Issue 55, 2015

Facile synthesis of Au@TiO2 nanocomposite and its application as a photoanode in dye-sensitized solar cells

Abstract

In the present investigation, gold-decorated TiO2 (Au@TiO2) plasmonic nanocomposite materials were successfully prepared through a simple one-step chemical reduction method without using any stabilizer or surfactant. These materials were then used as efficient photoanodes in dye-sensitized solar cells (DSSC). The prepared nanocomposite materials were characterized by transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM), energy dispersive X-ray (EDX) mapping, X-ray diffraction (XRD), photoluminescence (PL) and Raman analyses. The DSSC assembled with the Au@TiO2-modified photoanode demonstrated an enhanced solar-to-electrical energy conversion efficiency of 5.61%, which was higher than the unmodified TiO2 photoanode (2.55%) under full sunlight illumination (100 mW cm−2, AM 1.5 G). This enhanced efficiency is mainly attributed to the plasmonic effect, reduction in the band gap energy, improved interfacial charge transfer, and retarded charge recombination process. The influence of the Au content on the overall efficiency was also investigated, and the optimum Au content with TiO2 was found to be 2.5 wt%. The significant improvement in the solar energy conversion efficiency with the Au@TiO2-plasmonic nanocomposite showed its potential as a photoanode for high-efficiency DSSC.

Graphical abstract: Facile synthesis of Au@TiO2 nanocomposite and its application as a photoanode in dye-sensitized solar cells

Supplementary files

Article information

Article type
Paper
Submitted
08 Apr 2015
Accepted
12 May 2015
First published
18 May 2015

RSC Adv., 2015,5, 44398-44407

Facile synthesis of Au@TiO2 nanocomposite and its application as a photoanode in dye-sensitized solar cells

S. P. Lim, A. Pandikumar, N. M. Huang and H. N. Lim, RSC Adv., 2015, 5, 44398 DOI: 10.1039/C5RA06220A

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