High quality hydrogen silsesquioxane encapsulated graphene devices with edge contacts

Li, Penglei; Collomb, David; Bending, S. J.

doi:10.1016/j.matlet.2019.126765

Cited by 7 publications

(7 citation statements)

References 15 publications

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“…In the device fabricated with HSQ this shift is several times smaller than in the device fabricated with AR-N 7500 (∼ 40V of gate voltage compared to ∼ 120V) which indicates that the encapsulated graphene is less contaminated. Both results agree with the previous studies [10,19].…”

supporting

confidence: 94%

“…As graphene electronic devices approach practical applicability, encapsulation can be beneficial, reducing the probability of damaging the graphene in subsequent fabrication steps [10]. As 2D materials have a large surface to volume ratio, surface contamination in the active region of the device can result in large variations of conductance [11].…”

mentioning

confidence: 99%

“…Recent work has also shown quantum dot formation through effective doping of graphene with varying exposure dose [19]. It has been demonstrated that HSQ encapsulated devices have an increased conductance and yield compared to those fabricated with polymethyl methacrylate (PMMA) resist due to the graphene being protected during post-exposure processing and the decreased contamination and doping of graphene by resist residue [10].…”

mentioning

confidence: 99%

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Electric-field-driven conductance switching in encapsulated graphene nanogaps

Pyurbeeva,

Swett,

et al. 2021

Preprint

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Feedback-controlled electric breakdown of graphene in air or vacuum is a well-established way of fabricating tunnel junctions, nanogaps, and quantum dots. We show that the method is equally applicable to encapsulated graphene constrictions fabricated using hydrogen silsesquioxane. The silica-like layer left by hydrogen silsesquioxane resist after electron-beam exposure remains intact after electric breakdown of the graphene. We explore the conductance switching behavior that is common in graphene nanostructures fabricated via feedbackcontrolled breakdown, and show that it can be attributed to atomic-scale fluctuations of graphene below the encapsulating layer. Our findings open up new ways of fabricating encapsulated room-temperature single-electron nanodevices and shed light on the underlying physical mechanism of conductance switching in these graphene nanodevices.

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confidence: 94%

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confidence: 99%

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confidence: 99%

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Electric-field-driven conductance switching in encapsulated graphene nanogaps

Pyurbeeva,

Swett,

et al. 2021

Preprint

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“…The Hall effect is also widely used as a method of accurately determining the carrier mobility in metal or semiconductor materials. This is typically done in a Hall bar configuration, consisting of at least two conjoined Greek crosses, such as the graphene ones shown in figure 4 [6]. By measuring the Hall coefficient and the longitudinal resistances, and knowing the dimensions of the Hall bar, the mobility can accurately be estimated from the one band relationship for the electrical conductivity,…”

Section: The Classical Hall Effectmentioning

confidence: 99%

Frontiers of graphene-based Hall-effect sensors

Collomb

Li²,

Bending³

2021

J. Phys.: Condens. Matter

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Hall sensors have become one of the most used magnetic sensors in recent decades, performing the vital function of providing a magnetic sense that is naturally absent in humans. Various electronic applications have evolved from circuit-integrated Hall sensors due to their low cost, simple linear magnetic field response, ability to operate in a large magnetic field range, high magnetic sensitivity and low electronic noise, in addition to many other advantages. Recent developments in the fabrication and performance of graphene Hall devices promise to open up the realm of Hall sensor applications by not only widening the horizon of current uses through performance improvements, but also driving Hall sensor electronics into entirely new areas. In this review paper we describe the evolution from the traditional selection of Hall device materials to graphene Hall devices, and explore the various applications enabled by them. This includes a summary of the selection of materials and architectures for contemporary micro-to nanoscale Hall sensors. We then turn our attention to introducing graphene and its remarkable physical properties and explore how this impacts the magnetic sensitivity and electronic noise of graphene-based Hall sensors. We summarise the current state-of-the art of research into graphene Hall probes, demonstrating their record-breaking performance. Building on this, we explore the various new application areas graphene Hall sensors are pioneering such as magnetic imaging and non-destructive testing. Finally, we look at recent encouraging results showing that graphene Hall sensors have plenty of room to improve, before then discussing future prospects for industry-level scalable fabrication.

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“…Moreover, the above electric heating composites are generally fabricated by mixing CNTs and polymers directly, which affects the dispersibility of CNTs and their electrical performances . Some researchers attempted to fabricate a type of graphene device via encapsulating a graphene membrane by spin-coating hydrogen silsesquioxane (HSQ), rather than direct mixing; this can preserve the laminated structure of graphene sheets and effectively protect these types of devices from the ambient environment . Besides, Jiang et al reported a flexible electric heating film prepared by gap coating and plastic encapsulation; of which, they used an encapsulation layer with insulating and waterproofing properties, thereby improving the flexibility, stability, and safety of the film for various applications …”

Section: Introductionmentioning

confidence: 99%

Steady and Robust CNTs-Based Electric Heating Membrane Fabricated by Addition of Nanocellulose and Hot-Press Encapsulation

Zou

Zhuo

et al. 2021

Langmuir

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Herein, a type of biomass-based electric heating membrane (EHM) with excellent stability was fabricated; this was achieved by incorporating carbon nanotubes (CNTs) into the nanofibrillated cellulose (NFC) as a natural dispersant and a biological substrate, as well as via the control of ultrasonic dispersion, grammage, and encapsulation using poly(dimethylsiloxane) (PDMS) with hot pressing. NFC entangles with CNTs in the form of an intertwined network and non-covalent interactions to fabricate a flexible EHM with steady electric heating performance; this formation is attributed to not only their similar morphology and surface-active groups but also the use of NFC that avoids additional disturbances in the overlapped interface among CNTs as far as possible. The obtained steady resistance varies as low as 5.1% under energized operation. In the encapsulated EHM (EM), PDMS was anchored on its surface by using hot pressing and an intertwined structure to enhance flexibility and robustness. The encapsulated membrane can be used in low-voltage applications, which require flexibility, waterproofing, and insulation.

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High quality hydrogen silsesquioxane encapsulated graphene devices with edge contacts

Cited by 7 publications

References 15 publications

Electric-field-driven conductance switching in encapsulated graphene nanogaps

Electric-field-driven conductance switching in encapsulated graphene nanogaps

Frontiers of graphene-based Hall-effect sensors

Steady and Robust CNTs-Based Electric Heating Membrane Fabricated by Addition of Nanocellulose and Hot-Press Encapsulation

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