Enhanced electron collection efficiency of nanostructured dye-sensitized solar cells by incorporating TiO2 cubes

Najme Sarvari, Mohammad Reza Mohammadi (Lead / Corresponding author)

    Research output: Contribution to journalArticlepeer-review

    5 Citations (Scopus)

    Abstract

    Herein, enhancement of dye-sensitized solar cell (DSC) performance is reported by combining the merits of the dye loading of TiO2 nanoparticles and light scattering, straight carrier transport path, and efficient electron collection efficiency of TiO2 cubes. We fabricate DSC devices with various arrangement styles and compositions of the electrodes in the forms of monolayer and double layer films. For this purpose, the solvothermal synthesized TiO2 cubic particles (100-600 nm) are employed as the scattering layer, whereas TiO2 nanoparticles (15-30 nm) synthesized via a combination of solvothermal and sol-gel routes are used as the active layer of devices. We improve the photovoltaic characteristics of DSCs by two mechanisms. First, the light harvesting of DSC devices made of nanoparticles is improved by controlling the thickness of monolayer films, reaching the highest efficiency of 7.0%. Second, the light scattering and electron collection efficiency are enhanced by controlling the composition of double layer films composed of mixtures of TiO2 nanoparticles and cubes, obtaining the maximum efficiency of 8.21%. The enhancements are attributed to balance between charge transfer resistance and charge recombination of photo-generated electrons as well as dye loading and light scattering.

    Original languageEnglish
    Pages (from-to)293-306
    Number of pages14
    JournalJournal of the American Ceramic Society
    Volume101
    Issue number1
    Early online date21 Aug 2017
    DOIs
    Publication statusPublished - Jan 2018

    Keywords

    • double layer solar cells
    • electron collection efficiency
    • light harvesting
    • TiO cubes
    • TiO nanoparticles

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