Investigation of plasmonic gold-silica core-shell nanoparticle stability in dye-sensitized solar cell applications

Björn Törngren, Kenta Akitsu, Anne Ylinen, Simon Sandén, Hua Jiang, Janne Ruokolainen, Makoto Komatsu, Tomofumi Hamamura, Jotaro Nakazaki, Takaya Kubo, Hiroshi Segawa, Ronald Österbacka, Jan-Henrik Smått

    Research output: Contribution to journalArticleScientificpeer-review

    25 Citations (Scopus)

    Abstract

    Plasmonic core-shell Au@SiO2 nanoparticles have previously been shown to enhance the performance of dye-sensitized solar cells (DSSCs). A thin silica coating can provide a better stability during thermal processing and chemical stability to survive the corrosive electrolyte used in DSSCs. However, the thickness and completeness of the silica shell has proven crucial for the performance of the plasmonic particles and is largely controlled by the linking chemistry between the gold core and silica shell. We have evaluated four different silica coating procedures of ∼15 nm gold nanoparticles for usage in DSSCs. The chemical stability of these core-shell nanoparticles was assessed by dispersing the particles in iodide/triiodide electrolyte solution and the thermal stability by heating the particles up to 500°C. In order to maintain stable gold cores a complete silica coating was required, which was best obtained by using a mercaptosilane as a linker. In situ TEM characterization indicated that the heating process only had minor effects on the core-shell particles. The final step was to evaluate how the stable Au@SiO2 nanoparticles were influencing a real DSSC device when mixed into the TiO2 photoanode. The plasmon-incorporated DSSCs showed a ∼10% increase in efficiency compared to devices without core-shell nanoparticles.
    Original languageUndefined/Unknown
    Pages (from-to)54–61
    JournalJournal of Colloid and Interface Science
    Volume427
    DOIs
    Publication statusPublished - 2014
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Plasmon
    • Nanoparticles
    • Hybrid
    • solar cells

    Cite this