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Open Access Nano Express

Growth and characterization of ZnO/ZnTe core/shell nanowire arrays on transparent conducting oxide glass substrates

YuWei Lin1, Wei-Jen Chen2, Jiun You Lu2, Yuan Huei Chang12*, Chi-Te Liang12*, Yang Fang Chen12 and Jing-Yu Lu2

Author Affiliations

1 Graduate Institute of Applied Physics, National Taiwan University, Taipei, 10617, Taiwan

2 Department of Physics, National Taiwan University, Taipei, 10617, Taiwan

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Nanoscale Research Letters 2012, 7:401  doi:10.1186/1556-276X-7-401

Published: 17 July 2012

Abstract

We report the growth and characterization of ZnO/ZnTe core/shell nanowire arrays on indium tin oxide. Coating of the ZnTe layer on well-aligned vertical ZnO nanowires has been demonstrated by scanning electron microscope, tunneling electron microscope, X-ray diffraction pattern, photoluminescence, and transmission studies. The ZnO/ZnTe core/shell nanowire arrays were then used as the active layer and carrier transport medium to fabricate a photovoltaic device. The enhanced photocurrent and faster response observed in ZnO/ZnTe, together with the quenching of the UV emission in the PL spectra, indicate that carrier separation in this structure plays an important role in determining their optical response. The results also indicate that core/shell structures can be made into useful photovoltaic devices.

Keywords:
ZnO/ZnTe core/shell nanowire arrays; indium tin oxide; glass substrates