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Issue 7, 2014
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Titania nanobundle networks as dye-sensitized solar cell photoanodes

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Quasi-one-dimensional (1D) titania nanobundles were synthesized via a hydrothermal method and used to print random network nanostructured films. These films are shown to be ideally suited for application as photoanodes in dye-sensitized solar cells (DSCs) as they have a higher porosity compared to the traditional 1D nanostructured TiO2 materials. Devices constructed using the N719 dye and iodide/triiodide as the redox mediator in the electrolyte yielded energy conversion efficiencies (η = 6.1 ± 0.2%), which were marginally lower than for devices made with the commonly used P25 titania films (η = 6.3 ± 0.1%) under one sun simulated solar radiation. Application of an electrolyte based on the [Co(bpy)3]2+/3+ redox couple and the MK2 organic sensitizer resulted in higher efficiencies (η = 7.70 ± 0.1%) than for the P25 devices (η = 6.3 ± 0.3%). Each performance parameter (short circuit current density, open circuit voltage and fill factor) was higher for the TiO2 nanobundle devices than those for the P25-based devices. The results of electrochemical impedance spectroscopy (EIS), intensity-modulated photovoltage spectroscopy (IMVS), and dye-loading measurements indicated that the better performance of TiO2 nanobundle devices with cobalt electrolytes correlates with higher porosity, relatively fast electron transport and more efficient suppression of electron recombination. A faster rate of diffusion of the cobalt complexes through the highly porous TiO2 nanobundle network is proposed to contribute to the enhanced device efficiency.

Graphical abstract: Titania nanobundle networks as dye-sensitized solar cell photoanodes

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The article was received on 22 Nov 2013, accepted on 08 Jan 2014 and first published on 16 Jan 2014

Article type: Paper
DOI: 10.1039/C3NR06157D
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Citation: Nanoscale, 2014,6, 3704-3711
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    Titania nanobundle networks as dye-sensitized solar cell photoanodes

    C. Dong, W. Xiang, F. Huang, D. Fu, W. Huang, U. Bach, Y. Cheng, X. Li and L. Spiccia, Nanoscale, 2014, 6, 3704
    DOI: 10.1039/C3NR06157D

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