Download or read book Tuning Optical Properties of 2D Semiconductors by Strain and Electrostatic Gating written by Minda Deng and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to their two-dimensional (2D) nature, atomically thin transition metal dichalcogenides (TMDCs) exhibit properties that are greatly distinct from their bulk counterparts. At the single layer limit, the strong light-matter interaction and transition from indirect-gap to direct-gap enable new fundamental physics and optoelectronic applications. It is of great significance that the optical properties of atomically thin TMDCs could be controlled by external tuning knobs. In the dissertation, two external knobs are presented: strain and electrostatic gating. For strain tuning, we use bendable flexible substrates to apply uniaxial tensile strain to monolayer WSe2 samples and probe them with absorption and PL measurements. We show that tensile strain around 2.1% not only reduces the optical band gap by around 100 meV, but also greatly narrows the exciton linewidth. By modeling different components to excitonic linewidth, we attribute this reduction to the suppressed intervalley exciton-phonon scattering under tensile strain. This explanation is further consolidated by measurements on monolayer WS2 and bilayer WSe2. Another external tuning knob investigated is the presence of free charge carriers in the system, which could be injected into 2D materials by electrostatic gating. A high carrier concentration (~ 1013 cm-2) is realized through the electric-double-layer gating technique with ionic solid LaF3. Doping-dependent absorption measurements on monolayer WSe2 show that excitons are dissociated due to increased Coulomb screening at high free carrier concentrations. As a result, excitonic peaks are gradually replaced by a step-function like band-to-band transition feature in absorption spectra. Distinctive effects of screening and state filling due to free carriers are also observed through the different behaviors of A/B excitonic features. The works presented in this dissertation demonstrate that strain and electrostatic gating are two powerful knobs for both probing the fundamental physics in 2D semiconductors and realizing novel optoelectronic applications.
Download or read book Strain Tuning of Thermal Electrical and Optical Properties of Semiconductors written by Xianghai Meng and published by . This book was released on 2019 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: The discovery of graphene by mechanical exfoliation has opened a new realm of research. Compared to traditional 3D crystal structures, 2D materials are characterized by strong in-plane covalent bond and weak interlayer van der Waals force, giving them unique 2D crystal structure. In the past ten years, various 2D materials have been explored with very different electronic properties, ranging from wide band-gap insulators to conductors. Owing to the different bond strength, 2D materials behave differently in their electrical, thermal properties along the cross-plane and in-plane direction. In addition, the in-plane electrical, optical and thermal properties are also found to be anisotropic for some particular 2D materials due to the asymmetric crystal structure. Both the in-plane and cross-plane anisotropic properties of 2D materials give rise to a possibility to design the micro/nano devices in various applications. The intrinsic properties of TMDs can be further adjusted by external factors, such as electrical fields, temperature, magnetic field, et al. Among all the external stimulations, strain has been shown an effective method to control the electronic, thermal, optical properties of semiconductors. With the discovery of 2D materials, the application of strain tuning has been growing since the reduced dimensional structures can sustain much larger strains than bulk crystals. In this dissertation, in-plane anisotropic nonlinear optical nonlinearity is studies with an Intensity-scan spectroscopy at ambient conditions. Then a diamond anvil cell (DAC) device is employed to generate large strain on MoS2. With our home-built pico-second Transient Thermoreflectance technique, ~7x enhancement in cross-plane is observed due to the pressure/strain modified interlayer interaction. Moreover, photoluminescence and Raman spectroscopy are used to probe the impurity levels in BAs crystal. Pressure/Strain modified impurity level change will also have significant effect on this high thermal conductivity material. Lastly, a modified pico-second Transient Thermoreflectance system is developed to achieve simultaneous measurement on thermal conductivity and specific heat of materials
Download or read book 2D Semiconductor Materials and Devices written by Dongzhi Chi and published by Elsevier. This book was released on 2019-10-19 with total page 339 pages. Available in PDF, EPUB and Kindle. Book excerpt: 2D Semiconductor Materials and Devices reviews the basic science and state-of-art technology of 2D semiconductor materials and devices. Chapters discuss the basic structure and properties of 2D semiconductor materials, including both elemental (silicene, phosphorene) and compound semiconductors (transition metal dichalcogenide), the current growth and characterization methods of these 2D materials, state-of-the-art devices, and current and potential applications. - Reviews a broad range of emerging 2D electronic materials beyond graphene, including silicene, phosphorene and compound semiconductors - Provides an in-depth review of material properties, growth and characterization aspects—topics that could enable applications - Features contributions from the leading experts in the field
Download or read book Frontiers in Optics and Photonics written by Federico Capasso and published by Walter de Gruyter GmbH & Co KG. This book was released on 2021-06-08 with total page 783 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a cutting-edge research overview on the latest developments in the field of Optics and Photonics. All chapters are authored by the pioneers in their field and will cover the developments in Quantum Photonics, Optical properties of 2D Materials, Optical Sensors, Organic Opto-electronics, Nanophotonics, Metamaterials, Plasmonics, Quantum Cascade lasers, LEDs, Biophotonics and biomedical photonics and spectroscopy.
