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Proceedings Paper

Growth orientations and crystal structures of ZnO nanoneedles using Ag nanoparticles as catalyst in vapor-liquid-solid growth (Conference Presentation)
Author(s): Yu-Feng Yao; Chi-Ming Weng; Shaobo Yang; Huang-Hui Lin; Chen-Yao Chao; Hao-Tsung Chen; Yean-Woei Kiang; Chih-Chung Yang

Paper Abstract

The controlling mechanism for determining the growth direction of a Ga-doped ZnO (GaZnO) nanoneedle (NN) by using an Ag nanoparticle (NP) as vapor-liquid-solid (VLS) growth catalyst is disclosed. It is found that the local Ag (111) orientation of the catalytic Ag portion in an Ag NP determines the ZnO (002) orientation of the grown GaZnO and hence the NN growth direction. The ZnO (002) plane of the grown GaZnO is always parallel with the Ag (111) planes of the Ag portions involved in VLS growth in either the top or bottom Ag NP of an NN. When GaN is used as NN growth template, at a sufficiently high temperature (350-450 degrees C), a small Ag NP can become a quasi-single crystal with its Ag (111) plane consistent with the GaN (002) plane and hence results in the growth of a vertical GaZnO NN. However, tilted NNs can be grown from a larger Ag NP or a cluster of Ag NP on GaN due to its non-uniform Ag (111) orientation distribution. At the early stage of GaZnO growth, GaZnO precipitation can be observed between Ag layers within an Ag NP, indicating the growth of a semiconductor on Ag. On other templates, like Si, sapphire, or silicon diode, single-crystal Ag NP cannot be formed such that GaZnO NNs of random orientations are grown.

Paper Details

Date Published: 19 April 2017
PDF: 1 pages
Proc. SPIE 10105, Oxide-based Materials and Devices VIII, 101050W (19 April 2017); doi: 10.1117/12.2249541
Show Author Affiliations
Yu-Feng Yao, National Taiwan Univ. (Taiwan)
Chi-Ming Weng, National Taiwan Univ. (Taiwan)
Shaobo Yang, National Taiwan Univ. (Taiwan)
Huang-Hui Lin, National Taiwan Univ. (Taiwan)
Chen-Yao Chao, National Taiwan Univ. (Taiwan)
Hao-Tsung Chen, National Taiwan Univ. (Taiwan)
Yean-Woei Kiang, National Taiwan Univ. (Taiwan)
Chih-Chung Yang, National Taiwan Univ. (Taiwan)

Published in SPIE Proceedings Vol. 10105:
Oxide-based Materials and Devices VIII
Ferechteh H. Teherani; David C. Look; David J. Rogers, Editor(s)

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