Electrical And Optoelectronic Properties Of The Nanodevices Composed Of Two Dimensional Materials

Author : Cheng-Hua Liu
Publisher : Springer
ISBN 13 : 9811313555
Total Pages : 74 pages
Book Rating : 4.54/5 ( download)

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Download or read book Electrical and Optoelectronic Properties of the Nanodevices Composed of Two-Dimensional Materials written by Cheng-Hua Liu and published by Springer. This book was released on 2018-08-22 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis focuses on the transport and magneto-transport properties of graphene p-n-p junctions, such as the pronounced quantum Hall effect, a well-defined plateau–plateau transition point, and scaling behavior. In addition, it demonstrates persistent photoconductivity (PPC) in the monolayer MoS2 devices, an effect that can be attributed to random localized potential fluctuations in the devices. Further, it studies scaling behavior at zeroth Landau level and high performance of fractional values of quantum Hall plateaus in these graphene p-n-p devices. Moreover, it demonstrates a unique and efficient means of controlling the PPC effect in monolayer MoS2. This PPC effect may offer novel functionalities for MoS2-based optoelectronic applications in the future.

Author : Qiaoliang Bao
Publisher : Woodhead Publishing
ISBN 13 : 0128154357
Total Pages : 336 pages
Book Rating : 4.59/5 ( download)

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Download or read book 2D Materials for Photonic and Optoelectronic Applications written by Qiaoliang Bao and published by Woodhead Publishing. This book was released on 2019-10-19 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: 2D Materials for Photonic and Optoelectronic Applications introduces readers to two-dimensional materials and their properties (optical, electronic, spin and plasmonic), various methods of synthesis, and possible applications, with a strong focus on novel findings and technological challenges. The two-dimensional materials reviewed include hexagonal boron nitride, silicene, germanene, topological insulators, transition metal dichalcogenides, black phosphorous and other novel materials. This book will be ideal for students and researchers in materials science, photonics, electronics, nanotechnology and condensed matter physics and chemistry, providing background for both junior investigators and timely reviews for seasoned researchers. Provides an in-depth look at boron nitride, silicene, germanene, topological insulators, transition metal dichalcogenides, and more Reviews key applications for photonics and optoelectronics, including photodetectors, optical signal processing, light-emitting diodes and photovoltaics Addresses key technological challenges for the realization of optoelectronic applications and comments on future solutions

Author : Youngwoo Son (Ph. D.)
Publisher :
ISBN 13 :
Total Pages : 143 pages
Book Rating : 4.73/5 ( download)

