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Is graphene on copper doped?

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Marsden, Alexander J., Asensio, Maria-Carmen, Avila, José, Dudin, Pavel, Barinov, Alexei, Moras, Paolo, Sheverdyaeva, Polina M., White, T. W., Maskery, Ian, Costantini, Giovanni, Wilson, Neil R. and Bell, Gavin R. (2013) Is graphene on copper doped? physica status solidi (RRL) - Rapid Research Letters, 7 (9). pp. 643-646. doi:10.1002/pssr.201307224 ISSN 1862-6254.

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Official URL: http://dx.doi.org/10.1002/pssr.201307224

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Abstract

Angle-resolved photoemission spectroscopy (ARPES) and X-ray photoemission spectroscopy have been used to characterise epitaxially ordered graphene grown on copper foil by low-pressure chemical vapour deposition. A short vacuum anneal to 200 °C allows observation of ordered low energy electron diffraction patterns. High quality Dirac cones are measured in ARPES with the Dirac point at the Fermi level (undoped graphene). Annealing above 300 °C produces n-type doping in the graphene with up to 350 meV shift in Fermi level, and opens a band gap of around 100 meV.

Dirac cone dispersion for graphene on Cu foil after vacuum anneals (left: 200 °C, undoped; right: 500 °C, n-doped). Centre: low energy electron diffraction from graphene on Cu foil after 200 °C anneal. Data from Antares (SOLEIL).

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Graphene , Copper foil, Copper, Photoemission , Dirac equation
Journal or Publication Title: physica status solidi (RRL) - Rapid Research Letters
Publisher: Wiley - V C H Verlag GmbH & Co. KGaA
ISSN: 1862-6254
Official Date: September 2013
Dates:
DateEvent
September 2013Published
Volume: 7
Number: 9
Page Range: pp. 643-646
DOI: 10.1002/pssr.201307224
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)
Date of first compliant deposit: 25 December 2015
Date of first compliant Open Access: 25 December 2015
Funder: Engineering and Physical Sciences Research Council (EPSRC), Seventh Framework Programme (European Commission) (FP7), European Science Foundation (ESF)
Grant number: EP/F034210/1, EP/G044864/1, EP/K005200/1 (EPSRC)

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