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Electronic transport of encapsulated graphene and WSe2 devices fabricated by pick-up of prepatterned hBN.

We report high quality graphene and WSe sub(2) devices encapsulated between two hexagonal boron nitride (hBN) flakes using a pick-up method with etched hBN flakes. Picking up prepatterned hBN flakes to be used as a gate dielectric or mask for other 2D materials opens new possibilities for the design... Full description

Journal Title: Nano letters March 11, 2015, Vol.15(3), pp.1898-1903
Main Author: Wang, Joel I-Jan
Other Authors: Yang, Yafang , Chen, Yu-An , Watanabe, Kenji , Taniguchi, Takashi , Churchill, Hugh O H , Jarillo-Herrero, Pablo
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: E-ISSN: 1530-6992 ; DOI: 1530-6992 ; DOI: 10.1021/nl504750f
Link: http://search.proquest.com/docview/1662636496/?pq-origsite=primo
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title: Electronic transport of encapsulated graphene and WSe2 devices fabricated by pick-up of prepatterned hBN.
format: Article
creator:
  • Wang, Joel I-Jan
  • Yang, Yafang
  • Chen, Yu-An
  • Watanabe, Kenji
  • Taniguchi, Takashi
  • Churchill, Hugh O H
  • Jarillo-Herrero, Pablo
subjects:
  • Pick-Up Technique
  • Contact
  • Graphene
  • Mobility
  • Transition Metal Dichalcogenides (Tmds)
  • Two-Dimensional (2d) Heterostructures
ispartof: Nano letters, March 11, 2015, Vol.15(3), pp.1898-1903
description: We report high quality graphene and WSe sub(2) devices encapsulated between two hexagonal boron nitride (hBN) flakes using a pick-up method with etched hBN flakes. Picking up prepatterned hBN flakes to be used as a gate dielectric or mask for other 2D materials opens new possibilities for the design and fabrication of 2D heterostructures. In this Letter, we demonstrate this technique in two ways: first, a dual-gated graphene device that is encapsulated between an hBN substrate and prepatterned hBN strips. The conductance of the graphene device shows pronounced Fabry-Perot oscillations as a function of carrier density, which implies strong quantum confinement and ballistic transport in the locally gated region. Second, we describe a WSe sub(2) device encapsulated in hBN with the top hBN patterned as a mask for the channel of a Hall bar. Ionic liquid selectively tunes the carrier density of the contact region of the device, while the hBN mask allows independent tunability of the contact region for low contact resistance. Hall mobility larger than 600 cm super(2)/(V.s) for few-layer p-type WSe sub(2) at 220 K is measured, the highest mobility of a thin WSe sub(2) device reported to date. The observations of ballistic transport in graphene and high mobility in WSe sub(2) confirm pick-up of prepatterned hBN as a versatile technique to fabricate ultraclean devices with high quality contact. Keywords: Pick-up technique; two-dimensional (2D) heterostructures; graphene; transition metal dichalcogenides (TMDs); contact; mobility
language: eng
source:
identifier: E-ISSN: 1530-6992 ; DOI: 1530-6992 ; DOI: 10.1021/nl504750f
fulltext: no_fulltext
issn:
  • 15306992
  • 1530-6992
url: Link


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titleElectronic transport of encapsulated graphene and WSe2 devices fabricated by pick-up of prepatterned hBN.
creatorWang, Joel I-Jan ; Yang, Yafang ; Chen, Yu-An ; Watanabe, Kenji ; Taniguchi, Takashi ; Churchill, Hugh O H ; Jarillo-Herrero, Pablo
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descriptionWe report high quality graphene and WSe sub(2) devices encapsulated between two hexagonal boron nitride (hBN) flakes using a pick-up method with etched hBN flakes. Picking up prepatterned hBN flakes to be used as a gate dielectric or mask for other 2D materials opens new possibilities for the design and fabrication of 2D heterostructures. In this Letter, we demonstrate this technique in two ways: first, a dual-gated graphene device that is encapsulated between an hBN substrate and prepatterned hBN strips. The conductance of the graphene device shows pronounced Fabry-Perot oscillations as a function of carrier density, which implies strong quantum confinement and ballistic transport in the locally gated region. Second, we describe a WSe sub(2) device encapsulated in hBN with the top hBN patterned as a mask for the channel of a Hall bar. Ionic liquid selectively tunes the carrier density of the contact region of the device, while the hBN mask allows independent tunability of the contact region for low contact resistance. Hall mobility larger than 600 cm super(2)/(V.s) for few-layer p-type WSe sub(2) at 220 K is measured, the highest mobility of a thin WSe sub(2) device reported to date. The observations of ballistic transport in graphene and high mobility in WSe sub(2) confirm pick-up of prepatterned hBN as a versatile technique to fabricate ultraclean devices with high quality contact. Keywords: Pick-up technique; two-dimensional (2D) heterostructures; graphene; transition metal dichalcogenides (TMDs); contact; mobility
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