在本研究中首先以TiCl4在不同的反應條件下對二氧化鈦工作電極進行前、後處理的修飾並成功提升元件的開環電壓(Voc)與短路電流(JSC)。進一步針對染料溶液濃度、電極吸附染料溫度等進行探討。另一方面，電解液在元件中扮演還原氧化態染料的角色亦是決定理論Voc的因素之一，所以對於電解液的改良是相當重要的。對DSSC最常用的I-/I3-電解質進行配方組成的最佳化及改善具有高理論Voc值的Co2+/Co3+電解質因質傳造成的暗電流問題。我們使用PMMA均一次微米球添加在二氧化鈦漿料中讓工作電極使其具有不同的電極孔洞形態，探討不同孔隙度電極對於搭配Co2+/Co3+電解質的元件表現。本研究搭配中央大學化學系吳春桂老師實驗室開發的SJW-B18及CYC-B11染料，配合碘電解液(0.6 M BMII/0.1 M LiI/0.05 M I2/0.1 M GuNCS/0.5 M TBP)的小面積元件效率可達9.80%；搭配鈷電解液 (0.2 M Co(bpy)3(PF6)2/ 0.02 M Co(bpy)3(PF6)3/0.1 M LiClO4/0.7 M TBP)，電池的Voc最高達0.832 V，效率可達5.5%。最後將上述在小電池元件所探討的最佳條件應用於5 cm x 5 cm DSSC次模組電池上。藉由電極圖案設計與銀線收集線的搭配實驗，所製備之5 cm x 5 cm DSSC次模組電池搭配N719下輸出功率從86.2 mW提升至93.7 mW，搭配CYC-B11下光電轉換效率可達9.79%及開口面積效率達5.83%。 In this study, we first modified TiO2 working electrode by pre-treating and post-treating with different TiCl4 reaction conditions to enhance the open-circuit voltage (Voc) and short-circuit current (Jsc). Then, the effect of dye solution concentration and the dye adsorption temperature were also investigated. The other hand, the improvement of the electrolyte is very important because electrolyte in the cell play the role of the dye redox and is the factor of theoretical Voc values. We optimized electrolyte composition in I-/I3- electrolyte system which is commonly used in dye-sensitized solar cell (DSSC) and improved the dark current problem due to the mass transfer in Co2+/Co3+ electrolyte system which has higher theoretical Voc values. The cell performance in Co2+/Co3+ electrolyte system was discussed by changing the electrode porosity with adding PMMA submicrospheres to the TiO2 paste. The results showed that by using the SJW-B18 and CYC-B11 developed by Prof. Chun-Guey Wu's lab in National Central University Department of Chemistry, the efficiency of small area cell could reach 9.80% in the iodine electrolyte system (0.6 M BMII/0.1 M LiI/0.05 M I2/0.1 M GuNCS/0.5 M TBP). The Voc and efficiency could reach to 0.832 V and 5.5% in the cobalt electrolyte (0.2 M Co(bpy)3(PF6)2/0.02 M Co(bpy)3(PF6)3/0.1 M LiClO4/0.7 M TBP). Finally, applying the above optimal conditions of small area cell to 5 cm × 5 cm sub-module device, the output power enhanced from 86.2 mW to 93.7 mW by using N719, and the active area efficiency and aperture area efficiency could reach 9.79% and 5.83%, respectively, by using CYC-B11.
