CVD Technology for 2-D Materials

Shen, Pin-Chun; Lin, Yuxuan; Wang, Haozhe; Park, Jihoon; Leong, Wei Sun; Lu, Ang‐Yu; Palacios, Tomás; Kong, Jing

doi:10.1109/ted.2018.2866390

Cited by 54 publications

(40 citation statements)

References 168 publications

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“…In the end, the proposed model overcomes restrictions of both individual methods evaluating just one parameter for layer stacks which do not exhibit a measurable contrast or wavelength shift. In addition, the proposed method is suitable for in situ and ex situ process control of 2D materials and heterostructures deposited via exfoliation, CVD 39 or laser direct writing 40 due to the achievable resolution using objective lenses with high magnification enabling the characterization of micrometer-sized structures. Another conceivable application is the detection of adsorbates on 2D materials by tracking the changes in reflectance.…”

Section: Resultsmentioning

confidence: 99%

Highly accurate determination of heterogeneously stacked Van-der-Waals materials by optical microspectroscopy

Hutzler

Fritsch

Matthus

et al. 2020

Sci Rep

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the composition of Van-der-Waals heterostructures is conclusively determined using a hybrid evaluation scheme of data acquired by optical microspectroscopy. this scheme deploys a parameter set comprising both change in reflectance and wavelength shift of distinct extreme values in reflectance spectra. Furthermore, the method is supported by an accurate analytical model describing reflectance of multilayer systems acquired by optical microspectroscopy. This approach allows uniquely for discrimination of 2D materials like graphene and hexagonal boron nitride (hBN) and, thus, quantitative analysis of Van-der-Waals heterostructures containing structurally very similar materials. The physical model features a transfer-matrix method which allows for flexible, modular description of complex optical systems and may easily be extended to individual setups. It accounts for numerical apertures of applied objective lenses and a glass fiber which guides the light into the spectrometer by two individual weighting functions. The scheme is proven by highly accurate quantification of the number of layers of graphene and hBN in Van-der-Waals heterostructures. In this exemplary case, the fingerprint of graphene involves distinct deviations of reflectance accompanied by additional wavelength shifts of extreme values. In contrast to graphene, the fingerprint of hBN reveals a negligible deviation in absolute reflectance causing this material being only detectable by spectral shifts of extreme values.

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Section: Resultsmentioning

confidence: 99%

Highly accurate determination of heterogeneously stacked Van-der-Waals materials by optical microspectroscopy

Hutzler

Fritsch

Matthus

et al. 2020

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Moreover, the contribution of the precursor to the resulting product is also significant but is generally considered to be secondary. [87,90,103,104] The advantage is that these parameters can be controlled externally, which can lead to controllable growth. Thus, herein, we intend to highlight the effects of various CVD parameters on the synthesis of single-element-and multielement-doped 3D graphene.…”

Section: Cvd Synthesismentioning

confidence: 99%

Synthesis of Doped Porous 3D Graphene Structures by Chemical Vapor Deposition and Its Applications

Ullah

Hasan

et al. 2019

Adv Funct Materials

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Graphene doping principally commenced to compensate for its inert nature and create an appropriate bandgap. Doping of 3D graphene has emerged as a topic of interest because of attempts to combine its large available surface area-arising from its interconnected porous architecture-with superior catalytic, structural, chemical, and biocompatible characteristics that can be induced by doping. In light of the latest developments, this review provides an overview of the scalable chemical vapor deposition (CVD)-based growth of doped 3D graphene materials as well as their applications in various contexts, such as in devices used for energy generation and gas storage and biosensors. In particular, single-and multielement doping of 3D graphene by various dopants (such as nitrogen (N), boron (B), sulfur (S) and phosphorous (P)), the doping configurations of the resultant materials, an overview of recent developments in the field of CVD, and the influence of various parameters of CVD on graphene doping and 3D morphologies are focused in this paper. Finally, this report concludes the discussion by mentioning the existing challenges and future opportunities of these developing graphitic materials, intending to inspire the unveiling of more exciting functionalized 3D graphene morphologies and their potential properties, which can hopefully realize many possible applications.

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“…The main idea of this field is to obtain new functionality by joining atomically thin flakes or films of layered materials. For the device technology CVD [ 7 , 8 ], epitaxy [ 9 ], physical vapour transport (PVT) [ 10 ] and electrophoresis [ 11 , 12 , 13 , 14 ] methods of deposition and assembly are preferable. Most of laboratory research on van der Waals heterostructures however rely on deterministical mechanical placement of the flakes.…”

Section: Introductionmentioning

confidence: 99%

Making van der Waals Heterostructures Assembly Accessible to Everyone

et al. 2020

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Van-der Waals heterostructures assembled from one or few atomic layer thickness crystals are becoming increasingly more popular in condensed matter physics. These structures are assembled using transfer machines, those are based on mask aligners, probe stations or are home-made. For many laboratories it is vital to build a simple, convenient and universal transfer machine. In this paper we discuss the guiding principles for the design of such a machine, review the existing machines and demonstrate our own construction, that is powerful and fast-in-operation. All components of this machine are extremely cheap and can be easily purchased using common online retail services. Moreover, assembling a heterostructure out of exfoliated commercially available hexagonal boron nitride and tungsten diselenide crystals with a pick-up technique and using the microphotolumenescence spectra, we show well-resolved exciton and trion lines, as a results of disorder suppression in WSe2 monolayer. Our results thus show that technology of the two-dimensional materials and heterostructures becomes accessible to anyone.

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CVD Technology for 2-D Materials

Cited by 54 publications

References 168 publications

Highly accurate determination of heterogeneously stacked Van-der-Waals materials by optical microspectroscopy

Highly accurate determination of heterogeneously stacked Van-der-Waals materials by optical microspectroscopy

Synthesis of Doped Porous 3D Graphene Structures by Chemical Vapor Deposition and Its Applications

Making van der Waals Heterostructures Assembly Accessible to Everyone

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