Superlattices based on van der Waals 2D materials

Ryu, Yu Kyoung; Frisenda, Riccardo; Castellanos-Gómez, Andrés

doi:10.1039/c9cc04919c

Cited by 60 publications

(42 citation statements)

References 132 publications

(302 reference statements)

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“…Combining different 2D materials into vdWH to prepare p–n junctions, photodetectors, and other devices will likely achieve unexpected performance, and the preparation of superlattices has become an unique platform to explore and observe novel quantum phenomena. [ 24–27 ] To date, the most extensive method of stacking 2D layers to prepare the vdWH relies on a deterministic placement way, which is cumbersome and susceptible to improper lattice orientation control and the presence of undesirable interlayer adsorbates. [ 28,29 ] In 2017, Gomez et al [ 30 ] and Dryfe et al [ 31 ] both presented the method to fabricate ultrathin heterostructures by exfoliating natural franckeite.…”

Section: Figurementioning

confidence: 99%

Nonlinear Optical Response in Natural van der Waals Heterostructures

Yang

et al. 2020

Advanced Optical Materials

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Van der Waals heterostructures (vdWH) composed from individual 2D crystals offer a platform to obtain unprecedented functionalities that are not accessible in other heterostructures. The research to date has been largely limited to exfoliated and restacked flakes, and the controlled growth of such heterostructures remains a significant challenge. Here, an experimental study of the broadband nonlinear optical performance of a naturally occurring vdWH franckeite is presented, which is composed of alternating SnS2‐like and PbS‐like layers stacked on top of each other. Few‐layer franckeite is prepared via liquid‐phase exfoliation method and its broadband ultrafast third‐order nonlinear optical behavior is characterized experimentally. It is found that the layered franckeite exhibits broadband nonlinear optical response and the ultrafast carrier dynamics with the intraband carrier recovery time of ≈16 ps and the interband carrier recovery time of ≈300 ps. With the large optical nonlinearity of layered franckeite, the all‐optical modulator and switcher have been demonstrated based on the spatial phase modulation effect. The experimental results provide a fundamental understanding of the ultrafast nonlinear optical response in a complex naturally occurring vdWH, and may pave an avenue toward developing novel broadband optoelectronic devices.

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Section: Figurementioning

confidence: 99%

Nonlinear Optical Response in Natural van der Waals Heterostructures

Yang

et al. 2020

Advanced Optical Materials

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“…Some members of the sulfosalt family are composed of alternating layers with dissimilar chemical composition (i.e., they constitute naturally occurring van der Waals superlattices 97 ). Some illustrative examples of this sub-family are the franckeite, the cylindrite and the cannizzarite.…”

Section: Sulfosaltsmentioning

confidence: 99%

Naturally occurring van der Waals materials

et al. 2020

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The exfoliation of two naturally occurring van der Waals minerals, graphite and molybdenite, arouse an unprecedented level of interest by the scientific community and shaped a whole new field of research: 2D materials research. Several years later, the family of van der Waals materials that can be exfoliated to isolate 2D materials keeps growing, but most of them are synthetic. Interestingly, in nature, plenty of naturally occurring van der Waals minerals can be found with a wide range of chemical compositions and crystal structures whose properties are mostly unexplored so far. This Perspective aims to provide an overview of different families of van der Waals minerals to stimulate their exploration in the 2D limit.

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“…Chemical vapor deposition (CVD) has been widely used for highly scalable films of crystals . Another technique to grow high‐quality 2D materials is molecular beam epitaxy (MBE) . MBE realizes accurate control of the thickness, and enables the epitaxial growth of 2D materials on certain substrates but with inefficient production speed.…”

Section: Library Of 2d Materials and Their Heterostructuresmentioning

confidence: 99%

Recent Progress in Synaptic Devices Based on 2D Materials

Sun

Wang

Yang

2020

Advanced Intelligent Systems

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Diverse synaptic plasticity with a wide range of timescales in biological synapses plays an important role in memory, learning, and various signal processing with exceptionally low power consumption. Emulating biological synaptic functions by electric devices for neuromorphic computation has been considered as a way to overcome the traditional von Neumann architecture in which separated memory and information processing units require high power consumption for their functions. Synaptic devices are expected to conduct complex signal processing such as image classification, decision‐making, and pattern recognition in artificial neural networks. Among various materials and device architectures for synaptic devices, 2D materials and their van der Waals (vdW) heterostructures have been attracting tremendous attention from researchers based on their capacity to mimic unique synaptic plasticity for neuromorphic computing. Herein, the basic operations of biological synapses and physical properties of 2D materials are discussed, and then 2D materials and their vdW heterostructures for advanced synaptic operations with novel working mechanisms are reviewed. In particular, there is a focus on how to design synaptic devices with the vdW structures in terms of critical 2D materials and their limitations, providing insight into the emerging synaptic device systems and artificial neural networks with 2D materials.

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Superlattices based on van der Waals 2D materials

Abstract: We explain in detail the state-of-the-art of 2D material-based superlattices and describe the different methods to fabricate them.

Cited by 60 publications

References 132 publications

Nonlinear Optical Response in Natural van der Waals Heterostructures

Nonlinear Optical Response in Natural van der Waals Heterostructures

Naturally occurring van der Waals materials

Recent Progress in Synaptic Devices Based on 2D Materials

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