Surface structure promoted high-yield growth and magnetotransport properties of Bi2 Se3 nanoribbons

Scientific Reports
Gunta KunakovaDonats Erts

Abstract

In the present work, a catalyst-free physical vapour deposition method is used to synthesize high yield of Bi2Se3 nanoribbons. By replacing standard glass or quartz substrates with aluminium covered with ultrathin porous anodized aluminium oxide (AAO), the number of synthesized nanoribbons per unit area can be increased by 20-100 times. The mechanisms of formation and yield of the nanoribbons synthesized on AAO substrates having different arrangement and size of pores are analysed and discussed. It is shown that the yield and average length of the nanoribbons can base tuned by adjustment of the synthesis parameters. Analysis of magnetotransport measurements for the individual Bi2Se3 nanoribbons transferred on a Si/SiO2 substrate show the presence of three different populations of charge carriers, originating from the Dirac surface states, bulk carriers and carriers from a trivial 2DEG from an accumulation layer at the Bi2Se3 nanoribbon interface with the substrate.

References

Aug 12, 2004·The Journal of Physical Chemistry. B·Jiansheng JieJ G Hou
Dec 25, 2009·Nano Letters·Desheng KongYi Cui
Aug 30, 2012·Nature Methods·Caroline A SchneiderKevin W Eliceiri
Oct 20, 2015·Nano Letters·Louis VeyratRomain Giraud

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Methods Mentioned

BETA
X-ray
chip
electron beam lithography

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