book Self-assembled Quantum Dots in Advanced Structures written by Megan Elizabeth Creasey and published by . This book was released on 2012 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in nanofabrication have bolstered the development of new optical devices with potential uses ranging from conventional optoelectronics, such as lasers and solar cells, to novel devices, like single photon or entangled photon sources. Quantum encryption of optical communications, in particular, requires devices that couple efficiently to an optical fiber and emit, on demand, indistinguishable photons. With these goals in mind, ultrafast spectroscopy is used to study the electron dynamics in epitaxially grown InAs/GaAs quantum dots (QDs). Quantifying the behavior of these systems is critical to the development of more efficient devices. Studies of two newly developed InGaAs QD structures, quantum dot clusters (QDCs) and QDs embedded in photonic wires, are presented herein. GaAs photonic wires with diameters in the range of 200 to 250 nm support only the fundamental HE11 guided mode. To fully quantify these new systems, the emission dynamics of QDs contained within wires in a large range of diameters are studied. Time correlated single photon counting measurements of the ground state exciton lifetimes are in very good agreement with predicted theoretical values for the spontaneous emission rates. For diameters smaller than 200 nm, QD emission into the HE11 mode is strongly inhibited and non-radiative processes dominate the decay rate. The best small diameter wires exhibit inhibition factors as high as 16, on par with the current state of the art for photonic crystals. The QDCs are the product of a hybrid growth technique that combines droplet heteroepitaxy with standard Stranski-Krastanov growth to create many different geometries of QDs. The work presented in this dissertation concentrates specifically on hexa-QDCs consisting of six InAs QDs around a GaAs nanomound. The first ever spectral and temporal properties of QDs within individual hexa-QDCs are presented. The QDs exhibit narrow exciton resonances with good temperature stability, indicating that excitons are well confined within individual QDs. A distinct biexponential decay is observed even at the single QD level. This behavior suggests that non-radiative decay mechanisms and exciton occupation of dark states play a significant role in the recombination dynamics in the QDCs.
Book Synopsis Electronic and Optical Properties of InAs/GaAs Semiconductor Quantum Dots by : Mark Thomas Crowley
Download or read book Electronic and Optical Properties of InAs/GaAs Semiconductor Quantum Dots written by Mark Thomas Crowley and published by . This book was released on 2010 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work presents a theoretical study of the 1.3mm InAs/GaAs semiconductor quantum dot (QD) material system. A detailed 8-band k.P formalism accounting for all strain effects is used to calculate realistic distributions of dot carrier levels for typical 1.3mm InAs/GaAs dot structures as well as computing the optical transition strengths between these carrier states. The observed weak variation of the threshold radiative current density of 1.3mm InAs/GaAs QD lasers with temperature is shown to result from the much weaker optical matrix element of the excited dot states relative to the ground state (GS) transition. The observed sharp increase of the nonradiative component of the threshold current density around room temperature is attributed to Auger recombination. It is concluded that temperature-dependent loss mechanisms remain as significant in 1.3mm QD lasers as in conventional 1.3mm devices. The observation of a finite GS transverse magnetic absorption is attributed to transitions between GS electrons and low-lying excited hole states which possess a significant light-hole component of the correct symmetry to recombine with the GS electrons. It is shown that this absorption line is enhanced for dots having a small base to height aspect ratio whereas for dots with large aspect ratio it is effectively switched off. In addition, the absorption spectrum of GS electrons is found to consist of two distinct absorption lines. The lower energy of these originates from recombination between GS electrons and GS holes. The second, higher energy peak, arises primarily due to recombination between GS electrons and with holes containing GS light-hole character. Finally, two colour phase dynamics at 1.3mm are investigated. It is shown that InAs/GaAs QD SOAs retain significant promise for high speed optical switches based on cross phase modulation.
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2540 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Colloidal Quantum Dot Optoelectronics and Photovoltaics by : Gerasimos Konstantatos
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.
