Dye-sensitized solar cells with high efficiency: from interface control to solidification

Yuhei Ogomi; Shohei Sakaguchi; Shuzi Hayase

doi:10.1117/12.732354

27 September 2007 Dye-sensitized solar cells with high efficiency: from interface control to solidification

Yuhei Ogomi, Shohei Sakaguchi, Shuzi Hayase

Proceedings Volume 6656, Organic Photovoltaics VIII; 665606 (2007) https://doi.org/10.1117/12.732354
Event: Photonic Devices + Applications, 2007, San Diego, California, United States

Abstract

Some items to increase photovoltaic performances of dye sensitized solar cells (DSC) are reported. Focus is put on the fabrication of the electron collection path and ionic path. In order to increase the surface coverage of TiO₂ nano-particles with dye molecules, the dye adsorption on TiO₂ layers was carried out under a pressurized CO₂ atmosphere (CO₂ process). The CO₂ process promoted the dye adsorption and shortened the dye adsorption time to 1/10 - 1/100. In addition, solar cells prepared by the CO₂ process had higher Voc and Jsc than those prepared by the conventional dipping process. The increase in the photovoltaic performance was explained by the large electron diffusion coefficient in TiO₂ layers and by longer electron life time in TiO₂ layers. Thermally stimulated current measurement (TSC) implied that the surface electron trap on the TiO₂ nano-particle was passivated by the sufficient dye adsorptions on the TiO₂ surfaces. In addition, it was found that the dye aggregation was prevented by the CO₂ process, which increased the photovoltaic performances. Hybrid dye sensitized solar cells having two-dye-layer-structures were fabricated by the CO₂ process for the first time in order to absorb the light having wide range of wavelength. In addition, three-dimensional W electrodes were fabricated on the thick TiO₂ layer in order to collect electrons in the TiO₂ layer effectively. Solid type DSCs are reported. High performance quasi-solid DSCs were fabricated by preparing ionic paths in the quasi-solid electrolyte layers. The ionic path was fabricated by the surface modification of the straight nano-pore walls in a porous Al₂O₃ membrane, where, I^-/I₃ ^- ion species were concentrated and were expected to diffuse by Grötthuss mechanism.

Citation Download Citation

Yuhei Ogomi, Shohei Sakaguchi, and Shuzi Hayase "Dye-sensitized solar cells with high efficiency: from interface control to solidification", Proc. SPIE 6656, Organic Photovoltaics VIII, 665606 (27 September 2007); https://doi.org/10.1117/12.732354

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KEYWORDS

Dye sensitized solar cells

Electrodes

Photovoltaics

Diffusion

Solids

Aluminum

Carbon monoxide

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