Effects of Process Tube Position on Properties of Graphene Layers

2012 ◽  
Vol 1451 ◽  
pp. 57-62 ◽  
Author(s):  
Zafer Mutlu ◽  
Miroslav Penchev ◽  
Isaac Ruiz ◽  
Hamed Hosseini Bay ◽  
Shirui Guo ◽  
...  
Keyword(s):  
Large Scale ◽  
Growth Parameters ◽  
Industrial Applications ◽  
Quartz Tube ◽  
Large Area ◽  
High Quality ◽  
Practical Applications ◽  
Graphene Layers ◽  
Vis Spectroscopy ◽  
Tube Position

ABSTRACTGraphene, with unique electrical, optical and mechanical properties is a promising material in industrial applications, such as batteries, supercapacitors, transistors and semiconductor devices. These potential applications of graphene have motivated the development of large-scale synthesis of graphene on copper substrates by chemical vapor deposition (CVD). To enable practical applications of large-area, high quality graphene layers at the centimeter and wafer scales, process control needs to be implemented for optimizing the morphology and electrical properties and enable repeatable growth-cycle of graphene layers for process-line implementation. Here we investigate the effects of process quartz-tube position on the structural properties of graphene. Furthermore, we describe a procedure for process optimization of the growth parameters. Graphene is grown on copper foils by CVD, and transferred to the SiO2/Si and glass substrates. The detailed characterization of the graphene layers are conducted using Raman spectroscopy, optical microscopy (OM), scanning electron microscopy (SEM) and UV-vis spectroscopy. The experimental results show that the position of copper foil into the quartz tube plays a significant role in the Raman features of the graphene, and influences the optical, morphology and surface properties of graphene layers. We believe that these results will be useful for determining the optimum processing conditions of high quality graphene layers at the centimeter and wafer scales.

Diamond Films: Recent Developments

MRS Bulletin ◽  
1998 ◽  
Vol 23 (9) ◽  
pp. 16-21 ◽  
Author(s):  
Dieter M. Gruen ◽  
Ian Buckley-Golder
Keyword(s):  
High Temperature ◽  
Integrated Circuits ◽  
Nuclear Power ◽  
Large Scale ◽  
Diamond Films ◽  
Chemical Vapor ◽  
Large Area ◽  
Technical Problems ◽  
Practical Applications ◽  
Single Crystal Diamond

Carbon in the form of diamond is the stuff of dreams, and the image of the diamond evokes deep and powerful emotions in humans. Following the successful synthesis of diamond by high-pressure methods in the 1950s, the startling development of the low-pressure synthesis of diamond films in the 1970s and 1980s almost immediately engendered great expectations of utility. The many remarkable properties of diamond due in part to its being the most atomically dense material in the universe (hardness, thermal conductivity, friction coefficient, transparency, etc.) could at last be put to use in a multitude of practical applications. “The holy grail”—it was realized early on—would be the development of large-area, doped, single-crystal diamond wafers for the fabrication of high-temperature, extremely fast integrated circuits leading to a revolution in computer technology.Excitement in the community of chemical-vapor-deposition (CVD) diamond researchers, funding agencies, and industrial companies ran high in expectation of early realization for many of the commercial goals that had been envisioned: tool, optical, and corrosion-resistant coatings; flat-panel displays; thermomanagement for electronic components, etc. Market projection predicting diamond-film sales in the billions of dollars by the year 2000 was commonplace. Hopes were dashed when these optimistic predictions ran up against the enormous scientific and technical problems that had to be overcome in order for those involved to fully exploit the potential of diamond. This experience is not new to the scientific community. One need only remind oneself of the hopes for cheap nuclear power or for high-temperature superconducting wires available at hardware stores to realize that the lag between scientific discoveries and their large-scale applications can be very long. Diamond films are in fact being used today in commercial applications.

scholarly journals Large-Scale Synthesis of High-Quality Hexagonal Boron Nitride Nanosheets for Large-Area Graphene Electronics

