Download or read book Optical Properties of Two Dimensional Semiconductors written by Elizabeth Joan McCormick and published by . This book was released on 2018 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two dimensional materials (2D) have become a huge research focus in recent history due to the interesting properties and phenomena that occur with reduced dimensionality. Additionally, the reduced size of these materials, the plethora of different properties available in the 2D arsenal, and the ability to relatively easily combine different 2D materials makes them extremely promising for nanodevices and future computing architectures. Here, we investigate the optical properties of two different 2D semiconductors, germanane and transition metal dichalcogenides (TMDs).

Download or read book Electronic and Optical Properties of Two dimensional Semiconductors written by Matthias Drüppel and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Optical Properties of Two Dimensional Semiconductors and Carbon Hybrid Structures written by and published by . This book was released on 2015 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Two Dimensional Semiconductors written by Jingbo Li and published by John Wiley & Sons. This book was released on 2020-03-10 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: In-depth overview of two-dimensional semiconductors from theoretical studies, properties to emerging applications! Two-dimensional (2D) materials have attracted enormous attention due to their exotic properties deriving from their ultrathin dimensions. 2D materials, such as graphene, transition metal dichalcogenides, transition metal oxides, black phosphorus and boron nitride, exhibit versatile optical, electronic, catalytic and mechanical properties, thus can be used in a wide range of applications, including electronics, optoelectronics and optical applications. Two-Dimensional Semiconductors: Synthesis, Physical Properties and Applications provides an in-depth view of 2D semiconductors from theoretical studies, properties to applications, taking into account the current state of research and development. It introduces various preparation methods and describes in detail the physical properties of 2D semiconductors including 2D alloys and heterostructures. The covered applications include, but are not limited to, field-effect transistors, spintronics, solar cells, photodetectors, light-emitting diode, sensors and bioelectronics. Highly topical: 2D materials are a rapidly advancing field that attracts increasing attention Concise overview: covers theoretical studies, preparation methods, physical properties, potential applications, the challenges and opportunities Application oriented: focuses on 2D semiconductors that can be used in various applications such as field-effect transistors, solar cells, sensors and bioelectronics Highly relevant: newcomers as well as experienced researchers in the field of 2D materials will benefit from this book Two-Dimensional Semiconductors: Synthesis, Physical Properties and Applications is written for materials scientists, semiconductor and solid state physicists, electrical engineers, and readers working in the semiconductor industry.

Download or read book Growth and Optical Properties of Wide Gap II VI Low Dimensional Semiconductors written by T.C. McGill and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the Proceedings of the NATO Advanced Research Workshop on "Growth and Optical Properties of Wide Gap II-VI Low Dimensional Semiconductors", held from 2 - 6 August 1988 in Regensburg, Federal Republic of Germany, under the auspices of the NATO International Scientific Exchange Programme. Semiconducting compounds formed by combining an element from column II of the periodic table with an element from column VI (so called II-VI Semiconductors) have long promised many optoelectronic devices operating in the visible region of the spectrum. However, these materials have encountered numerous problems including: large number of defects and difficulties in obtaining p- and n-type doping. Advances in new methods of material preparation may hold the key to unlocking the unfulfilled promises. During the workshop a full session was taken up covering the prospects for wide-gap II-VI Semiconductor devices, particularly light emitting ones. The growth of bulk materials was reviewed with the view of considering II-VI substrates for the novel epitaxial techniques such as MOCVD, MBE, ALE, MOMBE and ALE-MBE. The controlled introduction of impurities during non-equilibrium growth to provide control of the doping type and conductivity was emphasized.

