Defects in h-BN tunnel barrier for local electrostatic probing of two dimensional materials

Ying Liu, Zhenbing Tan, Manohar Kumar, Abhilash Thanniyil Sebastian, Guan-jun Liu, Pertti Hakonen

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)

Abstract

Defects in the hexagonal boron nitride (h-BN) layer can facilitate the tunneling current through thick h-BN tunneling barriers. We have investigated such current-mediating defects as local probes for materials in two dimensional heterostructure stacks. Besides IV characteristics and negative differential conductance, we have characterized the electrical properties of h-BN defects in vertical graphene-h-BN-Cr/Au tunnel junctions in terms of low frequency current noise. Our results indicate a charge sensitivity of 1.5×10-5 e/Hz at 10 Hz, which is equal to good metallic single electron transistors. The noise spectra at low frequency are governed by a few two-level fluctuators. For variations in the electrochemical potential, we achieve a sensitivity of 0.8 μeV/Hz.

Original languageEnglish
Article number0911021
JournalAPL Materials
Volume6
Issue number9
DOIs
Publication statusPublished - 11 Sep 2018
MoE publication typeA1 Journal article-refereed

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Boron nitride
Electrostatics
Tunnels
Defects
Single electron transistors
Graphite
Tunnel junctions
Graphene
Heterojunctions
Electric properties
boron nitride

Cite this

Liu, Ying ; Tan, Zhenbing ; Kumar, Manohar ; Thanniyil Sebastian, Abhilash ; Liu, Guan-jun ; Hakonen, Pertti. / Defects in h-BN tunnel barrier for local electrostatic probing of two dimensional materials. In: APL Materials. 2018 ; Vol. 6, No. 9.
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Defects in h-BN tunnel barrier for local electrostatic probing of two dimensional materials. / Liu, Ying; Tan, Zhenbing; Kumar, Manohar; Thanniyil Sebastian, Abhilash; Liu, Guan-jun; Hakonen, Pertti.

In: APL Materials, Vol. 6, No. 9, 0911021, 11.09.2018.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Tan, Zhenbing

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AU - Liu, Guan-jun

AU - Hakonen, Pertti

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