低價位雞尾酒染料敏化太陽能電池

Low cost dye-cocktail sensitized solar cell

李偉呈(Wei-cheng Lee)

指導教授 ： 段葉芳

國立臺北科技大學/工程學院/化學工程研究所/碩士(2008年)

摘要

新一代染料敏化太陽能電池於實驗室階段效率可達11％，商業化應用上可達7％。雖然染料敏化太陽能電池已經突破實驗室階段，但是由於使用以釕為中心金屬的染料，使得價格仍然偏高。本實驗嘗試以雞尾酒有機染料-即混合兩種市售便宜的染料-以共同敏化的方式，組裝成太陽能電池，並探討雞尾酒有機染料對光的吸收及其與光電轉化效率的關聯。本實驗挑選的染料為Acid Black 1、Curcumin、Erythrosin B 及Lissamine Green B，先分析UV-vis吸收圖譜，判斷吸收光譜的互補性。並使用循環伏安法求得染料的氧化還原電位，計算出染料的HOMO及LUMO能階。在工作電極方面，添加便宜的PEG6000取代PEG20000來增加成膜後工作電極TiO2中的比表面積。在電解質方面，分別以不同碘化物及不同溶劑作為電解液，膠態電解質使用含浸液態電解液的高分子薄膜PVDF/HFP，分別探討其對光電轉換效率的影響。在對電極嘗試用便宜的高分子聚合物PEDOT取代昂貴的Pt，進行光電轉換效率的測定。最後再以五種比例的Curcumin-Erythrosin B雞尾酒染料組合來測試入射光電轉化效率（IPCE）及總效率。實驗結果顯示，任何雞尾酒染料的光譜吸收範圍都較單一染料的吸收光譜寬廣，但卻只有雞尾酒染料Erythrosin B – Curcumin的光電轉換效率比單一染料Erythrosin B和染料Curcumin還要高。

關鍵字

染料敏化太陽能電池 ； 雞尾酒染料 ； 光電轉換效率 ； 共敏化

並列摘要

The efficiency of new dye-sensitized solar cell can approach up 11% in lab, 7% in module. Although dye-sensitized solar cell has already in practice, but with using ruthenium dye as sensitizer the cost is still too high. In stead of ruthenium dyes, dye cocktail which contains two commercial cheap dyes with various compositions were applied to co-sensitize the solar cell in this research. Acid Black 1、Curcumin、Erythrosin B and Lissamine Green B were analysis by the UV-vis adsorption spectrum. Using cyclic voltammogram to get the reduction potential and the oxidation potential of dye, and calculate the molecular orbital (HOMO, LUMO) to estimate if the electron transfer is unhindered. The adsorption spectrum properties and light to electron conversion efficiency were investigated in this study. Displace PEG20000 by cheaper PEG6000 in TiO2 to increase specific surface area after film formed. Using different iodide and solvent as liquid electrolyte, and use PVDF-HFP polymer thin film immerse to liquid electrolyte as quasi-solid-state electrolyte, secondly measure photo-electron conversion efficiency of liquid electrolyte and quasi-solid-state electrolyte. As to counter electrode, I use cheaper polymer PEDOT to replace Pt and measure photo-electron conversion efficiency. Finally, measure the IPCE and photo-electron conversion efficiency of five different ratios of Curcumin - Erythrosin B combinations. The result shows that, under all combination, the UV-vis adsorption spectrum region of dye-cocktail is always wider than single dye. However, only dye cocktail Erythrosin B - Curcumin have higher photo-electron conversion efficiency than single dye Erythrosin B and single dye Curcumin.

並列關鍵字

dye sensitized solar cell ； dye-cocktail ； photo-electron conversion efficiency ； co-sensitization

參考文獻

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