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Measurements of Strain and Bandgap of Coherently Epitaxially Grown Wurtzite InAsP-InP Core-Shell Nanowires
Lund Univ, Sweden.
Lund Univ, Sweden.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
Lund Univ, Sweden.
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2019 (English)In: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 19, no 4, p. 2674-2681Article in journal (Refereed) Published
Abstract [en]

We report on experimental determination of the strain and bandgap of InAsP in epitaxially grown InAsP-InP core-shell nanowires. The core-shell nanowires are grown via metal-organic vapor phase epitaxy. The as-grown nanowires are characterized by transmission electron microscopy, X-ray diffraction, micro-photoluminescence (mu PL) spectroscopy, and micro-Raman (mu-Raman) spectroscopy measurements. We observe that the core-shell nanowires are of wurtzite (WZ) crystal phase and are coherently strained with the core and the shell having the same number of atomic planes in each nanowire. We determine the predominantly uniaxial strains formed in the core-shell nanowires along the nanowire growth axis and demonstrate that the strains can be described using an analytical expression. The bandgap energies in the strained WZ InAsP core materials are extracted from the mu PL measurements of individual core-shell nanowires. The coherently strained core-shell nanowires demonstrated in this work offer the potentials for use in constructing novel optoelectronic devices and for development of piezoelectric photovoltaic devices.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2019. Vol. 19, no 4, p. 2674-2681
Keywords [en]
Strain; core-shell nanowire; wurtzite; InAsP; InP; mu PL; mu-Raman
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-157241DOI: 10.1021/acs.nanolett.9b00644ISI: 000464769100066PubMedID: 30908918Scopus ID: 2-s2.0-85064175484OAI: oai:DiVA.org:liu-157241DiVA, id: diva2:1324200
Note

Funding Agencies|Myfab; Swedish Research Council (VR); Ministry of Science and Technology of China through the National Key Research and Development Program of China [2017YFA0303304, 2016YFA0300601]; National Natural Science Foundation of China [11874071, 91221202, 91421303]

Available from: 2019-06-13 Created: 2019-06-13 Last updated: 2019-06-18Bibliographically approved

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Huang, YuqingBuyanova, Irina AChen, Weimin

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