Hexagonal Boron Nitride Tunnel Barriers Grown on Graphite by High Temperature Molecular Beam Epitaxy.
We demonstrate direct epitaxial growth of high-quality hexagonal boron nitride (hBN) layers on graphite using high-temperature plasma-assisted molecular beam epitaxy. Atomic force microscopy reveals mono- and few-layer island growth, while conducting atomic force microscopy shows that the grown hBN has a resistance which increases exponentially with the number of layers, and has electrical properties comparable to exfoliated hBN. X-ray photoelectron spectroscopy, Raman microscopy and spectroscopic ellipsometry measurements on hBN confirm the formation of sp2-bonded hBN and a band gap of 5.9 ± 0.1 eV with no chemical intermixing with graphite. We also observe hexagonal moiré patterns with a period of 15 nm, consistent with the alignment of the hBN lattice and the graphite substrate.
School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK.
Yong-Jin
YJ
Cho
School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK.
Alex
A
Summerfield
School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK.|School of Chemistry, University of Nottingham, Nottingham NG7 2RD, UK.
Andrew
A
Davies
School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK.
Tin S
TS
Cheng
School of Chemistry, University of Nottingham, Nottingham NG7 2RD, UK.|Nottingham Nanoscale and Microscale Research Centre, University of Nottingham, Nottingham NG7 2RD, UK.
Emily F
EF
Smith
School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK.
Christopher J
CJ
Mellor
School of Chemistry, University of Nottingham, Nottingham NG7 2RD, UK.|Nottingham Nanoscale and Microscale Research Centre, University of Nottingham, Nottingham NG7 2RD, UK.
Andrei N
AN
Khlobystov
School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK.
C Thomas
CT
Foxon
School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK.
Laurence
L
Eaves
School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK.
Peter H
PH
Beton
School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK.
Sergei V
SV
Novikov
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