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Thermally Grown ZnO Nanosheets for High Efficiency Dye-Sensitized Solar Cells

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Abstract:

High efficiency dye-sensitized solar cells (DSSCs) were fabricated using ZnO nanosheet electrodes. ZnO nanosheets were synthesized on top of fluorine-doped tin oxide (FTO) glass using Zn(OAc)2 as a precursor in the gold catalyzed chemical vapor deposition (CVD) method at a temperature of 800–900 °C. The synthesized materials were characterized by X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), and Raman and photoluminescence (PL) spectroscopy. Typical DSSCs with ZnO nanosheets achieved moderately good conversion efficiency of ∼2.12% with short-circuit current density JSC = 3.56 mA/cm2, open-circuit voltage VOC = 0.831 V, and fill factor FF = 71%. The high JSC and are attributed to high dye absorption through high surface ZnO nanosheets, which increased the light harvesting. The lower recombination rate was also observed in the ZnO nanosheet electrodes, resulting in high values of VOC and FF in the DSSCs.

Keywords: CHEMICAL VAPOR DEPOSITION; DYE-SENSITIZED SOLAR CELLS; LIGHT HARVESTING; ZNO NANOSHEETS

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2010.2304

Publication date: May 1, 2010

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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