Studies of Low-Temperature-Processed Dye Sensitized Solar Cells

We used water-based solutions of commercially available gels (Ti-Nanoxide T20-LALT and Ti-Nanoxide D20-LALT) to prepare a porous photoelectrodes for the fabrication of low-temperature-processed dye-sensitized solar cells (DSSC). By varying the thickness and light-trapping structure of the titanium oxide electrodes, the tandem-like double-dye-layer structure and the composition of the electrolytes, we studied their influences on DSSC performances, by analyzing SEM, surface profiling, current-voltage characteristics and spectrum response. In the single-layer photoelectrode structure, the light-to-electric-energy conversion efficiency of solar cells based on T20-LALT is up to 5.8% at 1 sun illumination (AM1.5, 100 mW/cm2). In the double-layer photoeletrode structure, the light-to-electric-energy conversion efficiency of solar cells based on T20-LALT and D20-LALT is up to 6.2% at 1 sun illumination (AM1.5, 100 mW/cm2). In the triple-layer photoeletrode structure, the light-to-electric-energy conversion efficiency of solar cells based on T20-LALT and D20-LALT is up to 6.8% (Voc= 0.67 V, Jsc =15.2 mA/cm2, FF=0.66) at 1 sun illumination (AM1.5, 100 mW/cm2) .