Self-organized growth of Si/Silica/Er2Si2O7 core-shell nanowire heterostructures and their luminescence

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Self-organized Si-Er heterostructure nanowires showed promising 1.54 mu m Er3+ optical activity. Si nanowires of about 120-nm diameter were grown vertically on Si substrates by the vapor-liquid-solid mechanism in an Si-Er-Cl-H-2 system using an Au catalyst. Meanwhile, a single-crystalline Er2Si2O7 shell sandwiched between nanometer-thin amorphous silica shells was self-organized on the surface of Si nanowires. The nanometer-thin heterostructure shells make it possible to observe a carrier-mediated 1.53 mu m Er3(+) photoluminescence spectrum consisting of a series of very sharp peaks. The Er3+ spectrum and intensity showed absolutely no change as the temperature was increased from 25 to 300 K. The luminescence lifetime at room temperature was found to be 70 mu s. The self-organized Si nanowires show great potential as the material basis for developing an Si-based Er light source.
Publisher
AMER CHEMICAL SOC
Issue Date
2005-12
Language
English
Article Type
Article
Keywords

ERBIUM-DOPED SILICON; SI/SIO2 SUPERLATTICES; OPTICAL ACTIVATION; ER3+ LUMINESCENCE; ENERGY-TRANSFER; CRYSTALLINE SI; THIN-FILMS; ELECTROLUMINESCENCE; EXCITATION; NANOCRYSTALS

Citation

NANO LETTERS, v.5, pp.2432 - 2437

ISSN
1530-6984
DOI
10.1021/nl051684h
URI
http://hdl.handle.net/10203/91550
Appears in Collection
NT-Journal Papers(저널논문)
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