在染料敏化太陽能電池(Dye-sensitized solar cells，DSCs)中，染料分子為影響元件效能與穩定性的關鍵組成，由先前的文獻報導得知在釕錯合物配位基引入共軛單元有利提高染料吸光能力，亦有能增加組裝成元件時的短路電流密度(Jsc)與光電轉換效率(η (%))；本研究我們設計合成了兩個新型釕錯合物(代號CYC-21及CYC-35)，兩者的輔助配位基(Ancillary ligand)均使用雙吡啶(Bipyridine)連接3,4-Ethylenedioxythiophene (EDOT)共軛單元，而主要差異是在固著配位基(Anchoring ligand)分別引入噻吩(Thiophene)及噻唑(Thiazole)，以剖析兩共軛雜環對於釕錯合物之光物理、電化學性質，以及由其所敏化之電池元件性能的影響。CYC-21與CYC-35的低能量Metal-to-ligand charge transfer (MLCT)吸收峰波長(λ_max)相較於N719 (521 nm)皆紅位移超過40 nm，其吸收係數亦明顯高於N719的12800 M-1 cm-1 (分別為24800 M-1 cm-1與30200 M-1 cm-1 )。搭配碘電解質的元件之IPCE結果顯示CYC-21 和CYC-35染料敏化之元件在波長700 ~ 800 nm的轉換效能確實均優於N719的電池；在AM 1.5G模擬太陽光照射條件下，由不同電解液條件的交互比較，發現CYC-35在搭配使用無添加TBP之電解液時，元件可有較高的Jsc值(17.64 mA cm-2)與光電轉換效率(5.56%)；搭配含有0.1 M NBB的電解液時，CYC-21及CYC-35所敏化之元件光電轉換效率分別為7.34%及5.84% (相同條件下N719元件為6.35%)。;In the dye-sensitized solar cells (DSCs), dye molecules are the key components affecting efficiency and stability of the devices. It has been reported that incorporating conjugated units into the ligands of ruthenium (Ru) complexes not only can enhance the light-harvesting capability but also may increase short-circuit current density (Jsc) and overall efficiency (η (%)) of the corresponding devices. In this research, we designed and synthesized two new Ru complexes, coded CYC-21 and CYC-35, respectively containing 3,4-ethylenedioxythiophene (EDOT) in the bipyridyl-based ancillary ligand. The difference between two dyes is bearing additionally the conjugated heterocycles (thiophene or thiazole) in anchoring ligand to scrutinize their effects on physical and electrochemical properties of the Ru photosensitizers and the performance of devices. CYC-21 and CYC-35 in DMF show the lower energetic metal-to-ligand charge transfer (MLCT) transition red-shifts over 40 nm, compared to that of N719 (521 nm). Moreover, the corresponding molar absorption coefficient of CYC-21 and CYC-35 (24800 M-1 cm-1 and 30200 M-1 cm-1, respectively) is significantly higher than that of N719 (12800 M-1 cm-1). The preliminary IPCE results exhibit the devices sensitized with CYC-21 and CYC-35 in conjunction with an iodide-based electrolyte can convert more red-light photons into electricity than that of N719. Besides, it is found from the various electrolytes that the absence of TBP benefits the improvement of Jsc (17.64 mA cm-2) and efficiency (5.56%) for CYC-35 sensitized cell. The devices based on CYC-21 and CYC-35 under the illumination of AM 1.5G simulated sunlight reach efficiency of 7.34% and 5.84%, respectively when NBB concentration in the electrolyte is 0.1 M. Under the same conditions, the conversion efficiency of N719-sensitized cell is 6.35%.