Nano Letters ◽  
2012 ◽  
Vol 12 (2) ◽  
pp. 714-718 ◽  
Author(s):  
Kang Hyuck Lee ◽  
Hyeon-Jin Shin ◽  
Jinyeong Lee ◽  
In-yeal Lee ◽  
Gil-Ho Kim ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Large Scale ◽  
Hexagonal Boron Nitride ◽  
Large Area ◽  
High Quality ◽  
Boron Nitride Nanosheets ◽  
Large Scale Synthesis

scholarly journals Conversion of WO3 thin films into self-crosslinked nanorods for large-scale ultraviolet detection

RSC Advances ◽  
2020 ◽  
Vol 10 (24) ◽  
pp. 14147-14153 ◽  
Author(s):  
Youngho Kim ◽  
Sang Hoon Lee ◽  
Seyoung Jeong ◽  
Bum Jun Kim ◽  
Jae-Young Choi ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Large Scale ◽  
High Density ◽  
Large Area ◽  
High Quality ◽  
Ultraviolet Detection ◽  
Heat Treated ◽  
Wo3 Thin Films

We heat-treated an amorphous large-area WO3 thin film to synthesize high-density, high-quality WO3 nanorods.

Technological Development for Commercialization of Amorphous Silicon Based Multijunction Modules

1996 ◽  
Vol 420 ◽  
Author(s):  
Liyou Yang ◽  
M. Bennett ◽  
L. Chen ◽  
K. Jansen ◽  
J. Kessler ◽  
...  
Keyword(s):  
Amorphous Silicon ◽  
Conversion Efficiency ◽  
Large Scale ◽  
Technological Development ◽  
Large Area ◽  
High Quality ◽  
Photovoltaic Modules ◽  
Silicon Based

AbstractSome of the significant steps in technological development for large-scale commercialization of amorphous silicon (a-Si:H) based multijunction photovoltaic modules are presented. These developments are establishing a high quality baseline process for manufacturing large-area ( ˜ 8 ft2) a-Si:H/a-SiGe:H tandem junction modules with improved stabilized conversion efficiency, throughput, yield, and reduced materials usage.

Technological Development for Commercialization of Amorphous Silicon Based Multijunction Modules

1996 ◽  
Vol 426 ◽  
Author(s):  
Liyou Yang ◽  
M. Bennett ◽  
L. Chen ◽  
K. Jansen ◽  
J. Kessler ◽  
...  
Keyword(s):  
Amorphous Silicon ◽  
Conversion Efficiency ◽  
Large Scale ◽  
Technological Development ◽  
Large Area ◽  
High Quality ◽  
Photovoltaic Modules ◽  
Silicon Based

AbstractSome of the significant steps in technological development for large-scale commercialization of amorphous silicon (a-Si:H) based multijunction photovoltaic modules are presented. These developments are establishing a high quality baseline process for manufacturing large-area ( ∼ 8 ft2) a-Si:H/a-SiGe:H tandem junction modules with improved stabilized conversion efficiency, throughput, yield, and reduced materials usage.

Versatile Water-Based Transfer of Large-Area Graphene Films onto Flexible Substrates

MRS Advances ◽  
2017 ◽  
Vol 2 (60) ◽  
pp. 3749-3754
Author(s):  
Maria Kim ◽  
Changfeng Li ◽  
Jannatul Susoma ◽  
Juha Riikonen ◽  
Harri Lipsanen
Keyword(s):  
Transfer Process ◽  
Flexible Electronics ◽  
Large Scale ◽  
Hot Water ◽  
Polyethylene Naphthalate ◽  
Large Area ◽  
High Quality ◽  
Flexible Polymer ◽  
Graphene Films ◽  
Water Based

ABSTRACTNext-generation electronic devices are expected to demonstrate greater utility, efficiency and durability. Meanwhile, plastics such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN) and variety of poly(para-xylylene) polymers enable transformational advantages to device shape, flexibility, weight, transparency and recyclability. Exhibiting a combination of outstanding mechanical, electrical, optical, and chemical properties of graphene with the plastic substrates could propose ideal material for the future flexible electronics. Chemical vapor deposition (CVD) allows cost-effective fabrication of a high-quality large-area graphene films, however, the critical issue is clean and noninvasive transfer of the films onto a desired substrate. The water-based delamination of CVD grown graphene on Cu can be considered as a “green” transfer process utilizing only hot deionized water. We investigated a method requiring only two essential steps: coating of 6-inch monolayer CVD graphene with transparent and flexible polymer, and Cu delamination in hot water. Proposed method is inexpensive, reproducible, environmentally friendly, waste-free and suitable for large-scale, high quality graphene. The transfer process demonstrated films with enhanced charge carrier mobility, high uniformity, free of mechanical defects, and sheet resistance as low as ∼50 Ω/sq with 96.5 % transparency at 550 nm wavelength.

