Production Methods of Van der Waals Heterostructures Based on Transition Metal Dichalcogenides

Qi, Haimei; Wang, Lina; Sun, Jie; Long, Yi; Hu, Peng; Liu, Fucai; He, Xuexia

doi:10.3390/cryst8010035

Cited by 53 publications

(36 citation statements)

References 103 publications

(116 reference statements)

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“…Two-dimensional materials and van der Waals heterostructures area is developing explosively, driving scientific breakthroughs [ 1 , 2 ], technology development [ 3 , 4 ] and device applications [ 5 , 6 ]. The main idea of this field is to obtain new functionality by joining atomically thin flakes or films of layered materials.…”

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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Section: Introductionmentioning

confidence: 99%

Making van der Waals Heterostructures Assembly Accessible to Everyone

et al. 2020

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“…Building nano-devices, based on vertical or lateral heterojunctions made of two-dimensional materials (2DM), is gaining increasing interest for electronics and photonics applications [ 1 , 2 , 3 ]. The production of these van der Waals heterostructures requires either transferring or the direct growth of individual 2DM layers, one on another or one besides the other [ 4 , 5 ]. The procedures developed to obtain ever more complex stacks need to be carefully planned, controlled, and verified step by step.…”

Section: Introductionmentioning

confidence: 99%

Scanning Probe Spectroscopy of WS2/Graphene Van Der Waals Heterostructures

et al. 2020

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In this paper, we present a study of tungsten disulfide (WS2) two-dimensional (2D) crystals, grown on epitaxial Graphene. In particular, we have employed scanning electron microscopy (SEM) and µRaman spectroscopy combined with multifunctional scanning probe microscopy (SPM), operating in peak force–quantitative nano mechanical (PF-QNM), ultrasonic force microscopy (UFM) and electrostatic force microscopy (EFM) modes. This comparative approach provides a wealth of useful complementary information and allows one to cross-analyze on the nanoscale the morphological, mechanical, and electrostatic properties of the 2D heterostructures analyzed. Herein, we show that PF-QNM can accurately map surface properties, such as morphology and adhesion, and that UFM is exceptionally sensitive to a broader range of elastic properties, helping to uncover subsurface features located at the buried interfaces. All these data can be correlated with the local electrostatic properties obtained via EFM mapping of the surface potential, through the cantilever response at the first harmonic, and the dielectric permittivity, through the cantilever response at the second harmonic. In conclusion, we show that combining multi-parametric SPM with SEM and µRaman spectroscopy helps to identify single features of the WS2/Graphene/SiC heterostructures analyzed, demonstrating that this is a powerful tool-set for the investigation of 2D materials stacks, a building block for new advanced nano-devices.

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“…Containing no internal interfaces for the electrons to scatter off, they possess an obvious advantage over traditional metamaterials. In experiments, single or few-layer nanosheets of these TMDs can be obtained by using Scotch-tape based micromechanical cleavage [29], CVD method, etc. [2].…”

Section: Introductionmentioning

confidence: 99%

Electronic and hyperbolic dielectric properties of ZrS2/HfS2 heterostructures

Zhang

Wang

et al. 2019

Phys. Rev. B

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In this paper we investigate the electronic and optical dielectric properties of lateral and vertical heterostructures composed of two-dimensional (2D) ZrS2 and HfS2 monolayers based on density functional theory. First, we show that the bulk and monolayer ZrS2 and HfS2 as well as the vertical (ZrS2)m/(HfS2)n heteroestructures are indirect band gap semiconductors, while the lateral heterostructures exhibit an indirect to direct bandgap transition. Then we demonstrate that the optical properties of the bulk and monolayer HfS2 and ZrS2 are strongly anisotropic, for the bulk HfS2 and ZrS2, the in-plane components of the dielectric function is negative in a certain frequency band, where they can work as naturally hyperbolic metamaterials (HMMs). Interestingly, the vertical heterostructures also possess a hyperbolic region, whose position and width can be tunable with the thickness ratio of constituents. It is also found that the (ZrS2)/(HfS2) vertical heterostructures can enhance spontaneous emission and about 100-fold improvement of the Purcell factor is obtained. These results prove the feasibility of 2D material heterostructures to realize tunable hyperbolic metamaterials, the heterostructures present a promising opportunity for the practical applications in light-generation technologies.

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Production Methods of Van der Waals Heterostructures Based on Transition Metal Dichalcogenides

Cited by 53 publications

References 103 publications

Making van der Waals Heterostructures Assembly Accessible to Everyone

Making van der Waals Heterostructures Assembly Accessible to Everyone

Scanning Probe Spectroscopy of WS2/Graphene Van Der Waals Heterostructures

Electronic and hyperbolic dielectric properties of ZrS2/HfS2 heterostructures

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