Download or read book 2D Monoelemental Materials Xenes and Related Technologies written by Zongyu Huang and published by CRC Press. This book was released on 2022-04-19 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: Monoelemental 2D materials called Xenes have a graphene-like structure, intra-layer covalent bond, and weak van der Waals forces between layers. Materials composed of different groups of elements have different structures and rich properties, making Xenes materials a potential candidate for the next generation of 2D materials. 2D Monoelemental Materials (Xenes) and Related Technologies: Beyond Graphene describes the structure, properties, and applications of Xenes by classification and section. The first section covers the structure and classification of single-element 2D materials, according to the different main groups of monoelemental materials of different components and includes the properties and applications with detailed description. The second section discusses the structure, properties, and applications of advanced 2D Xenes materials, which are composed of heterogeneous structures, produced by defects, and regulated by the field. Features include: Systematically detailed single element materials according to the main groups of the constituent elements Classification of the most effective and widely studied 2D Xenes materials Expounding upon changes in properties and improvements in applications by different regulation mechanisms Discussion of the significance of 2D single-element materials where structural characteristics are closely combined with different preparation methods and the relevant theoretical properties complement each other with practical applications Aimed at researchers and advanced students in materials science and engineering, this book offers a broad view of current knowledge in the emerging and promising field of 2D monoelemental materials.
Download or read book Strain Effect in Semiconductors written by Yongke Sun and published by Springer Science & Business Media. This book was released on 2009-11-14 with total page 353 pages. Available in PDF, EPUB and Kindle. Book excerpt: Strain Effect in Semiconductors: Theory and Device Applications presents the fundamentals and applications of strain in semiconductors and semiconductor devices that is relevant for strain-enhanced advanced CMOS technology and strain-based piezoresistive MEMS transducers. Discusses relevant applications of strain while also focusing on the fundamental physics pertaining to bulk, planar, and scaled nano-devices. Hence, this book is relevant for current strained Si logic technology as well as for understanding the physics and scaling for future strained nano-scale devices.
Download or read book 2D Functional Nanomaterials written by Ganesh S. Kamble and published by John Wiley & Sons. This book was released on 2022-03-14 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt: 2D Functional Nanomaterials Outlines the latest developments in 2D heterojunction nanomaterials with energy conversion applications In 2D Functional Nanomaterials: Synthesis, Characterization, and Applications, Dr. Ganesh S. Kamble presents an authoritative overview of the most recent progress in the rational design and synthesis of 2D nanomaterials and their applications in semiconducting catalysts, biosensors, electrolysis, batteries, and solar cells. This interdisciplinary volume is a valuable resource for materials scientists, electrical engineers, nanoscientists, and solid-state physicists looking for up-to-date information on 2D heterojunction nanomaterials. The text summarizes the scientific contributions of international experts in the fabrication and application of 2D nanomaterials while discussing the importance and impact of 2D nanomaterials on future economic growth, novel manufacturing processes, and innovative products. Provides thorough coverage of graphene chemical derivatives synthesis and applications, including state-of-the-art developments and perspectives Describes 2D/2D graphene oxide-layered double hydroxide nanocomposites for immobilization of different radionuclides Covers 2D nanomaterials for biomedical applications and novel 2D nanomaterials for next-generation photodetectors Discusses applications of 2D nanomaterials for cancer therapy and recent trends ingraphene-latex nanocomposites Perfect for materials scientists, inorganic chemists, and electronics engineers, 2D Functional Nanomaterials: Synthesis, Characterization, and Applications is also an essential resource for solid-state physicists seeking accurate information on recent progress in two-dimensional heterojunction materials with energy conversion applications.
