Preparation of Transparent Dispersions with Monodispersed Ag Nanoparticles for TiO2 Photoelectrode Materials with Excellent Photovoltaic Performance

Abstract

Here, we demonstrate that the introduction of the monodispersed nanoparticles into photoelectrode materials can obviously improve the photovoltaic performance of dye-sensitized solar cells (DSSCs). The highly transparent dispersions of TiO and Ag nanoparticles with the 2 excellent stability were synthesized respectively. As seed crystals, monodispersed TiO nanoparticles with the diameter of about 5 nm have unique 2 advantages in regulating the growth of multi-branched TiO nanowire arrays (T-MB-TiO ), which have large specific area. Ag nanoparticles 2 2 monodispersed in n-hexane with a small particle size (about 8 nm of average diameter) were incorporated into above-mentioned T-MB-TiO to 2 fabricate the T-MB-TiO /Ag composite photoanode, which combines the advantages of T-MB-TiO with the direct electron transport channels and 2 2 Ag nanoparticles with the localized surface plasmon resonance effect. Therefore, the DSSCs with the composite photoanode achieved excellent 2 photoelectric performance, as high as the short-circuit current density (J ) of 24 mA/cm and the photoelectric conversion efficiency (PCE) of sc 10%. Compared with the cell assembled by the photoanode of pure TiO nanowire arrays grown on the FTO glass directly, J and PCE of the 2 sc cell with T-MB-TiO /Ag composite photoanode has been increased by 48% and 28% respectively, which has a great application potential in the 2 fields of solar cells and photocatalysis.