期刊
NANOTECHNOLOGY
卷 31, 期 21, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/ab7590
关键词
optical and structural correlation; core-multi-shell nanowires; cathodoluminescence spectroscopy; synchrotron nano x-ray diffraction; as-grown geometry
资金
- Deutsche Forschungsgemeinschaft [Pi217/38, Ge2224/2]
- Alexander von Humboldt Foundation
We report on the direct correlation between the structural and optical properties of single, as-grown core-multi-shell GaAs/In0.15Ga0.85As/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.
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