本研究針對染料敏化太陽能電池(Dye-Sensitized Solar Cells, DSCs)設計合成兩個新型含3,4-乙烯二氧噻吩輔助配位基(Hexylthio-ethylene-dioxythiophene-bipyridine (HT-EDOT-BP；Ligand-20))之鋨、釕金屬錯合物(代號分別為CYC-33O與CYC-33R)，並同步探討比較兩新型光敏化劑與Os-3和Black dye的物理性質以及敏化之電池元件的光伏參數差異，藉此剖析3,4-乙烯二氧噻吩輔助配位基以及不同金屬中心對於錯合物染料特性與其元件效能之關連性。由上述四個染料之交叉比對可得知3,4-乙烯二氧噻吩可有效延長錯合物上配位基的共軛長度與增加其推電子能力，如此一來不僅可有效降低錯合物的MLCT (Metal-to-Ligand Charge Transfer)躍遷能量，也可同時提高此吸收峰的莫爾吸收係數，使兩新型染料的最低能量吸收波長與吸收系數皆優於比對參考品Os-3和Black dye的吸光性質。在AM 1.5G模擬太陽光源照射下，初步結果顯示以CYC-33O和CYC-33R敏化之電池元件的光電轉換效率最高分別為2.29 %以及5.06 % (相同條件下Os-3和Black dye則各別為0.16 %與6.62 %)，其中CYC-33O效率高於Os-3，主要可歸功於CYC-33O的輔助配位基HT-EDOT-BP有較好的共軛性與推電子能力，以及其中心鋨金屬的作用，更特別的是CYC-33O敏化之元件的IPCE響應波長範圍可有效涵蓋可見光範圍並拓展至近1100 nm，此寬廣的響應範圍不僅為本研究中比較的四個染料之最，也比大部份應用於染料敏化太陽能電池之鋨與釕金屬錯合物、紫質及有機小分子染料表現更加優異。;Two novel metal complexes, CYC-33O and CYC-33R, both incorporates the hexylthio-ethylene-dioxythiophene-bipyridine (HT-EDOT-BP; Ligand-20) and differs from each other in the metal center (Osimum versus Ruthenium) were synthesized and characterized. In addition to comparing their physical properties with Os-3 and black dye, the application of four dyes in dye-sensitized solar cells (DSCs) was also explored to scrutinize the effects of highly conjugated HT-EDOT-BP ancillary ligand and the Osimum center. It was found the MLCT (Metal-to-Ligand Charge Transfer) transition can be red-shifted and the corresponding molecular absorption coefficient can be enhanced simultaneously once the conjugation length and electron-donating ability of ancillary ligand is reinforced by the hexylthio-ethylene-dioxythiophene units. Under an illumination of AM 1.5G simulated sunlight, the best DSC sample based on CYC-33O and CYC-33R reached respectively 2.29 % and 5.06 % whereas 0.16 % and 6.62 % was obtained for the Os-3 and the Black dye sensitized device. Among four dyes, the IPCE spectra for cells based on CYC-33O cover entirely the visible light region and extend remarkably up to approximate 1100 nm. Such the widest range of spectral response can be attributed to the highly conjugated ancillary ligand in combination with the osmium metal center, and superior to most of the published ruthenium, porphyrin and metal-free organic sensitizers.