Download or read book Anisotropic 2D Materials and Devices written by Yuerui Lu and published by Royal Society of Chemistry. This book was released on 2022-09-23 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presenting recent progress in anisotropic 2D materials research, reader is introduced to phosphorene and its arsenic alloys, monochalcogenides of group IV elements in the form of MX (M = Ge, Sn and X = S, Se, Te), low-symmetry transition-metal dichalcogenide (TMD) materials such as rhenium disulphide (ReS2) and rhenium diselenide (ReSe2), and organic 2D materials. Providing detailed synthesis protocols and characterization techniques for these various anisotropic 2D materials, readers will learn their specific technological scopes for next generation electronics, optoelectronics and biomedical applications, challenges and future directions. Edited by an leading expert, contributors cover enhanced many-body interactions and high binding energy 1D particle dynamics to showcase design of high-performance optoelectronic devices; anisotropic polariton for designing polariton based laser systems; applications in bio-imaging, cancer diagnosis and therapies, drug delivery and release, and antibacterial performance; and finally, their potential in nano-electro-mechanical devices. Considering all these areas in detail, this book is a useful reference to the scientific communities working in related research fields, especially for materials scientists, chemists, physicists and electronics/electrical/energy engineers. This book may also be of use to those in chemical academia and industry more broadly.
Download or read book 2D Materials written by Phaedon Avouris and published by Cambridge University Press. This book was released on 2017-06-29 with total page 521 pages. Available in PDF, EPUB and Kindle. Book excerpt: Learn about the most recent advances in 2D materials with this comprehensive and accessible text. Providing all the necessary materials science and physics background, leading experts discuss the fundamental properties of a wide range of 2D materials, and their potential applications in electronic, optoelectronic and photonic devices. Several important classes of materials are covered, from more established ones such as graphene, hexagonal boron nitride, and transition metal dichalcogenides, to new and emerging materials such as black phosphorus, silicene, and germanene. Readers will gain an in-depth understanding of the electronic structure and optical, thermal, mechanical, vibrational, spin and plasmonic properties of each material, as well as the different techniques that can be used for their synthesis. Presenting a unified perspective on 2D materials, this is an excellent resource for graduate students, researchers and practitioners working in nanotechnology, nanoelectronics, nanophotonics, condensed matter physics, and chemistry.
Download or read book Two dimensional Materials written by Pramoda Kumar Nayak and published by BoD – Books on Demand. This book was released on 2016-08-31 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: There are only a few discoveries and new technologies in materials science that have the potential to dramatically alter and revolutionize our material world. Discovery of two-dimensional (2D) materials, the thinnest form of materials to ever occur in nature, is one of them. After isolation of graphene from graphite in 2004, a whole other class of atomically thin materials, dominated by surface effects and showing completely unexpected and extraordinary properties, has been created. This book provides a comprehensive view and state-of-the-art knowledge about 2D materials such as graphene, hexagonal boron nitride (h-BN), transition metal dichalcogenides (TMD) and so on. It consists of 11 chapters contributed by a team of experts in this exciting field and provides latest synthesis techniques of 2D materials, characterization and their potential applications in energy conservation, electronics, optoelectronics and biotechnology.
Download or read book Applications of Nanobiotechnology written by Margarita Stoytcheva and published by BoD – Books on Demand. This book was released on 2020-07-08 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is dedicated to the applications of nanobiotechnology, i.e. the way that nanotechnology is used to create devices to study biological systems and phenomena. It includes seven chapters, organized in two sections. The first section (Chapters 1–5) covers a large spectrum of issues associated with nanoparticle synthesis, nanoparticle toxicity, and the role of nanotechnology in drug delivery, tissue engineering, agriculture, and biosensing. The second section (Chapters 6 and 7) is devoted to the properties of nanofluids and the medical and biological applications of computational fluid dymanics modeling.
Download or read book Advances in Condensed Matter and Materials Physics written by Jagannathan Thirumalai and published by BoD – Books on Demand. This book was released on 2020-05-06 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book, Condensed Matter and Material Physics, incorporates the work of multiple authors to enhance the theoretical as well as experimental knowledge of materials. The investigation of crystalline solids is a growing need in the electronics industry. Micro and nano transistors require an in-depth understanding of semiconductors of different groups. Amorphous materials, on the other hand, as non-equilibrium materials are widely applied in sensors and other medical and industrial applications. Superconducting magnets, composite materials, lasers, and many more applications are integral parts of our daily lives. Superfluids, liquid crystals, and polymers are undergoing active research throughout the world. Hence profound information on the nature and application of various materials is in demand. This book bestows on the reader a deep knowledge of physics behind the concepts, perspectives, characteristic properties, and prospects. The book was constructed using 10 contributions from experts in diversified fields of condensed matter and material physics and its technology from over 15 research institutes across the globe.
