Enhanced efficiency of over 10% in dye-sensitized solar cells through C and N single- and co-doped TiO2 single-layer electrodes

H. Asgari Moghaddam, S. Jafari, M. R. Mohammadi (Lead / Corresponding author)

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    Herein, we report the impact of single- and co-doping of nanoparticle TiO2 films with carbon and nitrogen on the photovoltaic characteristics of their corresponding dye-sensitized solar cell (DSC) devices. Different DSCs with various compositions of the photoanode electrodes are fabricated to study their structural and electronic properties by X-ray diffraction (XRD), diffuse reflectance spectroscopy (DRS), field-emission scanning electron microscopy (FE-SEM), Brunauer-Emmett-Teller (BET) analysis and X-ray photoelectron spectroscopy (XPS). We find that the interstitial nitrogen atoms for single N doping have a greater impact on the band gap energy (Eg) than the substitutional (to Ti) carbon atoms for single C doping. The short circuit current and efficiency of DSCs are enhanced by C and N single- and co-doping with dominant impression of carbon doping. Furthermore, the electrochemical impedance spectroscopy (EIS) measurements reveal that the electron lifetime, charge transport and recombination resistance of DSCs are improved by C and N single- and co-doping with prominent impact of carbon doping. Therefore, we achieve the highest cell efficiency of 10.2% as a result of a balance between the band gap, surface area, and diffused reflection of the photoanode electrode.

    Original languageEnglish
    Pages (from-to)9453-9460
    Number of pages8
    JournalNew Journal of Chemistry
    Volume41
    Issue number17
    Early online date4 Aug 2017
    DOIs
    Publication statusPublished - 7 Sep 2017

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