本論文中合成了一系列具有釕金屬以及環戊二烯作為多電子系統的有機金屬配位基，再以此配位基與釕金屬形成配位化合物。根據先前文獻指出具有多電子系統的釕金屬配位化合物其具有消光係數較大以及吸收光譜較紅位移的特點，而先前大多文獻在此方面多半以具有芳香環的胺類為多電子系統，但是具有胺類配位基的染料在氧化時容易產生自由基，使得染料趨於不穩定而產生變化，因此，我們利用具有穩定氧化還原的釕金屬化合物作為多電子的配位基，以改善有機配位基的缺點並承襲它在光譜上的優點，希望可以在染料敏化太陽能電池的應用上有更好的表現。 經元件測試結果，具釕金屬多電子系統之配位基之染料效率如下：Jsc = 3.08 mA/cm2、Voc = 0.53 V、FF = 0.66、??= 1.06%，效果明顯不如預期，這是因為LUMO能階與二氧化鈦導帶之能階差小於0.3 eV，因而電子注入二氧化鈦驅動式不足，使得光電流降低；其HOMO能階與電解質之氧化位能階差小於0.3 eV，因此二氧化鈦上的電子易與電解質競爭再生染料，使得光電壓降低。We have synthesized a ruthenium(II)-polypyridyl photosensitizer, which contains an electron-rich cyclopentadienyl ruthenium (II) moiety in the polypyridyl ligand. The incorporation of electron-rich moiety in Ru(II)-based sensitizers has shown improvements in their extinction coefficients and bathochromic shift of the absorption spectral coverage. The photophysical properties and cell performance were studied in detail. The DSSC performance did not achieve the original expectation with efficiency 1.06% (Jsc = 3.08 mA/cm2, Voc = 0.53 V, FF = 0.66). The low photocurrent density was ascribed to the exist of low-lying LUMO level in CT-1, which lacks of sufficient driving force for charge injection. On the other hand, the exist of high-lying HOMO level resulted in rapid charge recombination that suppresses the open-circuit voltage to reach the expected value.
