Enhancing Photocurrent Performance Based on Photoanode Thickness and Surface Plasmon Resonance Using Ag-TiO 2 Nanocomposites in Dye-Sensitized Solar Cells

This study investigated the different thicknesses of TiO photoanode films and the effect of surface plasmon resonance (SPR) of Ag-TiO nanocomposites on the current-voltage (I-V) performance of dye-sensitized solar cells (DSSC). The TiO layer was deposited using the doctor blade technique and the thickness of the TiO films was controlled by using a different number of Scotch tape layers. The silver nanoparticles (AgNP) were synthesised using a chemical reduction method and the concentration of sodium citrate as a reducing agent was varied from 4 to 12 mM to study the effect of citrate ion on the size of the nanoparticles. Ag-TiO nanopowder was prepared by adding pure anatase TiO powder into AgNP colloidal solution. The mixture was left to dry for 24 h to obtain Ag-TiO powder for paste preparation. The three-layer Scotch tape, with thickness of 14.38 µm, achieved a high efficiency of 4.14%. This results showed that three layers was the optimal thickness to improve dye loading and to reduce the charge recombination rate. As for the Ag-TiO nanocomposites, 10 mM of AgNP, with a mean diameter of 65.23 nm and high efficiency of 6.92%, proved that SPR can enhance the absorption capability of dye and improve the photon-to-electron generation.