本研究主要針對染料敏化太陽能電池(Dye-sensitized solar cells (DSCs))設計合成出兩個新型釕金屬錯合物染料(代號CYC-37與CYC-39)，兩者的設計概念源自於Black dye (N749)，我們在其三吡啶(Terpyridine)固著配位基減少一個羧酸，並藉由四號位延伸配位基之共軛長度以拓展染料的吸光波長範圍和提高吸收係數，同時，兩染料共軛雜環(Conjugated heterocycle)末端均接上正己基以期能提高染料分子吸附之穩定性。在共軛雜環的選擇上，CYC-37是使用有推電子能力的3,4-乙烯二氧噻吩(3,4-ethylene-dioxythiophene (EDOT))單元，而CYC-39則史無前例地引入具拉電子效應的噻唑(Thiazole)，以詳細探討比較推拉電子效應對於染料分子性質與其敏化之電池元件的影響；在DMF溶劑下，CYC-37與CYC-39的最大吸收波長分別為615 nm與616 nm，相較於Black dye不僅紅移了10 nm以上，兩新穎染料的整體吸光強度亦高於Black dye，此外，CYC-39搭配碘電解液的電池元件初步測試效能可達9.0% (優於Black dye元件(8.8%))，此結果顯示由三吡啶固著配位基四號位連接具拉電子效果之共軛雜環，確實有機會提高釕金屬錯合物敏化太陽能電池的光電轉換效率。;In this research, we designed and synthesized two new ruthenium complexes, coded CYC-37 and CYC-39, respectively for the application in dye-sensitized solar cells (DSCs). The concept of molecular engineering is originated from the Black dye (N749). We replaced one carboxyl group at the fourth position of terpyridine ligand with a conjugated moiety to expand the light absorption range and to enhance the molar absorption coefficient. A hexyl substituent was attached at the terminal of the anchoring ligands to improve adsorption stability of dye molecules. With the attempts to investigate the electron donating and withdrawing effects on the properties of dye molecules and the device performance, the conjugated heterocycle used in CYC-37 and CYC-39 is 3,4-ethylene-dioxythiophene (EDOT) and thiazole, respectively. The maximum absorption wavelength (λmax) of CYC-37 and CYC-39 in DMF is 615 nm and 616 nm, respectively. Compared to the Black dye, CYC-37 and CYC-39 both show superior light harvesting capability. The preliminary test shows that the device sensitized with CYC-39 in conjunction with an iodide-based electrolyte has the good efficiency of 9.0%, which surpasses that of Black dye (8.8%) measured under the same conditions. These results exhibit that the terpyridine ligand bearing unprecedentedly the electron withdrawing heterocycle, thiazole, at the fourth binding position is promising to boost the power conversion efficiency of ruthenium complex sensitized solar cells.