Download or read book Optical and Electro Optical Properties of Two Dimensional Semiconductors written by Carlos Gutierrez Garcia and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two-dimensional (2D) materials have recently caught much attention due to their exceptional properties and their potential applications in opto-electronics. Graphene, transition metal dichalcogenides (TMDs), and black phosphorus (b-P) are some of the main candidates from the 2D material family that show great promise in their ability to have properties such as high mobility, anisotropy, desirable band gap, and many more. Here, we'll discuss some of the history of these 2D semiconductors and some of the properties that make them unique and interesting. This will be focusing on the electrical and opto-electrical properties of 2D semiconductors in measurements conducted during my graduate research studies. Some of these measurements include 2-terminal and 4-terminal contact configurations, photoconductivity, transport, photoluminescence, and Raman spectroscopy. The 2D semiconductors used in these experiments are post-graphene such as TMDs, post transition metals, and b-P. The photoconductivity was measured on few-layered WSe$_{2}$ field-effect transistors (FETs) using both 2-terminal and 4-terminal configurations under 532~nm laser source. For an incident laser power of 248 nW, we extracted 18 A/W and $\sim$4000\% for the two-terminal responsivity (R) and an external quantum efficiency (EQE) respectively, when a bias voltage $V_{ds}$ = 1 V and a gate voltage $V_{bg}$ = 10 V were applied to the sample. R and EQE saw an increase by 370\% to $\sim$85 A/W and $\sim$20000\% respectively, when using a four-terminal configuration. The photogating effect was observed in our few-layered (3-4 layers) ReS$_{2}$ FETs in which varying the incident optical power shifted the FETs' threshold voltage. The photogating effect produced a significant gain in the electrical response of the FETs to incident light as measured by R and EQE. We obtained a maximum R of 45 A/W corresponding to an EQE of $\sim$10500\% in a 4-terminal measurement of the photoconductivity in the ON-state. We attribute both the photogating and the observed gain to the influence of charge traps. We also presented a detailed study on the Raman spectra and on the temperature dependence of the electrical transport properties of arsenic-doped black phosphorus (b-AsP) with an As fraction of x = 0.25. Field-effect transistors fabricated from few-layered b-AsP exfoliated onto Si/SiO$_{2}$ substrates exhibited hole-doped like conduction with a room temperature ON/OFF current ratio of $\sim$10$^{3}$ and an intrinsic field-effect mobility approaching $\sim$300 cm$^{2}$V$^{-1}$s$^{-1}$ at 300 K which increases up to 600 cm$^{2}$V$^{-1}$s$^{-1}$ at 100 K when measured via a 4-terminal method. The ON to OFF current ratio is observed to increase up to 10$^{5}$ at 4 K. Similarly to pristine b-P, its transport properties revealed a high anisotropy between armchair and zig-zag directions. Photoluminescence (PL) and transport measurements were conducted on vanadium-doped InSe FETs using 2-terminal configuration under 532 nm and 785 nm excitation. Low temperature measurements were also studied ranging from 295 K to $\sim$13 K in a cryostat. Transport measurements showed little to no current when drain-source and back-gate voltages were applied and under low temperature. Low temperature PL showed blue-shifted peaks at T $>$ 50 K and red-shifted peaks at T $

Download or read book 2D Materials for Nanophotonics written by Young Min Jhon and published by Elsevier. This book was released on 2020-11-29 with total page 413 pages. Available in PDF, EPUB and Kindle. Book excerpt: 2D Materials for Nanophotonics presents a detailed overview of the applications of 2D materials for nanophotonics, covering the photonic properties of a range of 2D materials including graphene, 2D phosphorene and MXenes, and discussing applications in lighting and energy storage. This comprehensive reference is ideal for readers seeking a detailed and critical analysis of how 2D materials are being used for a range of photonic and optical applications. - Outlines the major photonic properties in a variety of 2D materials - Demonstrates major applications in lighting and energy storage - Explores the challenges of using 2D materials in photonics

