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Transition from elastic to plastic strain release in core−shell nanowires revealed by in-plane x-ray diffraction

Al Hassan, Ali 1; Salehi, Waheed A.; Lewis, Ryan B.; Anjum, Taseer; Sternemann, Christian; Geelhaar, Lutz; Pietsch, Ullrich
1 Institut für Photonenforschung und Synchrotronstrahlung (IPS), Karlsruher Institut für Technologie (KIT)

Abstract:

We investigate the strain evolution and relaxation process as function of increasing lattice mismatch between the GaAs core and surrounding InxGa$_{1-x}$As shell in core–shell nanowire heterostructures grown on Si(111) substrates. The dimensions of the core and shell are kept constant whereas the indium concentration inside the shell is varied. Measuring the $22\bar{4}$ and $2\bar{2}0$ in-plane Bragg reflections normal to the nanowire side edges and side facets, we observe a transition from elastic to plastic strain release for a shell indium content x > 0.5. Above the onset of plastic strain relaxation, indium rich mounds and an indium poor coherent shell grow simultaneously around the GaAs core. Mound formation was observed for indium contents x = 0.5 and 0.6 by scanning electron microscopy. Considering both the measured radial reflections and the axial 111 Bragg reflection, the 3D strain variation was extracted separately for the core and the InxGa$_{1-x}$As shell.


Verlagsausgabe §
DOI: 10.5445/IR/1000130151
Veröffentlicht am 21.06.2021
Originalveröffentlichung
DOI: 10.1088/1361-6528/abe5db
Scopus
Zitationen: 4
Web of Science
Zitationen: 4
Dimensions
Zitationen: 4
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Photonenforschung und Synchrotronstrahlung (IPS)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 14.05.2021
Sprache Englisch
Identifikator ISSN: 0957-4484, 1361-6528
KITopen-ID: 1000130151
HGF-Programm 56.12.11 (POF IV, LK 01) Materials - Quantum, Complex and Functional
Erschienen in Nanotechnology
Verlag Institute of Physics Publishing Ltd (IOP Publishing Ltd)
Band 32
Heft 20
Seiten Art.Nr. 205705
Vorab online veröffentlicht am 26.02.2021
Nachgewiesen in Dimensions
Scopus
Web of Science
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