| dc.description.abstract | Dye-sensitized solar cells (DSCs) have many advantages, such as easy fabrication. In this type of photovoltaic technology, dye molecules adsorbed onto porous titanium dioxide (TiO2) films are critical for influencing the device′s power conversion efficiency. To achieve optimal device performance, the thickness of the TiO2 film should be adjusted according to the light-harvesting and adsorption properties of the dye molecules. Co-adsorbents should be added to reduce dye aggregation on the film, aiming to increase the short-circuit current density (Jsc). Additionally, inhibiting charge recombination can enhance the open-circuit voltage (Voc) and fill factor (FF). This study focuses on optimizing the device fabrication conditions for newly developed dyes from our laboratory, including ruthenium complexes CYC-21, CYC-53, and CYC-55, and osmium complexes CYC-45I, CYC-45Cl, and CYC-33O, to enhance their performance. Adjustments include the use of different co-adsorbents such as chenodeoxycholic acid (CDCA) and 2-(4-butoxyphenyl)-N-hydroxyacetamide (BPHA), to effectively reduce dye aggregation and cover the bare TiO2 surface. Additionally, changes in the composition of the I-/I3- redox couple electrolyte (including various concentrations of LiI, 4-tert-butylpyridine (tBP), guanidinium thiocyanate (GuSCN), lithium carbonate (Li2CO3), etc.), modification of the TiO2 film thickness, adjustment of the dye molecules’ adsorption temperature and time, and exploration of different organic small molecules for post-staining surface treatment of the dye-adsorbed TiO2 were conducted. Under standard testing conditions (AM 1.5G, 25 °C), the highest power conversion efficiencies of the optimized CYC-21 and CYC-45I dye-sensitized devices were 9.10% and 6.17%, respectively. Notably, this study confirms that the performance of the CYC-45I dye-sensitized device surpasses that of the previously published CYC-33O dye (with an efficiency of 5.7%). These findings provide a clear index for the molecular design and the device optimization of high-efficiency osmium complex dyes. | en_US |