期刊
APPLIED PHYSICS LETTERS
卷 93, 期 7, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.2966343
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资金
- MEXT of Japan [20244044, 17-5056]
- Grants-in-Aid for Scientific Research [20244044] Funding Source: KAKEN
We study optical transitions from a periodic array of InP/InAs/InP core-multishell nanowires (CMNs) having a wurtzite crystal structure by using photoluminescence (PL) and PL excitation (PLE) spectroscopy. Observing a large Stokes shift between PL and PLE spectra, a blueshift of the PL peak with a cube-root dependence on the excitation power and a slow and nonexponential decay of PL with an effective decay time of 16 ns suggest a type-II band alignment. Band-offset calculation based on the model-solid theory of Van de Walle [Phys. Rev. B 39, 1871 (1989)] supports type-II band lineup if the InAs layer in the wurtzite CMNs is assumed to sustain compressive strain in all directions. (C) 2008 American Institute of Physics.
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