Spatially-resolved luminescence and crystal structure of single core-shell nanowires measured in the as-grown geometry
| Autor: | Ullrich Pietsch, Arman Davtyan, Tobias U. Schülli, Ryan B. Lewis, Michael Niehle, Hanno Küpers, Jonas Lähnemann, Florian Bertram, Danial Bahrami, Steven J. Leake, Ali AlHassan, Lutz Geelhaar |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Scanning electron microscope Nanowire Physics::Optics FOS: Physical sciences Bioengineering Geometry Cathodoluminescence 02 engineering and technology Applied Physics (physics.app-ph) 010402 general chemistry 01 natural sciences Condensed Matter::Materials Science Mesoscale and Nanoscale Physics (cond-mat.mes-hall) General Materials Science ddc:530 Electrical and Electronic Engineering Wurtzite crystal structure Condensed Matter - Materials Science Condensed Matter - Mesoscale and Nanoscale Physics Mechanical Engineering Bragg's law Materials Science (cond-mat.mtrl-sci) Physics - Applied Physics General Chemistry 021001 nanoscience & nanotechnology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 0104 chemical sciences Blueshift Mechanics of Materials Transmission electron microscopy 0210 nano-technology Molecular beam epitaxy |
| Zdroj: | Nanotechnology 31(21), 1-7 (2020). doi:10.1088/1361-6528/ab7590 |
| ISSN: | 1361-6528 |
| DOI: | 10.48550/arxiv.2002.08172 |
| Popis: | Nanotechnology 31(21), 1-7 (2020). doi:10.1088/1361-6528/ab7590 We report on the direct correlation between the structural and optical properties of single, as-grown core-multi-shell GaAs/In$_{0.15}$Ga$_{0.85}$As/GaAs/AlAs/GaAs nanowires. Fabricated by molecular beam epitaxy on a pre-patterned Si(111) substrate, on a row of well separated nucleation sites, it was possible to access individual nanowires in the as-grown geometry. The polytype distribution along the growth axis of the nanowires was revealed by synchrotron-based nanoprobe x-ray diffraction techniques monitoring the axial 111 Bragg reflection. For the same nanowires, the spatially-resolved emission properties were obtained by cathodoluminescence hyperspectral linescans in a scanning electron microscope. Correlating both measurements, we reveal a blueshift of the shell quantum well emission energy combined with an increased emission intensity for segments exhibiting a mixed structure of alternating wurtzite and zincblende stacking compared with the pure crystal polytypes. The presence of this mixed structure was independently confirmed by cross-sectional transmission electron microscopy. Published by IOP Publ., Bristol |
| Databáze: | OpenAIRE |
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