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Title: Photoluminescence and multiphonon resonant Raman scattering in low-temperature grown ZnO nanostructures
Authors: Kumar, B. 
Gong, H. 
Chow, S.Y.
Tripathy, S.
Hua, Y.
Issue Date: 2006
Citation: Kumar, B., Gong, H., Chow, S.Y., Tripathy, S., Hua, Y. (2006). Photoluminescence and multiphonon resonant Raman scattering in low-temperature grown ZnO nanostructures. Applied Physics Letters 89 (7) : -. ScholarBank@NUS Repository.
Abstract: The authors report on the optical properties of nanocrystalline ZnO grown at 200°C by radio-frequency magnetron sputtering. The nanocrystalline nature of the films was confirmed by cross-sectional transmission electron microscopy. In these films, ZnO nanocrystals with an average size of about 3-5 nm were embedded in an amorphous matrix. The photoluminescence spectra from such nanostructured thin films show the near-band-edge emissions around 3.3 eV. A redshift of about 8-11 cm-1 is observed in the case of first-order longitudinal-optical (LO) phonon of ZnO in such nanostructures when compared to the LO phonon peak of bulk ZnO. The ultraviolet resonant Raman excitation at 77 K shows multiphonon LO modes up to eighth order. © 2006 American Institute of Physics.
Source Title: Applied Physics Letters
ISSN: 00036951
DOI: 10.1063/1.2336997
Appears in Collections:Staff Publications

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