Three-Dimensional Composition and Electric Potential Mapping of III-V Core-Multishell Nanowires by Correlative STEM and Holographic Tomography

Nano Letters
Daniel WolfAxel Lubk

Abstract

The nondestructive characterization of nanoscale devices, such as those based on semiconductor nanowires, in terms of functional potentials is crucial for correlating device properties with their morphological/materials features, as well as for precisely tuning and optimizing their growth process. Electron holographic tomography (EHT) has been used in the past to reconstruct the total potential distribution in three-dimension but hitherto lacked a quantitative approach to separate potential variations due to chemical composition changes (mean inner potential, MIP) and space charges. In this Letter, we combine and correlate EHT and high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) tomography on an individual ⟨111⟩ oriented GaAs-AlGaAs core-multishell nanowire (NW). We obtain excellent agreement between both methods in terms of the determined Al concentration within the AlGaAs shell, as well as thickness variations of the few nanometer thin GaAs shell acting as quantum well tube. Subtracting the MIP determined from the STEM tomogram, enables us to observe functional potentials at the NW surfaces and at the Au-NW interface, both ascribed to surface/interface pinning of the semiconductor Fermi level.

References

Aug 15, 1993·Physical Review. B, Condensed Matter·M D PashleyP D Kirchner
Jan 21, 2003·Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·Walt G FisherEric A Wachter
Mar 25, 2009·Nature Materials·Paul A Midgley, Rafal E Dunin-Borkowski
Sep 29, 2009·Nano Letters·Martien I den HertogWalter Riess
Apr 10, 2010·Nano Letters·Katsuhiro TomiokaTakashi Fukui
Mar 23, 2013·Nano Letters·Daniel RudolphGregor Koblmüller
Jun 28, 2013·Nano Letters·Changlin ZhengJoanne Etheridge
Jul 6, 2014·Ultramicroscopy·Florian GenzMichael Lehmann
May 18, 2016·Chemistry of Materials : a Publication of the American Chemical Society·Daniel WolfEtienne Snoeck
Jun 3, 2016·Nano Letters·Ali DarbandiKaren L Kavanagh
Mar 25, 2017·Nano Letters·Ana M SanchezRichard Beanland
Sep 15, 2017·Nano Letters·M H T DastjerdiR R LaPierre
Nov 9, 2017·Nano Letters·Reza R ZamaniKimberly A Dick

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Methods Mentioned

BETA
transmission electron microscopy
electron holography
imaging techniques
electron holographic tomography
electron tomography
electron
X-ray
dynamical scattering

Software Mentioned

EHT

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