染料敏化太陽能電池 (DSCs)中的染料為有機分子時，相較於一般Grätzel太陽能電池常用之金屬錯合物染料，有著高吸收係數及無需使用貴重金屬元素的好處。本研究以雙噻吩環戊烷 (CPDT，cyclopentadithiophene)出發，將CPDT單體策略性接上酯基，再利用Stille coupling或氧化聚合的方式分別合成共聚物F-P1 ester、F-P2 ester及高分子F-P3 ester，隨後將酯基酸化成羧酸以便和二氧化鈦奈米粒子行自組裝作用。此外我們也會將CPDT衍生物策略性的引入有機小分子染料的結構中，將CPDT作為染料電子acceptor與作電子donor之Triphenylamine coupling合成出F-O3，同時使用其他較高能隙結構的Fluorene及Bithiophene取代CPDT，合成出染料F-O1及F-O2，並探討不同結構之染料組成元件後的效能差異，以做為設計DSCs之新結構有機光敏化染料的參考。 Organic dye, compared to the Ruthenium-based photo-sensitizer in the Grätzel cell, has the advantages of high absorbance coefficient and without using expensive metal. We synthesize a series of polymer and organic dyes containing a low band gap moiety CPDT. The polymer dyes F-P1、F-P2 and F-P3 were prepared by Stille coupling or oxidative polymerization and identified with 1H-NMR. CPDT was also used as acceptor in the preparation of the “donor-acceptor” typed metal free dyes, such as F-O3. Furthermore, other conjugated moieties such as fluorene and bithiophene were also used instead of CPDT to synthesize small molecule F-O1 and F-O2 dyes for comparison. The polymers and small molecular organic dyes were used to assemble the DSC cells and the performance of the cells was measured. The properties related cell performance was interpreted. The strategy for high efficiency organic dye was also proposed.