Efficient dye-sensitized solar cells based on carbon-doped TiO2 hollow spheres and nanoparticles

Y. Tabari-Saadi, M. R. Mohammadi (Lead / Corresponding author)

    Research output: Contribution to journalArticlepeer-review

    10 Citations (Scopus)

    Abstract

    Different structures of TiO2 photoelectrodes are fabricated with various arrangement modes of the layers. TiO2 nanoparticles, synthesized by stabilizing agent free non-hydrolytic sol–gel method, are employed as the under layer, whereas carbon-doped TiO2 hollow spheres, prepared by hydrothermally grown carbon template, are used as the scattering layer of solar cells. The nanoparticles (22 nm) have anatase structure, while 300–700 nm hollow spheres show mixtures of anatase and rutile phases. X-ray photoelectron spectroscopy confirms that carbon is doped into TiO2 hollow spheres, resulting in a decrease in band gap energy in the range 2.96–3.13 eV compared with 3.04 eV band gap energy for the nanoparticles. The diffuse reflectance spectroscopy measurements show that the hollow spheres exhibit higher scattering property than the nanoparticles. The single layer solar cell made of nanoparticles and carbon-doped TiO2 hollow spheres shows the highest efficiency of 7.21 and 7.02 %, respectively. Further enhancement of photovoltaic performance is obtained by light scattering mechanism aided by fabrication of double layer solar cells due to higher incident photon-to-current conversion and less recombination. The double layer solar cell made of nanoparticles as the under layer and hollow spheres (containing 86 % anatase–14 % rutile) as the scattering layer shows the highest efficiency of 8.55 %.

    Original languageEnglish
    Pages (from-to)8863-8876
    Number of pages14
    JournalJournal of Materials Science: Materials in Electronics
    Volume26
    Issue number11
    Early online date4 Aug 2015
    DOIs
    Publication statusPublished - Nov 2015

    Keywords

    • TiO2
    • Rutile
    • TiO2 Nanoparticles
    • Hollow Sphere
    • Power conversion Efficiency

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