Growth Mechanism And Interfacial Electronic Properties Of Graphene And Silicene Two Dimensional Semiconductor Materials
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Growth Mechanism And Interfacial Electronic Properties Of Graphene And Silicene Two Dimensional Semiconductor Materials
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Author : Kun Chen (Ph. D.)
language : en
Publisher:
Release Date : 2013
Growth Mechanism And Interfacial Electronic Properties Of Graphene And Silicene Two Dimensional Semiconductor Materials written by Kun Chen (Ph. D.) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Compound semiconductors categories.
The aforementioned four sub-topics form the mechanistic understanding of graphene growth by PAHs and interfacial electronic properties of graphene and silicene down to the molecular level.
Structural And Electronic Properties Of Two Dimensional Silicene Graphene And Related Structures
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Author : Ruiping Zhou
language : en
Publisher:
Release Date : 2012
Structural And Electronic Properties Of Two Dimensional Silicene Graphene And Related Structures written by Ruiping Zhou and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Density functionals categories.
Traditional CMOS (complementary metal-oxide-semiconductor) transistors have already been in the nanometer range. As bulk silicon material is approaching its physical limits, it is highly desirable to seek novel, functional materials to continue Moore's law. Two-dimensional(2D) materials, such as graphene and silicene, have attracted great attention since they were envisioned a few years ago, having extraordinary electrical properties. Research in this work was focused on understanding the structural and electronic properties of a few atomic layers of carbon (graphene) and silicon (silicene). Atomic structures of the 2D materials, corresponding band structures, and transport properties were calculated based on density functional theory. Band gap was observed in AB forwardly-stacked bilayer silicene with proper layer distance. Applying an external electric field resulted in further opening of the band gap up to 0.19 eV. In addition, transmission spectrum and I-V curves were calculated. A new structure of a thin silicon layer on graphene substrate is proposed, showing different transport properties from 2D silicene.
Exploring Two Dimensional Graphene And Silicene In Digital And Rf Applications
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Author : Zhonghang Ji
language : en
Publisher:
Release Date : 2019
Exploring Two Dimensional Graphene And Silicene In Digital And Rf Applications written by Zhonghang Ji and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Electrical engineering categories.
Since the discovery of graphene, two-dimensional (2D) materials have attracted intensive interests in the past 15 years and there has been a growing interest in exploring new materials beyond graphene, such as silicene, germanene, etc. Numerous papers have been published to demonstrate their extraordinary electronic, optical, biological, and thermal properties which render broad applications in various fields. However, the absence of band gap in graphene and silicene prohibits their uses in digital applications. This dissertation reviews recent progress on band gap opening based on mono- and bi- layer silicene and presents a new silicon atomic structure which exhibits a 0.17 eV bandgap. In addition, a feasible approach was first demonstrated and proposed to potentially achieve the industrial-scale production of our simulated structure. More broadly, this approach suggests a new path for growing any materials on different substrates without forming chemical bond between the interaction layers.Although the gapless character of graphene prohibits its use in digital applications, it is not a concern for Radio Frequency (RF) applications. This work also investigated the impact of defects to RF electronic properties of the 2D materials. Chemical vapor deposited Graphene (CVDG) was selected as an example and was measured using scanning microwave microscopy (SMM). In order to analyze the result, a numerical model of SMM was first developed using Electromagnetic Professional (EMPro). From the results, both conductivity and permittivity of defective graphene exhibit the frequency-dependency properties. Additionally, the model we proposed in this work can precisely characterize the correlation between conductivity and permittivity of any materials in nanoscale at RF level.
Two Dimensional Materials
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Author : Pramoda Kumar Nayak
language : en
Publisher: BoD – Books on Demand
Release Date : 2016-08-31
Two Dimensional Materials written by Pramoda Kumar Nayak and has been published by BoD – Books on Demand this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-08-31 with Technology & Engineering categories.
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.
