期刊
APPLIED PHYSICS LETTERS
卷 100, 期 12, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3696044
关键词
density functional theory; nanostructured materials; photoluminescence; tin compounds; vacancies (crystal); valence bands; wide band gap semiconductors
资金
- National Natural Science Foundation [2011CB922102, 60976063]
- Basic Research Programs of China [2011CB922102, 60976063]
- Hong Kong Research Grants Council (RGC) [CityU 112510]
A double peak in the violet region between 360 and 400 nm is observed from the photoluminescence spectra acquired from cuboid SnO2 nanocrystals and the energy separation between the two subpeaks increases with nanocrystal size. The phenomenon arises from band edge recombination caused by different in-depth distributions of oxygen vacancies (OVs). Density functional theory calculations disclose that variations in the oxygen vacancies with depth introduce valence-band peak splitting leading to the observed splitting and shift of the double peak. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3696044]
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