Open Access Nano Express

Growth and optical properties of ZnO nanorod arrays on Al-doped ZnO transparent conductive film

Suanzhi Lin1, Hailong Hu2, Weifeng Zheng1, Yan Qu1 and Fachun Lai1*

Author Affiliations

1 College of Physics and Energy, Fujian Normal University, Fuzhou 350108, People’s Republic of China

2 Analytical and Testing Center, Southwest University of Science and Technology, Mianyang 621010, People’s Republic of China

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Nanoscale Research Letters 2013, 8:158  doi:10.1186/1556-276X-8-158

Published: 8 April 2013

Abstract

ZnO nanorod arrays (NRAs) on transparent conductive oxide (TCO) films have been grown by a solution-free, catalyst-free, vapor-phase synthesis method at 600°C. TCO films, Al-doped ZnO films, were deposited on quartz substrates by magnetron sputtering. In order to study the effect of the growth duration on the morphological and optical properties of NRAs, the growth duration was changed from 3 to 12 min. The results show that the electrical performance of the TCO films does not degrade after the growth of NRAs and the nanorods are highly crystalline. As the growth duration increases from 3 to 8 min, the diffuse transmittance of the samples decreases, while the total transmittance and UV emission enhance. Two possible nanorod self-attraction models were proposed to interpret the phenomena in the sample with 9-min growth duration. The sample with 8-min growth duration has the highest total transmittance of 87.0%, proper density about 75 μm−2, diameter about 26 nm, and length about 500 nm, indicating that it can be used in hybrid solar cells.

Keywords:
ZnO nanorod; Al-doped ZnO films; Catalyst-free growth; Optical properties; 81.07.-b; 61.46.Km; 78.67.-n