Improved efficiency of dye-sensitized solar cells aided by corn-like TiO2 nanowires as the light scattering layer

A. M. Bakhshayesh, M. R. Mohammadi (Lead / Corresponding author), H. Dadar, D. J. Fray

    Research output: Contribution to journalArticlepeer-review

    49 Citations (Scopus)

    Abstract

    We present a new TiO2 morphology, featuring highly crystalline anatase structure, synthesized by a two consecutive hydrothermal operation for the manufacture of dye-sensitized solar cells (DSSCs). This construct is a one-dimensional (1D) nanostructure (i.e., nanowire) with interconnected nanoparticles on the surface with a large percentage of reactive facets, so called corn-like nanowire. Such morphology is produced by a surface modification concept using surface tension stress mechanism. The double layer DSSC made of anatase-TiO2 nanoparticles as the under-layer and corn-like TiO 2 nanowires as the over-layer (as light scattering layer) shows higher conversion efficiency of 7.11% and short circuit current density of 16.54 mA/cm2 than that of containing anatase-TiO2 nanoparticles as the under-layer and regular TiO2 nanowires as the over-layer. The novel TiO2 morphology enhances photon capture of fabricated DSSC by exerting a triple function mechanism including improvement of light scattering, dye sensitization and photo-generated charge carriers. An increase of 12% in cell efficiency is achieved by employment of corn-like structure as a result of slow charge recombination. The presented strategy demonstrates the feasibility of the new concept for improvement of cell efficiency by effective light management.

    Original languageEnglish
    Pages (from-to)302-308
    Number of pages7
    JournalElectrochimica Acta
    Volume90
    Early online date24 Dec 2012
    DOIs
    Publication statusPublished - 15 Feb 2013

    Keywords

    • Anatase-titania
    • Corn-like nanowire
    • Double-layer film
    • Dye-sensitized solar cell
    • Light scattering

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