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Issue 20, 2017
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High efficiency solid-state dye-sensitized solar cells using a cobalt(II/III) redox mediator

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Abstract

Improvement in the mass transport of the considerably large sized cobalt(II/III) complexes, particularly in a high viscosity electrolyte, is crucial for solid-state dye-sensitized solar cells (SS-DSCs) to reach a reliable high efficiency for practical applications. In this study, titania nanorod aggregates (TNA) with a large specific surface area and well-developed crystalline network were utilized as photoanode building blocks for application in a cobalt(II/III) tris(2′2-bipyridine) complexes-based solid-state electrolyte. An initial efficiency excess of 7.1% and a long term stable efficiency of approximately 8.0% were achieved under full sun illumination by the freshly assembled and aged TNA SS-DSCs, respectively. This represents dramatic enhancements of nearly 35% and 100% against the SS-DSCs prepared from two standard TiO2 nanoparticle samples – CCIC (approx. 5.9%) and Degussa P25 (approx. 4.0%), correspondingly. The TNA is characterised by a combination of mesopores within each aggregate and macro inter-aggregate voids, a high specific surface area and great light scattering ability; such features make the aggregates superior photoanode building blocks for their application in bulky cobalt redox mediator based SS-DSCs systems.

Graphical abstract: High efficiency solid-state dye-sensitized solar cells using a cobalt(ii/iii) redox mediator

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Publication details

The article was received on 08 Mar 2017, accepted on 18 Apr 2017 and first published on 19 Apr 2017


Article type: Paper
DOI: 10.1039/C7TC00994A
Citation: J. Mater. Chem. C, 2017,5, 4875-4883
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    High efficiency solid-state dye-sensitized solar cells using a cobalt(II/III) redox mediator

    X. L. Zhang, W. Huang, A. Gu, W. Xiang, F. Huang, Z. X. Guo, Y. Cheng and L. Spiccia, J. Mater. Chem. C, 2017, 5, 4875
    DOI: 10.1039/C7TC00994A

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