scholarly journals New generation wide-fast-deep optical surveys: petabytes from the sky

2006 ◽  
Vol 2 (14) ◽  
pp. 590-590
Author(s):  
J. Anthony Tyson
Keyword(s):  
Linear Function ◽  
Large Scale ◽  
Planetary Science ◽  
Wide Field ◽  
Large Area ◽  
High Quality ◽  
Data Set ◽  
Optical Astronomy ◽  
New Generation ◽  
Optical Surveys

Many fundamental problems in optical astronomy – from planetary science, galactic structure, optical transients, to large-scale structure and cosmology – could be addressed though the same data set with millions of exposures in superb seeing, in multiple passbands, to very faint magnitudes over a large area of sky. This capability is largely driven by technology. In a logical progression towards this scientific capability, several increasingly ambitious wide-field optical surveys are planned in the next few years. A uniform high quality database covering all these science areas would be an ideal match to the VO. The above utopian goal of simultaneous pursuit of parallel surveys is achievable, but it relies on the ability to image a wide field quickly and deeply, and it is a non-linear function of the camera+telescope étendue.

High quality diffractive optical elements (DOEs) using SMILE imprint technique

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Simon Drieschner ◽  
Fabian Kloiber ◽  
Marc Hennemeyer ◽  
Jan J. Klein ◽  
Manuel W. Thesen
Keyword(s):  
Soft Lithography ◽  
High Efficiency ◽  
Low Cost ◽  
Industrial Applications ◽  
Diffractive Optical Elements ◽  
Large Area ◽  
High Quality ◽  
Optical Elements ◽  
Uv Curable ◽  
Aspect Ratios

Abstract Augmented reality (AR) enhancing the existing natural environment by overlaying a virtual world is an emerging and growing market and attracts huge commercial interest into optical devices which can be implemented into head-mounted AR equipment. Diffractive optical elements (DOEs) are considered as the most promising candidate to meet the market’s requirements such as compactness, low-cost, and reliability. Hence, they allow building alternatives to large display headsets for virtual reality (VR) by lightweight glasses. Soft lithography replication offers a pathway to the fabrication of large area DOEs with high aspect ratios, multilevel features, and critical dimensions below the diffractive optical limit down to 50 nm also in the scope of mass manufacturing. In combination with tailored UV-curable photopolymers, the fabrication time can be drastically reduced making it very appealing to industrial applications. Here, we illustrate the key features of high efficiency DOEs and how the SMILE (SUSS MicroTec Imprint Lithography Equipment) technique can be used with advanced imprint photopolymers to obtain high quality binary DOEs meeting the market’s requirements providing a very versatile tool to imprint both nano- and microstructures.

scholarly journals Constructing molecular structures on periodic superstructure of graphene/Ru(0001)

2014 ◽  
Vol 372 (2013) ◽  
pp. 20130015 ◽  
Author(s):  
Geng Li ◽  
Li Huang ◽  
Wenyan Xu ◽  
Yande Que ◽  
Yi Zhang ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Surface Charge ◽  
Large Scale ◽  
Lattice Mismatch ◽  
Molecular Structures ◽  
Iron Phthalocyanine ◽  
Charge Redistribution ◽  
High Quality ◽  
Practical Applications ◽  
Substrate Interaction

We review the way to fabricate large-scale, high-quality and single crystalline graphene epitaxially grown on Ru(0001) substrate. A moiré pattern of the graphene/Ru(0001) is formed due to the lattice mismatch between graphene and Ru(0001). This superstructure gives rise to surface charge redistribution and could behave as an ordered quantum dot array, which results in a perfect template to guide the assembly of organic molecular structures. Molecules, for example iron phthalocyanine and C 60 , on this template show how the molecule–substrate interaction makes different superstructures. These results show the possibility of constructing ordered molecular structures on graphene/Ru(0001), which is helpful for practical applications in the future.

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