| 摘要: | 染料敏化太陽能電池(Dye-sensitized solar cells (DSCs))具有製程簡易等優點，在此太陽光電技術中，吸附於多孔隙二氧化鈦(TiO2)薄膜上的染料分子是影響其元件光電轉換效率的關鍵，為使元件展現最佳性能，須依據染料分子的吸光與吸附性質，調整二氧化鈦薄膜厚度，並須嘗試添加共吸附劑以減少染料在薄膜上的聚集，以提高元件的短路電流密度(Short-circuit current density (Jsc))，若能同時抑制電荷再結合，也可一併增加元件的開路電壓(Open-circuit voltage (Voc))與填充因子(Fill factor (FF))。本研究是針對本實驗室所開發的新型染料(包含釕錯合物CYC-21、CYC-53、CYC-55，與鋨錯合物CYC-45I、CYC-45Cl、CYC-33O )，進行元件條件的優化以提高其光電轉換效率，其調整項目除了使用不同的共吸附劑(包含Chenodeoxycholic acid (CDCA)與2-(4-Butoxyphenyl)-N-hydroxyacetamide (BPHA))與染料分子進行共吸附，以有效減少染料分子的聚集現象並填補裸露的TiO2表面外，也另外改變I-/I3-氧化還原對電解液的組成(包含不同濃度的LiI、4-tert-Butylpyridine (tBP)、Guanidinium thiocyanate (GuSCN)、Lithium carbonate (Li2CO3)等)、調整染料分子的吸附溫度和時間、以及嘗試使用不同有機小分子進行染料吸附之二氧化鈦表面的後處理等。在標準測試條件下(AM 1.5G，25 °C)，CYC-21與CYC-45I染料敏化元件經上述優化後的最高光電轉換效率分別為9.10%和6.17%，值得強調的是，本研究證實CYC-45I染料敏化元件性能可優於本實驗室先前已發表之CYC-33O染料(敏化元件效率為5.7%)，此部分結果可對高效能鋨錯合物染料的元件優化提供明確方向。;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. |
