Significant enhancement of power conversion efficiency of dye-sensitized solar cells by the incorporation of TiO.sub.2-Au nanocomposite in TiO.sub.2 photoanode

• Published in: Journal of materials science 2018-06, Vol.53 (11), p.8460
• Main Authors: Bhardwaj, Swati, Pal, Arnab, Chatterjee, Kuntal, Rana, Tushar H, Bhattacharya, Gourav, Roy, Susanta Sinha, Chowdhury, Papia
• Format: Article
• Language: English
• Subjects: Energy use; Photoluminescence; Solar cells; Ultraviolet-visible spectroscopy; X-ray diffraction
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-018-2156-0

In this report, the effect of incorporation of hydrothermally prepared TiO.sub.2-Au nanocomposites in the photoanode of dye-sensitized solar cells (DSSCs), prepared from commercially available TiO.sub.2 nanoparticles, has been investigated. Electrophoretic deposition technique has been utilized for nanocomposite-doped photoanode preparation. The formation of hydrothermally prepared TiO.sub.2-Au nanocomposites has been confirmed by the X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), UV-Vis spectroscopy. The HRTEM images establish that the particle size of Au nanoparticles dispersed in TiO.sub.2 matrix varies from 2 to 45 nm. TiO.sub.2-Au photoelectrode has been characterized by XRD, field emission scanning electron microscopy, Raman spectroscopy and photoluminescence spectroscopy in order to confirm the successful preparation of plasmonic photoanodes. Measurement of current-voltage characteristics of the plasmonic dye-sensitized solar cells under the solar simulator illumination (100 mW/cm.sup.2, AM 1.5) shows enormous enhancement of power conversion efficiency. The PCE of plasmonic DSSCs is 10.1%, which is 134% greater than the DSSCs with pristine TiO.sub.2 photoanode of the same thickness. Electro-impedance spectroscopy reveals that the back electron transfer from the conduction band of Au-TiO.sub.2 photoanode to either dye or electrolyte has been significantly suppressed in the DSSC with plasmonic photoelectrode.