New Strategy for the Growth of Complex Heterostructures Based on Different 2D Materials

Cattelan, Mattia; Markman, Brian; Lucchini, Giacomo; Das, Pranab K.; Vobornik, I.; Robinson, Joshua A.; Agnoli, Stefano; Granozzi, Gaetano

doi:10.1021/acs.chemmater.5b01170

Cited by 33 publications

(26 citation statements)

References 64 publications

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“…Analysing WS 2 grown using H 2 WO 4 + NaCl, the W 4f 5/2 and W 4f 7/2 core levels (Fig. 5a ) present peak position characteristic of W 4+ in WS 2 43 , 44 (32.7 and 34.8 eV respectively) and the narrowest achievable FWHM (1 eV) (Fig. 5a ), using the Mg Kα as X-ray source.…”

Section: Resultsmentioning

confidence: 99%

High-Mobility and High-Optical Quality Atomically Thin WS 2

Reale

Palczynski

Amit

et al. 2017

Sci Rep

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The rise of atomically thin materials has the potential to enable a paradigm shift in modern technologies by introducing multi-functional materials in the semiconductor industry. To date the growth of high quality atomically thin semiconductors (e.g. WS2) is one of the most pressing challenges to unleash the potential of these materials and the growth of mono- or bi-layers with high crystal quality is yet to see its full realization. Here, we show that the novel use of molecular precursors in the controlled synthesis of mono- and bi-layer WS2 leads to superior material quality compared to the widely used direct sulfidization of WO3-based precursors. Record high room temperature charge carrier mobility up to 52 cm2/Vs and ultra-sharp photoluminescence linewidth of just 36 meV over submillimeter areas demonstrate that the quality of this material supersedes also that of naturally occurring materials. By exploiting surface diffusion kinetics of W and S species adsorbed onto a substrate, a deterministic layer thickness control has also been achieved promoting the design of scalable synthesis routes.

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Section: Resultsmentioning

confidence: 99%

High-Mobility and High-Optical Quality Atomically Thin WS 2

Reale

Palczynski

Amit

et al. 2017

Sci Rep

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“…It is an insulator with a band gap of more than 5 eV [ 63 ] and therefore represents a fundamental component of future 2D electronic devices. Hexagonal boron nitride single layers have been grown on epitaxial substrates and intercalated to obtain a quasi-free-standing layer and this change has been visualized by conventional ARPES [ 64 , 65 ]. It has also been mechanically exfoliated and analyzed by nano-ARPES [ 66 ], exactly as has been done previously with graphene.…”

Section: Spatially Resolved Arpes For 2d Materialsmentioning

confidence: 99%

A Perspective on the Application of Spatially Resolved ARPES for 2D Materials

Cattelan

Fox

2018

Nanomaterials

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In this paper, a perspective on the application of Spatially- and Angle-Resolved PhotoEmission Spectroscopy (ARPES) for the study of two-dimensional (2D) materials is presented. ARPES allows the direct measurement of the electronic band structure of materials generating extremely useful insights into their electronic properties. The possibility to apply this technique to 2D materials is of paramount importance because these ultrathin layers are considered fundamental for future electronic, photonic and spintronic devices. In this review an overview of the technical aspects of spatially localized ARPES is given along with a description of the most advanced setups for laboratory and synchrotron-based equipment. This technique is sensitive to the lateral dimensions of the sample. Therefore, a discussion on the preparation methods of 2D material is presented. Some of the most interesting results obtained by ARPES are reported in three sections including: graphene, transition metal dichalcogenides (TMDCs) and 2D heterostructures. Graphene has played a key role in ARPES studies because it inspired the use of this technique with other 2D materials. TMDCs are presented for their peculiar transport, optical and spin properties. Finally, the section featuring heterostructures highlights a future direction for research into 2D material structures.

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“…In their recent publication, they triggered the extended range of various applications for such heterostructures apart from demonstrating the photovoltaic effect . The Van der Waals epitaxial fabrication process, direct growth, and the large‐scale CVD growth process are used to realize thin van der Waals heterostructures like graphene/h‐BN, MoS 2 /graphene, MoS 2 /h‐BN, WS 2 /h‐BN, WS 2 /MoS 2 , and MoS 2 /WSe 2 heterojunctions…”

Section: D/2d Heterojunction Solar Cellsmentioning

confidence: 99%

The Role of Graphene and Other 2D Materials in Solar Photovoltaics

et al. 2018

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2D materials have attracted considerable attention due to their exciting optical and electronic properties, and demonstrate immense potential for next-generation solar cells and other optoelectronic devices. With the scaling trends in photovoltaics moving toward thinner active materials, the atomically thin bodies and high flexibility of 2D materials make them the obvious choice for integration with future-generation photovoltaic technology. Not only can graphene, with its high transparency and conductivity, be used as the electrodes in solar cells, but also its ambipolar electrical transport enables it to serve as both the anode and the cathode. 2D materials beyond graphene, such as transition-metal dichalcogenides, are direct-bandgap semiconductors at the monolayer level, and they can be used as the active layer in ultrathin flexible solar cells. However, since no 2D material has been featured in the roadmap of standard photovoltaic technologies, a proper synergy is still lacking between the recently growing 2D community and the conventional solar community. A comprehensive review on the current state-of-the-art of 2D-materials-based solar photovoltaics is presented here so that the recent advances of 2D materials for solar cells can be employed for formulating the future roadmap of various photovoltaic technologies.

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New Strategy for the Growth of Complex Heterostructures Based on Different 2D Materials

Cited by 33 publications

References 64 publications

High-Mobility and High-Optical Quality Atomically Thin WS 2

High-Mobility and High-Optical Quality Atomically Thin WS 2

A Perspective on the Application of Spatially Resolved ARPES for 2D Materials

The Role of Graphene and Other 2D Materials in Solar Photovoltaics

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