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Open Access Nano Express

Structure and photovoltaic properties of ZnO nanowire for dye-sensitized solar cells

Ming-Cheng Kao1*, Hone-Zern Chen1, San-Lin Young1, Chen-Cheng Lin2 and Chung-Yuan Kung2

Author Affiliations

1 Department of Electronic Engineering, Hsiuping University of Science and Technology, Taichung, 412, Taiwan

2 Department of Electrical Engineering, National Chung Hsing University, Taichung, 402, Taiwan

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Nanoscale Research Letters 2012, 7:260  doi:10.1186/1556-276X-7-260

Published: 18 May 2012

Abstract

Aligned ZnO nanowires with different lengths (1 to approximately 4 μm) have been deposited on indium titanium oxide-coated glass substrates by using the solution phase deposition method for application as a work electrode in dye-sensitized solar cells (DSSC). From the results, the increases in length of zinc oxide (ZnO) nanowires can increase adsorption of the N3 dye through ZnO nanowires to improve the short-circuit photocurrent (Jsc) and open-circuit voltage (Voc), respectively. However, the Jsc and Voc values of DSSC with ZnO nanowires length of 4.0 μm (4.8 mA/cm2 and 0.58 V) are smaller than those of DSSC with ZnO nanowires length of 3.0 μm (5.6 mA/cm2 and 0.62 V). It could be due to the increased length of ZnO nanowires also resulted in a decrease in the transmittance of ZnO nanowires thus reducing the incident light intensity on the N3 dye. Optimum power conversion efficiency (η) of 1.49% was obtained in a DSSC with the ZnO nanowires length of 3 μm.

Keywords:
ZnO; Nanowires; DSSC; Open-circuit voltage