Van der Waals contacts between three-dimensional metals and two-dimensional semiconductors

Wang, Yan; Kim, Jong Chan; Wu, Ryan; Martinez, Jenny P.; Song, Xiuju; Yang, Jieun; Zhao, Fang; Mkhoyan, K. Andre; Jeong, Hu Young; Chhowalla, Manish

doi:10.1038/s41586-019-1052-3

Cited by 627 publications

(621 citation statements)

References 45 publications

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“…In these flexible devices, the FTCEs should form a close, intimate mechanical contact and adhesion with various active components of the flexible devices to ensure stable, low‐resistant electrical contacts. [ 9 ] Flexible optoelectronic devices rely on the stable and intimate electrical and mechanical contacts between electrodes and active device components. [ 10 ] Unstable contact formations at the interfaces of the electrodes and active device components can cause malfunctions and performance degradation of electronics and efficiency reduction of energy devices, adversely affecting device reliability.…”

Section: Introductionmentioning

confidence: 99%

Low‐Resistant Electrical and Robust Mechanical Contacts of Self‐Attachable Flexible Transparent Electrodes with Patternable Circuits

Hwang

Seong

et al. 2020

Adv Funct Materials

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Flexible, transparent, conductive electrodes are key elements of emerging flexible electronic and energy devices. Such electrodes should form an intimate physical contact with various active components of flexible devices to ensure stable, low-resistant electrical contacts. However, contact formation techniques are based largely on conventional soldering, conductive pastes, mechanical clamping, and thin film deposition. These generally result in damaged, contaminated, bulky, and uncontrollable contact interfaces. A self-attachable, flexible, transparent, and conductive electrode that is based on a distinctive design of regular grid patterns into which bioinspired adhesive architectures and percolating Ag nanowires are integrated is proposed. Based on this integrated design, the proposed electrode forms reliable, low-resistant electrical contacts; strong mechanical adhesive contacts; and ultra-clean, damage-free contact interfaces with active device components by attaching onto the components without using additional conductive pastes, mechanical pressing, or vacuum deposition processes. The contact interfaces of the electrode and device components remain stable even when the electrode is extremely bent. Moreover, specific electronic circuits can be generated on the electrode surface by a selective deposition of Ag nanowires. This enables simple interconnections of diverse electronic components on its surface.

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Section: Introductionmentioning

confidence: 99%

Low‐Resistant Electrical and Robust Mechanical Contacts of Self‐Attachable Flexible Transparent Electrodes with Patternable Circuits

Hwang

Seong

et al. 2020

Adv Funct Materials

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“…Interface engineering, such as insertion of additional vdW layers (graphene 15 , hexagonal boron nitride (hBN) 16 , etc. ), mechanical transfer of metal films 13 and incorporation with indium 17 , are explored to form ideal vdW contacts that are free from the chemical disorder.…”

mentioning

confidence: 99%

Van der Waals interfacial reconstruction in monolayer transition-metal dichalcogenides and gold heterojunctions

Luo

Zhang

et al. 2020

Nat Commun

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The structures and properties of van der Waals (vdW) heterojunctions between semiconducting two-dimensional transition-metal dichalcogenides (2D TMDs) and conductive metals, such as gold, significantly influence the performances of 2D-TMD based electronic devices. Chemical vapor deposition is one of the most promising approaches for large-scale synthesis and fabrication of 2D TMD electronics with naturally formed TMD/metal vdW interfaces. However, the structure and chemistry of the vdW interfaces are less known. Here we report the interfacial reconstruction between TMD monolayers and gold substrates. The participation of sulfur leads to the reconstruction of Au {001} surface with the formation of a metastable Au 4 S 4 interfacial phase which is stabilized by the top MoS 2 and WS 2 monolayers. Moreover, the enhanced vdW interaction between the reconstructed Au 4 S 4 interfacial phase and TMD monolayers results in the transition from n-type TMD-Au Schottky contact to ptype one with reduced energy barrier height.

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“…Thus, the electron carrier ac- cumulates at the In-MoS 2 interface, and no barrier exists for the electron carrier. Secondly, In and MoS 2 can form van der Waals interaction to demonstrate a low contact resistance and provide good contact, as reported in a recent study [34]. Here, 5 nm In followed by 50 nm Au were deposited as the source and drain electrodes, which can maintain the higher mobility for biosensor and also increase the adhesion force compared with gold electrodes.…”

Section: Device Measurement and Characterizationmentioning

confidence: 81%

Membraneless reproducible MoS2 field-effect transistor biosensor for high sensitive and selective detection of FGF21

et al. 2019

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Fibroblast growth factor 21 (FGF21) serves as an essential biomarker for early detection and diagnosis of nonalcoholic fatty liver disease (NAFLD). It has received a great deal of attention recently in efforts to develop an accurate and effective method for detecting low levels of FGF21 in complex biological settings. Herein, we demonstrate a label-free, simple and high-sensitive field-effect transistor (FET) biosensor for FGF21 detection in a nonaqueous environment, directly utilizing two-dimensional molybdenum disulfide (MoS 2 ) without additional absorption layers. By immobilizing anti-FGF21 on MoS 2 surface, this biosensor can achieve the detection of trace FGF21 at less than 10 fg mL −1 . High consistency and satisfactory reproducibility were demonstrated through multiple sets of parallel experiments for the MoS 2 FETs. Furthermore, the biosensor has great sensitivity to detect the target FGF21 in complex serum samples, which demonstrates its great potential application in disease diagnosis of NAFLD. Overall, this study shows that thin-layered transition-metal dichalcogenides (TMDs) can be used as a potential alternative platform for developing novel electrical biosensors with high sensitivity and selectivity.

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Van der Waals contacts between three-dimensional metals and two-dimensional semiconductors

Cited by 627 publications

References 45 publications

Low‐Resistant Electrical and Robust Mechanical Contacts of Self‐Attachable Flexible Transparent Electrodes with Patternable Circuits

Low‐Resistant Electrical and Robust Mechanical Contacts of Self‐Attachable Flexible Transparent Electrodes with Patternable Circuits

Van der Waals interfacial reconstruction in monolayer transition-metal dichalcogenides and gold heterojunctions

Membraneless reproducible MoS2 field-effect transistor biosensor for high sensitive and selective detection of FGF21

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