本研究利用五種有機色素 — Mercurochrome、Eosin Y、Coumarin 343、Rose bengal及D149 — 作為色素增感太陽電池（Dye-sensitized Solar Cells, DSSCs）的增感劑，並形成四個雙成份混合系統 — Mercurochrome/Rose bengal、Mercurochrome/Coumarin 343、Mercurochrome/Eosin Y、 D149/Mercurochrome — 以分子共增感的方式探討雙成份有機色素在TiO2光電極上的吸附能力與電池在光電轉換效率上的表現。實驗結果顯示雙成份有機色素組成對效率的影響可歸納成三種類型，第一類型是效率較高的色素其吸附能力等於效率較低的色素，組成對效率的圖型應是一條斜直線；第二類型是效率較高的色素其吸附能力大於效率較低的色素，組成對效率的圖型為一上凸曲線；第三類型是效率較高的色素其吸附能力小於效率較低的色素，組成對效率的圖型為一下凹曲線。此外，在第二類型的雙成份混合系統中也發現微量的第二成份色素可以增進具有較強吸附能力且較高效率的第一成份色素的增感能力，共增感之光電轉換效率約有16～18%的提升；但此一微量成份促進效應與兩種有機色素的吸收波長範圍互補性的關係不大。根據雙成份有機色素混合系統的效率測定、入射光電轉換效率（IPCE）、暗電流（dark current）與電化學交流阻抗圖譜（EIS）等分析，本研究亦提出微量成份促進效應的可能機制－抑制漏電流機制︰微量成份的色素分子會填補於色素單分子層的缺陷位置，光電極表面由雙成份色素共同構成較高的覆蓋率，缺陷位置的數量減少而抑制漏電流的發生，導致光電流與效率的提升。

In this study, five organic dyes — that is, Mercurochrome , Eosin Y, Coumarin 343, Rose Bengal and D149 ─ were employed as sensitizer to dye-sensitized solar cells（DSSCs）and formed four binary systems. Adsorption ability on TiO2 photoelectrode and efficiency of DSSCs were investigated by binary system. The results exhibit influence of binary organic dyes’ composition versus efficiency could generalize in three types. Type I, adsorption ability of dye with higher efficiency is equal dye with lower efficiency and the plot of composition versus efficiency should be a straight line. Type II, adsorption ability of dye with higher efficiency is stronger than dye with lower efficiency and the plot of composition versus efficiency is a concave-down curve.Type III, adsorption ability of dye with higher efficiency is weaker than dye with lower efficiency and the plot of composition versus efficiency is a concave-up curve. Furthermore, minor dye enhance sensitized ability of major dye with stronger adsorption ability and higher efficiency in Type II system and efficiency has 16～18% enhancement. But this dopant effect has less correlation with adsorption wavelength complementary of binary system. By analysis of efficiency, IPCE, dark current and EIS, this study also presents a possible mechanism of dopant effect－mechanism of suppression of leakage current : Minor dye fill the defect of monolayer to comprise higher coverage together by binary dyes. Suppression of leakage current due to reduce the sites of the defect, and results in enhancement of photocurrent and efficiency.

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