2d Monoelemental Materials Xenes And Related Technologies
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Author : Zongyu Huang
language : en
Publisher: CRC Press
Release Date : 2022-04-19
2d Monoelemental Materials Xenes And Related Technologies written by Zongyu Huang and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-04-19 with Science categories.
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.
Materials Synthesis Of And Electrical Contacts With Two Dimensional Materials
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Author : Cheng Gong
language : en
Publisher:
Release Date : 2013
Materials Synthesis Of And Electrical Contacts With Two Dimensional Materials written by Cheng Gong and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Density functionals categories.
Two-dimensional (2D) materials have attracted a lot of interest in both academia and industry in the past decade, mainly because of their superior electrical properties and the rich platform they provide to explore fundamental physics. Graphene, as a 2D semimetal with ultrahigh room-temperature carrier mobility (200,000 cm2V-1S-1), is expected to contribute to high-speed devices. Transition metal dichalcogenides (TMDs), with sizable electronic band gaps, have great potential for logic devices. Furthermore, in all electronic devices based on these new materials, metal contacts are intrinsic components, critical in nanoscale devices for both electronic transport and heat dissipation. Therefore, material synthesis and the impact of metal deposition are both fundamental issues for the fabrication of devices based on 2D materials. This dissertation focuses on synthesis of and metal deposition on 2D materials. First, several strategies for the preparation of large-area clean graphene film are explored. Then, the nature of interfaces formed upon metal deposition is investigated on both graphene and TMDs. For metal contacts with graphene, the interface electronic properties are elucidated by density functional theory (DFT) calculations and Raman spectroscopy, and the specific interface bonding configurations obtained upon the deposition of wetting metals are explored by in-situ X-ray photoelectron spectroscopy. For metal contacts with MoS2, the metal adsorption and the resulting Fermi level pinning are studied by Raman spectroscopy, atomic force microscopy, and DFT calculations. These joint experimental-theoretical studies uncover the interaction mechanisms at the interface between metal films and 2D materials, and make it possible to examine optimization strategies for device applications.
Atomic Scale Imaging Of The Electronic Structure And Chemistry Of Graphene And Its Precursors On Metal Surfaces
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Author :
language : en
Publisher:
Release Date : 2015
Atomic Scale Imaging Of The Electronic Structure And Chemistry Of Graphene And Its Precursors On Metal Surfaces written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Executive Summary of Final Report for Award DE-FG02-88ER13937 Project Title: Atomic Scale Imaging of the Electronic Structure and Chemistry of Graphene and its Precursors on Metal Surfaces Applicant/Institution: Columbia University Principal Investigator: George W. Flynn Objectives: The objectives of this project were to reveal the mechanisms and reaction processes that solid carbon materials undergo when combining with gases such as oxygen, water vapor and hydrocarbons. This research was focused on fundamental chemical events taking place on single carbon sheets of graphene, a two-dimensional, polycyclic carbon material that possesses remarkable chemical and electronic properties. Ultimately, this work is related to the role of these materials in mediating the formation of polycyclic aromatic hydrocarbons (PAH's), their reactions at interfaces, and the growth of soot particles. Our intent has been to contribute to a fundamental understanding of carbon chemistry and the mechanisms that control the formation of PAH's, which eventually lead to the growth of undesirable particulates. We expect increased understanding of these basic chemical mechanisms to spur development of techniques for more efficient combustion of fossil fuels and to lead to a concomitant reduction in the production of undesirable solid carbon material. Project Description: Our work treated specifically the surface chemistry aspects of carbon reactions by using proximal probe (atomic scale imaging) techniques to study model systems of graphene that have many features in common with soot forming reactions of importance in combustion flames. Scanning tunneling microscopy (STM) is the main probe technique that we used to study the interfacial structure and chemistry of graphene, mainly because of its ability to elucidate surface structure and dynamics with molecular or even atomic resolution. Scanning tunneling spectroscopy (STS), which measures the local density of quantum states over a single atom, provides information about the electronic structure of graphene and is particularly sensitive to