Promotional effect of silver nanoparticles on the performance of N-doped TiO2 photoanode-based dye-sensitized solar cells

摘要

We report the first successful application of an N-TiO _(2) –Ag nanocomposite as an efficient photoanode for highly efficient dye-sensitized solar cells (DSSC). The N-TiO _(2) –Ag nanocomposites with different Ag contents were prepared using a simple chemical reduction method and characterized using various suitable techniques. The DSSC assembled with the N-TiO _(2) –Ag-modified photoanode demonstrated an enhanced solar-to-electrical energy conversion efficiency of 8.15% compared to the photoanode of a DSSC composed of unmodified TiO _(2) (2.19%) under full sunlight illumination (100 mW cm ~(?2) , AM 1.5 G). This superior DSSC performance was due to the reduced band gap energy and retarded charge recombination that resulted from the introduction of plasmonic Ag nanoparticles on the surface of N-TiO _(2) . The influence of the Ag content on the overall efficiency was also investigated, and the optimum Ag content for N-TiO _(2) was found to be 10 wt%. The enhanced solar energy conversion efficiency demonstrated by the N-TiO _(2) –Ag nanocomposite makes it a promising alternative to conventional photoanode-based DSSCs.