Download or read book Two Dimensional Transition Metal Dichalcogenides written by Alexander V. Kolobov and published by Springer. This book was released on 2016-07-26 with total page 545 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book summarizes the current status of theoretical and experimental progress in 2 dimensional graphene-like monolayers and few-layers of transition metal dichalcogenides (TMDCs). Semiconducting monolayer TMDCs, due to the presence of a direct gap, significantly extend the potential of low-dimensional nanomaterials for applications in nanoelectronics and nano-optoelectronics as well as flexible nano-electronics with unprecedented possibilities to control the gap by external stimuli. Strong quantum confinement results in extremely high exciton binding energies which forms an interesting platform for both fundamental studies and device applications. Breaking of spatial inversion symmetry in monolayers results in strong spin-valley coupling potentially leading to their use in valleytronics. Starting with the basic chemistry of transition metals, the reader is introduced to the rich field of transition metal dichalcogenides. After a chapter on three dimensional crystals and a description of top-down and bottom-up fabrication methods of few-layer and single layer structures, the fascinating world of two-dimensional TMDCs structures is presented with their unique atomic, electronic, and magnetic properties. The book covers in detail particular features associated with decreased dimensionality such as stability and phase-transitions in monolayers, the appearance of a direct gap, large binding energy of 2D excitons and trions and their dynamics, Raman scattering associated with decreased dimensionality, extraordinarily strong light-matter interaction, layer-dependent photoluminescence properties, new physics associated with the destruction of the spatial inversion symmetry of the bulk phase, spin-orbit and spin-valley couplings. The book concludes with chapters on engineered heterostructures and device applications such as a monolayer MoS2 transistor. Considering the explosive interest in physics and applications of two-dimensional materials, this book is a valuable source of information for material scientists and engineers working in the field as well as for the graduate students majoring in materials science.
Download or read book Optical Properties Of Graphene written by Rolf Binder and published by World Scientific. This book was released on 2016-11-11 with total page 517 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive state-of-the-art overview of the optical properties of graphene. During the past decade, graphene, the most ideal and thinnest of all two-dimensional materials, has become one of the most widely studied materials. Its unique properties hold great promise to revolutionize many electronic, optical and opto-electronic devices. The book contains an introductory tutorial and 13 chapters written by experts in areas ranging from fundamental quantum mechanical properties to opto-electronic device applications of graphene.
Download or read book Quantum Confined Excitons in 2 Dimensional Materials written by Carmen Palacios-Berraquero and published by Springer. This book was released on 2018-11-02 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the first established experimental results of an emergent field: 2-dimensional materials as platforms for quantum technologies, specifically through the optics of quantum-confined excitons. It also provides an extensive review of the literature from a number of disciplines that informed the research, and introduces the materials of focus – 2d Transition Metal Dichalcogenides (2d-TMDs) – in detail, discussing electronic and chemical structure, excitonic behaviour and response to strain. This is followed by a brief overview of quantum information technologies, including concepts such as single-photon sources and quantum networks. The methods chapter addresses quantum optics techniques and 2d-material processing, while the results section shows the development of a method to deterministically create quantum dots (QDs) in the 2d-TMDs, which can trap single-excitons; the fabrication of atomically thin quantum light-emitting diodes to induce all-electrical single-photon emission from the QDs, and lastly, the use of devices to controllably trap single-spins in the QDs –the first step towards their use as optically-addressable matter qubits.
Download or read book Graphene Science Handbook written by Mahmood Aliofkhazraei and published by CRC Press. This book was released on 2016-04-27 with total page 719 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discover the Unique Electron Transport Properties of GrapheneThe Graphene Science Handbook is a six-volume set that describes graphene's special structural, electrical, and chemical properties. The book considers how these properties can be used in different applications (including the development of batteries, fuel cells, photovoltaic cells, and s
Download or read book Solid State Properties written by Mildred Dresselhaus and published by Springer. This book was released on 2018-01-17 with total page 521 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book fills a gap between many of the basic solid state physics and materials sciencebooks that are currently available. It is written for a mixed audience of electricalengineering and applied physics students who have some knowledge of elementaryundergraduate quantum mechanics and statistical mechanics. This book, based on asuccessful course taught at MIT, is divided pedagogically into three parts: (I) ElectronicStructure, (II) Transport Properties, and (III) Optical Properties. Each topic is explainedin the context of bulk materials and then extended to low-dimensional materials whereapplicable. Problem sets review the content of each chapter to help students to understandthe material described in each of the chapters more deeply and to prepare them to masterthe next chapters.
