Movable-Type Transfer and Stacking of van der Waals Heterostructures for Spintronics

Cao, Yuan; Wang, Xin-He; Lin, Xiaoyang; Yang, Wei; Lv, Chen; Lü, Yuan; Zhang, Youguang; Zhao, Weisheng

doi:10.1109/access.2020.2984942

Cited by 15 publications

(11 citation statements)

References 52 publications

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“…For instance, the roll-to-roll (R2R) method, described in section 2.1.4, is scalable and suitable for flexible targets such as PET or EVA, but it is not applicable to inflexible SiO 2 /Si substrates and therefore of little use in the semiconductor industry [170]. By comparison, water-soluble supports such as PVA or PVP can be used to transfer TMD layers to various substrates, including Cu foil, SiO 2 /Si and quartz [62].…”

Section: Discussionmentioning

confidence: 99%

“…Uncrosslinked oligomers can remain [61]. PVA Water soluble [62]. Low viscoelastic properties, usually requiring secondary supporting layer [63].…”

Section: Support Layer Advantages Disadvantagesmentioning

confidence: 99%

“…Low viscoelastic properties, usually requiring secondary supporting layer [63]. Good adhesive contact [62]. PS More robust support than PMMA, preventing wrinkling and allowing contiguous transfer [39,64].…”

Section: Support Layer Advantages Disadvantagesmentioning

confidence: 99%

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Transfer of large-scale two-dimensional semiconductors: challenges and developments

Watson¹,

Lu²,

Guimarães³

et al. 2021

2D Mater.

126

103

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Two-dimensional (2D) materials offer opportunities to explore both fundamental science and applications in the limit of atomic thickness. Beyond the prototypical case of graphene, other 2D materials have recently come to the fore. Of particular technological interest are 2D semiconductors, of which the family of materials known as the group-VI transition metal dichalcogenides (TMDs) has attracted much attention. The presence of a bandgap allows for the fabrication of high on-off ratio transistors and optoelectronic devices, as well as valley/spin polarized transport. The technique of chemical vapor deposition (CVD) has produced high-quality and contiguous wafer-scale 2D films, however, they often need to be transferred to arbitrary substrates for further investigation. In this review, the various transfer techniques developed for transferring 2D films will be outlined and compared, with particular emphasis given to CVD-grown TMDs. Each technique suffers undesirable process-related drawbacks such as bubbles, residue or wrinkles, which can degrade device performance by for instance reducing electron mobility. This review aims to address these problems and provide a systematic overview of key methods to characterize and improve the quality of the transferred films and heterostructures. With the maturing technological status of CVD-grown 2D materials, a robust transfer toolbox is vital.

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Section: Discussionmentioning

confidence: 99%

“…Uncrosslinked oligomers can remain [61]. PVA Water soluble [62]. Low viscoelastic properties, usually requiring secondary supporting layer [63].…”

Section: Support Layer Advantages Disadvantagesmentioning

confidence: 99%

See 1 more Smart Citation

Transfer of large-scale two-dimensional semiconductors: challenges and developments

Watson¹,

Lu²,

Guimarães³

et al. 2021

2D Mater.

126

103

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show abstract

“…9). PC was chosen as the substrate because its smooth surface and high surface energy (~40 mJ m −2 ) can provide a strong adhesion with the supported MoS 2 lm 26, 27 . The topview SEM image shows that the MoS 2 lm is continuous and devoid of cracks (Fig.…”

Section: Mos 2 Membranes For Water/ion Separationmentioning

confidence: 99%

Engineering grain boundaries in monolayer molybdenum disulfide for an efficient water/ion separation

Han

Shen

Aljarb

et al. 2023

Preprint

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Atomically thin two-dimensional (2D) materials have long been considered as ideal platforms for developing separation membranes. However, it is difficult to generate uniform subnanometer pores over large areas on 2D materials. Herein, we report that the well-defined defect structure of monolayer MoS2, namely, eight-membered ring (8-MR) pores typically formed at the boundaries of two antiparallel grains, can serve as molecular sieves for efficient water/ion separation. The 8-MR pores (4.2 × 2.4 Å) in monolayer MoS2 allow rapid single-file water transport while rejecting various hydrated ions. Further, the density of grain boundaries and, consequently, the density of pores can be tuned by regulating the nucleation density and size of MoS2 grains during the chemical vapor deposition process. The optimized MoS2 membrane exhibited an ultrahigh water/NaCl selectivity of ~6.5 × 104 at a water permeance of 232 mol m−2 h−1 bar−1, outperforming the state-of-the-art desalination membranes. When used for direct hydrogen production from seawater by combining the forward osmosis and electrochemical water splitting processes, the membrane achieved ~40 times the energy conversion efficiency of commercial polymeric membranes. It also exhibited a rapid and selective proton transport behavior desirable for fuel cells and electrolysis. The bottom-up approach of creating precise pore structures on atomically thin films via grain boundary engineering presents a promising route for producing large-area membranes suitable for various applications.

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“…Since interface cleanliness is crucial to its mechanical performance, we fabricated TMDC heterostructures using the pick-up method with a PVA (poly(vinyl alcohol)) film, as indicated in Figure a. The fabrication process ensures a polymer-free interface between the two layers of the heterostructure.…”

mentioning

confidence: 99%

Moiré-Assisted Strain Transfer in Vertical van der Waals Heterostructures

Hu,

Yu,

Chen

et al. 2023

Nano Lett.

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Strain provides a powerful method to study 2D monolayers and to tune their properties. The same approach also has great potential for van-der-Waals (vdW) heterostructures. However, we need to understand how strain can be applied to vertically stacked vdW structures, for which strain transfer from one layer to the next remains little explored. In our experiment, we fabricated vertical heterostructures consisting of transition metal dichalcogenides (TMDCs) monolayers that were deposited on a flexible substrate. These TMDC heterostructures allowed us to read out separately the strain in each monolayer by photoluminescence measurements. We find that, in TMDC heterostructures with large twist angles (>5°), strain transfer is limited. However, for aligned heterostructures with small twist angles (≤5°), near unity strain transfer efficiency is observed. We correlate this finding with the moiré domains formed in the aligned heterostructures by reconstruction.

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Movable-Type Transfer and Stacking of van der Waals Heterostructures for Spintronics

Cited by 15 publications

References 52 publications

Transfer of large-scale two-dimensional semiconductors: challenges and developments

Transfer of large-scale two-dimensional semiconductors: challenges and developments

Engineering grain boundaries in monolayer molybdenum disulfide for an efficient water/ion separation

Moiré-Assisted Strain Transfer in Vertical van der Waals Heterostructures

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