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Photoelectric conversion; solar cells and arrays

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  • Physics [2]
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  • 2011 [2]

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Enhanced efficiency in dye-sensitised solar cells using a TiO2-based sandwiched film as photoanode
Author(s): Cuiping Kang, Zhenxing Zhang, Yongzhe Zhang, Yongmin He, Yizhu Xie, Erqing Xie
Source: Micro & Nano Letters, Volume 6, Issue 8, 2011 , p. 579 - 581
Type: Article
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A multi-layered film with a TiO2-based nanotubes/nanoparticles/nanotubes sandwich structure has been developed to increase light-harvesting efficiency by enhancing light scattering. Compared to a double-layered film of nanotubes/nanoparticles, the sandwiched film exhibited greatly improved light-absorption properties. An obviously improved total energy-conversion efficiency of 6.11% was obtained in the sandwiched film, which is 27.3, 46.1 and 213% higher than those of the double-layered film, nanoparticle film and nanotube film, respectively. A possible mechanism for the enhancement of light harvesting in the sandwiched film is proposed, whereby the observed enhancement is owing to effective scattering by the bottom layer and reflection of escaped light by the top layer.

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Spindle-like TiO2 with high crystallinity and its application in dye sensitised solar cell
Author(s): Jiangli Yang, Zhiyong Gao, Li Tian, Pengfei Ma, Dapeng Wu, Lin Yang
Source: Micro & Nano Letters, Volume 6, Issue 8, 2011 , p. 737 - 740
Type: Article
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TiO2 spindles with high crystallinity were synthesised by a two-step solvothermal reaction with the aid of diethylamine. Compared with Degussa P25, the dye sensitised solar cell (DSSC) based on a TiO2 spindles photoanode demonstrated superior characteristics including higher affinity to N719 dye, higher light scattering effect than P25, better conductance and longer recombination lifetime. Photovoltaic measurement indicated that the TiO2 spindles-based DSSC possesses higher short-circuit current density (Jsc) and open-circuit voltage (Voc), hence, a 29% higher overall photovoltaic performance (η) than that of P25 was achieved.

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