Download or read book Optical Properties of Narrow Gap Low Dimensional Structures written by Clivia M. Sotomayor Torres and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 357 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the Proceedings of the NATO Advanced Research Workshop on "Optical Properties of Narrow-Gap Low-Dimensional Structures", held from July 29th to August 1st, 1986, in St. Andrews, Scotland, under the auspices of the NATO International Scientific Exchange Program. The workshop was not limited to optical properties of narrow-gap semiconductor structures (Part III). Sessions on, for example, the growth methods and characterization of III-V, II-VI, and IV-VI materials, discussed in Part II, were an integral part of the workshop. Considering the small masses of the carriers in narrow-gap low dimensional structures (LOS), in Part I the enhanced band mixing and magnetic field effects are explored in the context of the envelope function approximation. Optical nonlinearities and energy relaxation phenomena applied to the well-known systems of HgCdTe and GaAs/GaAIAs, respectively, are reviewed with comments on their extension to narrow gap LOS. The relevance of optical observations in quantum transport studies is illustrated in Part IV. A review of devices based on epitaxial narrow-gap materials defines a frame of reference for future ones based on two-dimensional narrow-gap semiconductors; in addition, an analysis of the physics of quantum well lasers provides a guide to relevant parameters for narrow-gap laser devices for the infrared (Part V). The roles and potentials of special techniques are explored in Part VI, with emphasis on hydrostatic pressure techniques, since this has a pronounced effect in small-mass, narrow-gap, non-parabolic structures.

Download or read book Optical Properties of Two dimensional Semiconductor Heterostructures written by Louis Bernard Allard and published by . This book was released on 1993 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: For the most part of this work, we study the effects of focused ion beam implantation in InGaAs/GaAs quantum well structures.

Download or read book Optical Properties of 2D Systems with Interacting Electrons written by Wolfgang J. Ossau and published by Springer. This book was released on 2003-10-31 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the NATO Advanced Research Workshop, held in St. Petersburg, Russia, 13-16 June 2002

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 Optical Properties of Semiconductor Nanostructures written by Marcin L. Sadowski and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 443 pages. Available in PDF, EPUB and Kindle. Book excerpt: Optical methods for investigating semiconductors and the theoretical description of optical processes have always been an important part of semiconductor physics. Only the emphasis placed on different materials changes with time. Here, a large number of papers are devoted to quantum dots, presenting the theory, spectroscopic investigation and methods of producing such structures. Another major part of the book reflects the growing interest in diluted semiconductors and II-IV nanosystems in general. There are also discussions of the fascinating field of photonic crystals. `Classical' low dimensional systems, such as GsAs/GaAlAs quantum wells and heterostructures, still make up a significant part of the results presented, and they also serve as model systems for new phenomena. New materials are being sought, and new experimental techniques are coming on stream, in particular the combination of different spectroscopic modalities.

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.

Download or read book The Physics of Low dimensional Semiconductors written by John H. Davies and published by Cambridge University Press. This book was released on 1998 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: The composition of modern semiconductor heterostructures can be controlled precisely on the atomic scale to create low-dimensional systems. These systems have revolutionised semiconductor physics, and their impact on technology, particularly for semiconductor lasers and ultrafast transistors, is widespread and burgeoning. This book provides an introduction to the general principles that underlie low-dimensional semiconductors. As far as possible, simple physical explanations are used, with reference to examples from actual devices. The author shows how, beginning with fundamental results from quantum mechanics and solid-state physics, a formalism can be developed that describes the properties of low-dimensional semiconductor systems. Among numerous examples, two key systems are studied in detail: the two-dimensional electron gas, employed in field-effect transistors, and the quantum well, whose optical properties find application in lasers and other opto-electronic devices. The book includes many exercises and will be invaluable to undergraduate and first-year graduate physics or electrical engineering students taking courses in low-dimensional systems or heterostructure device physics.

Download or read book Quantum Theory of the Optical and Electronic Properties of Semiconductors written by Hartmut Haug and published by World Scientific Publishing Company. This book was released on 1994-10-31 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt: This textbook presents the basic elements needed to understand and engage in research in semiconductor physics. It deals with elementary excitations in bulk and low-dimensional semiconductors, including quantum wells, quantum wires and quantum dots. The basic principles underlying optical nonlinearities are developed, including excitonic and many-body plasma effects. The fundamentals of optical bistability, semiconductor lasers, femtosecond excitation, optical Stark effect, semiconductor photon echo, magneto-optic effects, as well as bulk and quantum-confined Franz-Keldysh effects are covered. The material is presented in sufficient detail for graduate students and researchers who have a general background in quantum mechanics. Request Inspection Copy

Download or read book Theory and Simulation of Electronic and Optical Properties of Charged Defects in Two dimensional Semiconductors written by Martik Aghajanian and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: