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ZnO/Al2O3 Core-shell Nanorod Arrays: Processing, Structural Characterization, and Luminescent Property

Published online by Cambridge University Press:  01 February 2011

Cheng-Ying Chen,
Chin-An Lin,
Miin-Jang Chen,
Gong-Ru Lin and
Jr-Hau He
Cheng-Ying Chen
Affiliation:
d94941017@ntu.edu.tw, National Taiwan University, Graduate Institute of Photonics and Optoelectronics, Taipei, United States
Chin-An Lin
Affiliation:
r95941090@ntu.edu.tw, National Taiwan University, Graduate Institute of Photonics and Optoelectronics, Taipei, Taiwan, Province of China
Miin-Jang Chen
Affiliation:
mjchen@ntu.edu.tw, National Taiwan University, Department of Materials Science and Engineering, Taipei, Taiwan, Province of China
Gong-Ru Lin
Affiliation:
grlin@cc.ee.ntu.edu.tw, National Taiwan University, Graduate Institute of Photonics and Optoelectronics, Taipei, Taiwan, Province of China
Jr-Hau He
Affiliation:
jhhe@cc.ee.ntu.edu.tw, Institute of Photonics and Optoelectronics & Department of Electrical Engineering National Taiwan University, Taipei, Taiwan, Province of China
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Abstract

We reported the aqueous chemical method to fabricate the well-aligned ZnO/Al2O3 core-shell nanorod arrays (NRAs). The shell is composed of α-Al2O3 nanocrystals in amorphous Al2O3 layers. The photoluminescence (PL) measurements showed that the enhancement of near-band-edge emission in ZnO NRAs arrays due to the addition of Al2O3 shell was observed. The Al2O3 shell layer resulting in flatband effect near ZnO surface leads to a stronger overlap of the wavefunctions of electrons and holes in the ZnO core, further enhancing the NBE emission.

Keywords

II-VIluminescencenanostructure

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