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Download or read book Understanding and Engineering Electronic and Optoelectronic Properties of 2D Materials and Their Interfaces written by Youngwoo Son (Ph. D.) and published by . This book was released on 2016 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the pursuit of further miniaturization beyond Moore's law, tremendous effort has been dedicated to exploring the potential of two-dimensional (2D) materials for nanoscale electronic devices. 2D materials are a group of solid state materials that possess strong in-plane covalent bonds while individual atomic layers are held together by weak van der Waals (vdW) interactions. Hence, their bulk crystals can be exfoliated into few-layer or even atomically thin single-layers via micro-mechanical exfoliation techniques. These materials possess unique and exotic properties due to quantum confinement of importance to future electronics. However, many technical problems need to be solved to realize this goal. For example, as 2D material based devices become smaller down to the nanometer scale, the electrical contacts must also be reduced in scale which creates different characteristics from those of macroscopic counterparts. In addition, there are issues of reliability and stability with devices comprised of such materials. There is a need to understand the electronic and chemical properties of several interfaces that arise in such materials: metal-2D and 2D-2D junctions, for example. To this end, this thesis focuses on understanding nanoscale metal-2D semiconductor (SC) and 2D SC-2D SC junctions exploring: (1) electronic and optoelectronic behavior at the nanoscale junction of metal-MoS2 and dependence on the layer number (thickness), (2) realization of voltage selectable photodiodes based on a lateral in-plane MoS2-WSe2 heterojunctions, and (3) interfacial properties and (opto)electronic characteristics of a phosphorene-MoS2 vertical vdW p-n junction. The first part of this thesis explores the layer number dependent electrical characteristics of the MoS2-metal nanoscale junction using current imaging of MoS2 nanosheets consisting of regions of varying different thicknesses using conductive and photoconductive spectral atomic force microscopy (C- and PCS-AFM). The layer number dependence of the effective barrier was measured, by obtaining consecutive current images while changing bias voltages, showing it to be linear. At the same time, spatially resolved two-dimensional (2D) maps of local electrical properties are generated from simultaneously recorded local current-voltage (IV) data. Furthermore, the layer number dependent spectral photoresponse of MoS2 is investigated, which shows the highest response in single layer (1L) region. The photoresponse decreases for increasing layer number, but increases again between 4L and 1 OL due to increased light absorption. The photoresponse is also strongly dependent on the wavelength of the incident light, showing much higher currents for photon energies that are above the optical bandgap. The photoresponse in forward and reverse biases shows barrier symmetry for 1 L but asymmetry for 2, 3, and 4L, which further indicates a dominant role of the barrier on carrier transport at the junction. The second part of this thesis investigates the spatially resolved transverse electrical properties of the monolayer WSe2 -MoS2 lateral p-n heterostructures at their nanoscale junctions with metals both in the dark and under laser illumination. As in the first part of the thesis, C- and PCS-AFM, versatile tools to conveniently and efficiently interrogate layer-dependent electronic and optoelectronic characteristics in a MoS2 crystal containing regions of different thicknesses, which enables direct characterization and comparison of the different layer regions without the complexities associated with fabricating and testing of different individual field-effect transistor devices, are used for measurements. By performing current imaging using a PtIr-coated conductive tip on an ultrathin nanosheet that includes homogeneous crystals of WSe2 and MoS2 and a lateral junction region in between, many thousands of WSe2/MoS2/the junction-metal contact points form during imaging and directly compare their local properties at the same time under identical experimental conditions with the nanoscale spatial resolution. The third part of this thesis explores a new type of 2D vertical heterostructures that simultaneously possess desirable properties of constituent materials, paving the path for overcoming intrinsic shortcomings of each component material to be used as an active material in nanoelectronic devices. As a first example, a MoS 2-graphene vertical heterostructure is constructed and its charge transfer and photoluminescence (PL) at the interface are investigated. C-AFM and Raman spectroscopy show that there is a significant charge transfer between the two component materials. The PL intensity of monolayer MoS2 is noticeably quenched when in contact with a single layered graphene in comparison to that of a bare monolayer MoS2 crystal. Then, with the acquired understanding of the underlying physics at the 2D vdW heterointerfaces, the possibility of a black phosphorus (BP)-MoS2 vertical heterostructure as an ultrathin channel material for high-performance 2D (opto)electronic devices is studied. CVD-synthesized MoS2 and micromechanically exfoliated BP crystals are stacked together to form a vertical p-n heterostructure. Optical microscopy, AFM images, and Raman spectroscopy data show that the MoS2 thin films can be used as a passivation layer, protecting BP from deteriorating in ambient conditions for extended period of time or under an elevated temperature in an Ar environment. The IV characteristics of FET devices based on the vertical heterostuctures exhibit that the MoS2 layer has limited impact on superior carrier transport properties of the BP in the dark. Upon light illumination, photoconductivity of the BP-MoS2 heterostructure region increased compared to that of the bare BP region of the same flake, mainly due to the fact that a built-in electric field formed at the BP-MoS2 interface facilitates the dissociation of electron-hole pairs generated by light absorption.

Author : Yoke Khin Yap
Publisher : MDPI
ISBN 13 : 3038424927
Total Pages : 153 pages
Book Rating : 4.25/5 ( download)

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Download or read book Two-Dimensional Electronics and Optoelectronics written by Yoke Khin Yap and published by MDPI. This book was released on 2018-04-03 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a printed edition of the Special Issue "Two-Dimensional Electronics and Optoelectronics" that was published in Electronics

Author : Qiaoming Wang
Publisher :
ISBN 13 :
Total Pages : 141 pages
Book Rating : 4.62/5 ( download)

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Download or read book Electrical and Optoelectronic Properties of Two-dimensional Materials written by Qiaoming Wang and published by . This book was released on 2016 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: New van der Waals metal-semiconductor junctions have been mechanically constructed and systematically studied. The photocurrent on junction area has been demonstrated to originate from the photothermal effect rather than the photovoltaic effect.

