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Strong Schottky barrier reduction at Au-catalyst/GaAs-nanowire interfaces by electric dipole formation and Fermi-level unpinning
Division of Solid State Physics, Nanometer Structure Consortium, Lund University, Lund, Sweden.
Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), MPE-lab. Division of Solid State Physics, Nanometer Structure Consortium, Lund University, Lund, Sweden. (Nanovetenskap)ORCID iD: 0000-0001-5993-8106
Voronezh State Technical University, Voronezh, Russian Federation.
Division of Solid State Physics, Nanometer Structure Consortium, Lund University, Lund, Sweden. (Nanometerkonsortiet)
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2014 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 5, 3221Article in journal (Refereed) Published
Abstract [en]

Nanoscale contacts between metals and semiconductors are critical for further downscaling of electronic and optoelectronic devices. However, realizing nanocontacts poses significant challenges since conventional approaches to achieve ohmic contacts through Schottky barrier suppression are often inadequate. Here we report the realization and characterization of low n-type Schottky barriers (∼0.35 eV) formed at epitaxial contacts between Au-In alloy catalytic particles and GaAs-nanowires. In comparison to previous studies, our detailed characterization, employing selective electrical contacts defined by high-precision electron beam lithography, reveals the barrier to occur directly and solely at the abrupt interface between the catalyst and nanowire. We attribute this lowest-to-date-reported Schottky barrier to a reduced density of pinning states (∼10 17 m-2) and the formation of an electric dipole layer at the epitaxial contacts. The insight into the physical mechanisms behind the observed low-energy Schottky barrier may guide future efforts to engineer abrupt nanoscale electrical contacts with tailored electrical properties. © 2014 Macmillan Publishers Limited.

Place, publisher, year, edition, pages
London: Nature Publishing Group, 2014. Vol. 5, 3221
Keyword [en]
Nanoschottky contact, Nanophotonics, Nanoelectronics, Electric dipole formation, Fermi-level unpinning
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:hh:diva-25042DOI: 10.1038/ncomms4221ISI: 000332664900002PubMedID: 24488034Scopus ID: 2-s2.0-84893862090OAI: oai:DiVA.org:hh-25042DiVA: diva2:712188
Available from: 2014-04-14 Created: 2014-04-14 Last updated: 2016-01-25Bibliographically approved

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CiteExportLink to record
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