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SOLAR ENERGY R&D IN ASIA

One-Dimensional Nanostructure Arrays for Dye-Sensitized Solar Cells

[+] Author and Article Information
Patcharee Charoensirithavorn, Takashi Sagawa, Susumu Yoshikawa

Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan

Shuzi Hayase

Department of Life Science and Systems Engineering, Kyushu Institute of Technology, Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan

J. Sol. Energy Eng 133(1), 011101 (Jan 24, 2011) (6 pages) doi:10.1115/1.4001153 History: Received December 25, 2008; Revised August 06, 2009; Published January 24, 2011; Online January 24, 2011

This article reports the fabrication of ordered arrays of ZnO nanorods and TiO2 nanotubules by using a simple solution-based method and the application of these arrays as the working electrodes in dye-sensitized solar cells (DSCs) with an aim of offering superior electron transport conduits than in the conventional nanocrystalline nanoparticle films. The faster charge transport and lower recombination properties of one-dimensional (1D) nanostructure array electrodes as compared with those of the nanoparticle one observed and proved that such arrays of 1D nanostructure are the more promising electrode for DSCs in the future.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

SEM images of (a) ZnO nanorods and (b) TiO2 nanotubes grown on FTO substrate. The inset shows TiO2 nanotubes after calcination at 500 °C.

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Figure 2

XRD diffraction patterns of (a) ZnO and (b) as-synthesized TiO2 on the FTO ( ∗=FTO)

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Figure 3

(a) Photocurrent-voltage (I-V) and (b) incident photon-to-current conversion efficiency (IPCE) curves for DSCs with ZnO nanorod (◆) and TiO2 nanotube (○) array electrodes

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Figure 4

Photocurrent-voltage (I-V) curve for DSCs with TiCl4-treated TiO2 nanotube array electrodes (inset=SEM images of TiCl4-treated TiO2 nanotube arrays grown on the FTO substrate)

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Figure 5

Electron transit times τD and electron lifetime τn for DSCs with (a) ZnO nanorod and (b) TiO2 nanotube array electrodes at different light intensities (τD=◼, τn=●). Transit time and lifetime for a nanoparticle electrode (τD=◻, τn=○) are shown in comparison. The lines were calculated by linear regression, and the arrows indicate the difference between τD and τn for both electrodes.

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