Author : Arun Kumar Singh
Publisher : CRC Press
ISBN 13 : 1000783006
Total Pages : 260 pages
Book Rating : 4.01/5 ( download)

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Download or read book Emerging Two Dimensional Materials and Applications written by Arun Kumar Singh and published by CRC Press. This book was released on 2022-11-21 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book details 2D nanomaterials, and their important applications—including recent developments and related scalable technologies crucial to addressing strong societal demands of energy, environmental protection, and worldwide health concerns—are systematically documented. It covers syntheses and structures of various 2D materials, electrical transport in graphene, and different properties in detail. Applications in important areas of energy harvesting, energy storage, environmental monitoring, and biosensing and health care are elaborated. Features: Facilitates good understanding of concepts of emerging 2D materials and its applications. Covers details of highly sensitive sensors using 2D materials for environmental monitoring. Outlines the role of 2D materials in improvement of energy harvesting and storage. Details application in biosensing and health care for the realization of next-generation biotechnologies for personalized health monitoring and so forth. Provides exclusive coverage of inorganic 2D MXenes compounds. This book is aimed at graduate students and researchers in materials science and engineering, nanoscience and nanotechnology, and electrical engineering.

Author : Satyabrata Jit
Publisher : Elsevier
ISBN 13 : 0128176792
Total Pages : 285 pages
Book Rating : 4.95/5 ( download)

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Download or read book 2D Nanoscale Heterostructured Materials written by Satyabrata Jit and published by Elsevier. This book was released on 2020-05-09 with total page 285 pages. Available in PDF, EPUB and Kindle. Book excerpt: 2D Nanoscale Heterostructured Materials: Synthesis, Properties, and Applications assesses the current status and future prospects for 2D materials other than graphene (e.g., BN nanosheets, MoS2, NbSe2, WS2, etc.) that have already been contemplated for both low-end and high-end technological applications. The book offers an overview of the different synthesis techniques for 2D materials and their heterostructures, with a detailed explanation of the many potential future applications. It provides an informed overview and fundamentals properties related to the 2D Transition metal dichalcogenide materials and their heterostructures. The book helps researchers to understand the progress of this field and points the way to future research in this area. Explores synthesis techniques of newly evolved 2D materials and their heterostructures with controlled properties Offers detailed analysis of the fundamental properties (via various experimental process and simulations techniques) of 2D heterostructures materials Discusses the applications of 2D heterostructured materials in various high-performance devices

Author : Minas M. Stylianakis
Publisher : MDPI
ISBN 13 : 303928696X
Total Pages : 338 pages
Book Rating : 4.66/5 ( download)

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Download or read book Optoelectronic Nanodevices written by Minas M. Stylianakis and published by MDPI. This book was released on 2020-04-15 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the last decade, novel graphene related materials (GRMs), perovskites, as well as metal oxides and other metal nanostructures have received the interest of the scientific community. Due to their extraordinary physical, optical, thermal, and electrical properties, which are correlated with their 2D ultrathin atomic layer structure, large interlayer distance, ease of functionalization, and bandgap tunability, these nanomaterials have been applied in the development or the improvement of innovative optoelectronic applications, as well as the expansion of theoretical studies and simulations in the fast-growing fields of energy (photovoltaics, energy storage, fuel cells, hydrogen storage, catalysis, etc.), electronics, photonics, spintronics, and sensing devices. The continuous nanostructure-based applications development has provided the ability to significantly improve existing products and to explore the design of materials and devices with novel functionalities. This book demonstrates some of the most recent trends and advances in the interdisciplinary field of optoelectronics. Most articles focus on light emitting diodes (LEDs) and solar cells (SCs), including organic, inorganic, and hybrid configurations, whereas the rest address photodetectors, transistors, and other well-known dynamic optoelectronic devices. In this context, this exceptional collection of articles is directed at a broad scientific audience of chemists, materials scientists, physicists, and engineers, with the goals of highlighting the potential of innovative optoelectronic applications incorporating nanostructures and inspiring their realization.

Author : Phaedon Avouris
Publisher : Cambridge University Press
ISBN 13 : 1316738132
Total Pages : 521 pages
Book Rating : 4.39/5 ( download)

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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.

Author : Antonio Di Bartolomeo
Publisher : MDPI
ISBN 13 : 3039287680
Total Pages : 170 pages
Book Rating : 4.80/5 ( download)

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Download or read book 2D Materials and Van der Waals Heterostructures written by Antonio Di Bartolomeo and published by MDPI. This book was released on 2020-06-23 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: The advent of graphene and, more recently, two-dimensional materials has opened new perspectives in electronics, optoelectronics, energy harvesting, and sensing applications. This book, based on a Special Issue published in Nanomaterials – MDPI covers experimental, simulation, and theoretical research on 2D materials and their van der Waals heterojunctions. The emphasis is the physical properties and the applications of 2D materials in state-of-the-art sensors and electronic or optoelectronic devices.