the sign and magnitude of the charge transfer between graphene and any surface adsorbed species. Results: (A) Graphene on SiO2 In an effort designed to unravel aspects of the mechanisms for chemistry on graphene surfaces, STM and STS were employed to show that graphene on SiO2 is oxidized at lower temperatures than either graphite or multi-layer graphene. Two independent factors control this charge transfer: (1) the degree of graphene coupling to the substrate, and (2) exposure to oxygen and moisture. (B) Graphene on Copper In the case of graphene grown on copper surfaces, we found that the graphene grows primarily in registry with the underlying copper lattice for both Cu(111) and Cu(100). On Cu(111) the graphene has a hexagonal superstructure with a significant electronic component, whereas it has a linear superstructure on Cu(100). (C) Nitrogen Doped Graphene on Copper Using STM we have also studied the electronic structure and morphology of graphene films grown on a copper foil substrate in which N atoms substitute for carbon in the 2-D graphene lattice. The salient features of the results of this study were: (1) Nitrogen doped graphene on Cu foil exhibits a triangular structure with an "apparent" slight elevation of ~ 0.8 Å at N atom substitution sites; (2) Nitrogen doping results in ~0.4 electrons per N atom donated to the graphene lattice; (3) Typical N doping of graphene on Cu foil shows mostly single site Carbon atom displacement (~ 3N/1000C); (4) Some multi-site C atom displacement is observed (
2d Materials
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Author : Phaedon Avouris
language : en
Publisher: Cambridge University Press
Release Date : 2017-06-29
2d Materials written by Phaedon Avouris and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-06-29 with Science categories.
A comprehensive and accessible introduction to 2D materials, covering basic physics, electronic and optical properties, and potential applications.
Two Dimensional Materials For Novel Electronic Applications
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Author : Matthew Hollander
language : en
Publisher:
Release Date : 2015
Two Dimensional Materials For Novel Electronic Applications written by Matthew Hollander and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
First successfully isolated in 2004, graphene is a two-dimensional crystal comprised of a one-atom thick layer of carbon atoms arranged in a honeycomb lattice. Initial demonstrations of the exceptional material and electronic properties of graphene sparked a period of accelerated research and investigation into two-dimensional material systems and the unique properties they offer. During this period, there have been continuous breakthroughs with regard to isolation, growth, and characterization of two-dimensional systems, enabling the number of known two-dimensional and layered materials to rapidly expand. As the number of two-dimensional and layered material systems investigated increases, so too does the number of potential applications. Currently, there exist several fundamental questions as to the role these materials might play in future electronic applications. As an example, graphene has been suggested for use as the channel material in high frequency transistors due to its exceptionally high carrier mobility, but also as an interconnect for integrated circuits due to its excellent thermal properties and ability to support very high current densities. Furthermore, there exist several fundamental challenges to implementing graphene and other two dimensional materials in many of the proposed applications. For the case of graphene this includes high contact resistivities and the inability to control edge morphology in highly scaled geometries.This dissertation focuses specifically on the two-dimensional materials of graphene and tantalum di-sulfide in an attempt to elucidate some of the potential applications and challenges facing these two materials. It addresses several issues related to the development of a graphene based transistor for use in high frequency applications and the optimization of the graphene based transistor for mixing applications, including an analysis of graphene mixer design and the use of graphene nano-ribbon geometries to mitigate contact effects in highly scaled devices. In the final portion of the dissertation, the layered two-dimensional material 1T-TaS2 is explored for potential applications in electronics, where use of its insulator-metal-transition could be utilized to implement a steep-slope transistor in order to overcome conventional constraints which currently limit performance of highly scaled silicon transistors.
2d Nanoscale Heterostructured Materials
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Author : Satyabrata Jit
language : en
Publisher: Elsevier
Release Date : 2020-05-09
2d Nanoscale Heterostructured Materials written by Satyabrata Jit and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-05-09 with Technology & Engineering categories.
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