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Growth and characterization of type II ZnO/ZnSe core/shell nanowire arrays

Published online by Cambridge University Press:  31 January 2011

Jinjian Zheng ,
Zhiming Wu ,
Weihuang Yang ,
Shuping Li  and
Junyong Kang
Junyong Kang*
Affiliation:
Fujian Key Laboratory of Semiconductor Materials and Applications, Department of Physics, Xiamen University, Xiamen 361005, People's Republic of China
*
b)Address all correspondence to this author. e-mail: jykang@xmu.edu.cn
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Abstract

Type II ZnO/ZnSe core/shell nanowire arrays were grown by a two-step chemical vapor deposition. The nanowire arrays with dense nanoislands on the surface are well aligned and normal to the substrate imaged by scanning electron microscopy. The core/shell structure of nanowires was identified by a high-resolution transmission electron microscopy. The structure and composition of the shell were confirmed to be wurtzite ZnSe by x-ray diffraction, Raman scattering and energy-dispersive x-ray spectroscopy. Moreover, an intense emission was observed at 1.89 eV smaller than the band gaps of core and shell materials by photoluminescence, indicating the achievement of the type II band alignment at the interface. This study is expected to contribute to the potential applications in novel photovoltaic devices.

Keywords

NanostructurePhotoemissionCore/shell
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 7 , July 2010 , pp. 1272 - 1277
Copyright
Copyright © Materials Research Society 2010

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