Photoluminescence and multiphonon resonant Raman scattering in low-temperature grown ZnO nanostructures

被引：98

作者：

Kumar, Bhupendra ^{[1
]}

Gong, Hao

Chow, Shue Yin

Tripathy, Sudhiranjan

Hua, Younan

机构：

[1] Natl Univ Singapore, Dept Mat Sci & Engn, Singapore 119260, Singapore

[2] Inst Mat Res & Engn, Singapore 117602, Singapore

[3] Chartered Semicond Mfg Ltd, Singapore 738406, Singapore

来源：

APPLIED PHYSICS LETTERS | 2006年 / 89卷 / 07期

关键词：

D O I：

10.1063/1.2336997

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The authors report on the optical properties of nanocrystalline ZnO grown at 200 degrees 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. (c) 2006 American Institute of Physics.

引用

页数：3

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