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Nanotechnology. 2010 Nov 26;21(47):475703. doi: 10.1088/0957-4484/21/47/475703. Epub 2010 Oct 29.

Vertically aligned ZnO/amorphous-Si core-shell heterostructured nanowire arrays.

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  • 1Department of Physics, The Hong Kong University of Science and Technology, Hong Kong, People's Republic of China.

Abstract

We report the synthesis of vertically aligned ZnO/a-Si core-shell nanowire arrays (ZnO nanowires coated with amorphous silicon) through chemical vapor deposition. The core-shell heterostructured nanowires possessed uniform morphology and the thickness of the amorphous silicon shells could be controlled easily by tuning the deposition duration and temperature. The core-shell heterostructured nanowires exhibited enhanced antireflection and absorption performance as well as tunable PL properties. Because the individual ZnO/a-Si nanowires showed p-type characteristics and the ZnO cores were n-type semiconductors, the core-shell nanowires formed p-n junctions naturally.

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