染料敏化太陽能電池之天然染料研發

本研究以天然染料作為敏化太陽能電池，使用天然染料替代廣泛使用的合成染料。本實驗使用葉綠素及花青素兩種天然染料，葉綠素染料採用艾草萃取，而花青素染料採用紫色甘藍萃取作為研究，此外也將所得之葉綠素及花青素染料以等體積比混合成為雞尾酒方式的染料。萃取天然染料的方法將材料混合於乙醇及甲醇及丙酮三種溶劑中，再以隔水加熱方式淬取染料，加熱溫度為50℃且持續30分鐘。實驗工作電極之製備使用商用P25 TiO2粉末經旋轉塗佈法於ITO 導電面鍍成一層薄膜，製備出不同薄膜厚度作分析，對電極使用之FTO則是以濺鍍法製成厚度約20nm之Pt 電極。各種染料的吸收光譜UV-VIS，葉綠素染料吸收峰在660及410 nm左右，花青素染料吸收峰約在550 nm左右，而雞尾酒染料可以獲得兼具兩者吸收特性，吸收強度為兩種獨立染料之吸收強度範圍內。實驗結果在旋轉塗佈法所製備出的光陽極，薄膜厚度約30、25及20μm，且以無水酒精當溶劑所製備出的雞尾酒染料擁有最大光電轉換效率(η)1.74%，而開路電壓(VOC) 0.619V，短路電流密度(JSC) 5.63mA/cm2。艾草所萃取之葉綠素染料擁有光電轉換效率(η)為0.9%，而紫色甘藍所萃取之花青素染料擁有光電轉換效率1.47%。

關鍵字

天然染料；雞尾酒；葉綠素；花青素；旋轉塗佈法；光電轉換效率

並列摘要

The performance of dye sensitized solar cells is mainly based on the dye as a sensitizer, the natural dyes have extensively replaced synthetic dyes. In the experiments of the research is based on the two natural dyes of chlorophyll and anthocyanin for the study, one of the natural dyes is chlorophyll, which is extracted from wormwood and the other is anthocyanin dye which is extracted from purple cabbage extract. In addition, the chlorophyll and anthocyanin dyes were blended in the proportion of equal volume as cocktail-form dyes. The way of extracting natural dye is to mix the materials in a container of absolute ethanol, methanol and acetone, which is then placed in another container of water for heating and the temperature of heating is 50oC for 30 min, so as to extract dye. Regarding the preparation of electrode for experiments of the study, P25 TiO2 powder for commercial use is coated by Spin coating on the ITO conducting surface to form a thin film. The FTO for use by electrode is Pt electrode at thickness of around 20nm made by sputtering. Each of the dyes absorbs spectrum UV-VIS. The absorption peak of chlorophyll dye is 660 and 410 nm, whereas the absorption peak of anthocyanin dye is 550 nm. But cocktail dye can acquire the absorption features of both dyes, with absorption strength being within the range of absorption strength of these two independent dyes. the photoanode was made by spin coasting, preparation of films have been made at three different speeds 500 1000 1500 rpm, approximately 30, 25 and 20 μm. The result of experiment shown that the film is made at speed 1000rpm with the cocktail dissolve in solvent of absolute ethanol achieve the greatest photo-electric conversion effciency (η) 1.74%, open-circuit voltage (VOC) 0.645V, and short-circuit current density (JSC) 3.16mA/cm2. In addition the chlorophyll dye is extracted from wormwood achieves the photo-electric conversion efficiency (η) 0.9%, moreover the anthocyanin dyes extracted from purple cabbage achieves the photo-electric conversion efficiency 1.47%.

並列關鍵字

Natural dye ； Cocktail ； Chlorophyll ； Anthocyanin ； Spin coating ； Photo-electric conversion efficiency

參考文獻

[18] 羅右任，天然染料應用於染料敏化太陽能電池之特性分析，碩士論文，國立台北科技大學製造科技研究所，台北，2009。

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國際替代計量

染料敏化太陽能電池之天然染料研發

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