石墨烯/氧化鋅奈米顆粒複合薄膜應用於染料敏化太陽能電池之研究

本研究探討將石墨烯摻入氧化鋅工作電極對染料敏化太陽能電池的影響，主要的控制變因有石墨烯的種類、石墨烯酸化與否、石墨烯的添加量以及氧化鋅薄膜厚度。本研究使用二種來源不同的石墨烯，一種是市售，一種是用Staudenmaier法合成，並使用混酸(硝酸：硫酸= 3：1)在60 ℃反應2 h加以官能基化。我們將石墨烯按兩種不同比例(0.01 %與0.05 %)摻入氧化鋅奈米顆粒配製成漿料，再以刮刀法搭配低溫熱處理(150 ℃, 1 h) 於FTO導電玻璃上形成薄膜，並以N719染料敏化後，製成染料敏化太陽能電池。研究結果顯示酸化處理可於石墨烯表面產生羧基、羥基等官能基，可以提高石墨烯在極性溶劑中的分散性，降低石墨烯團聚的情況。添加適量(0.01 %)的石墨烯可提升電池元件的短路電流密度與光電轉換效率，石墨烯添加量過高(0.05 %)反而使元件光電轉換效率下降。添加0.01 % 的Staudenmaier法石墨烯，可使元件光電轉換效率提升至3.67 %，相對於未添加石墨烯的元件效率3.06 %，增加幅度約20 %。添加0.01 %官能基化的市售石墨烯也有類似效果，元件效率最高達3.47 %。

關鍵字

石墨烯；氧化鋅；染料敏化太陽能電池

並列摘要

The effects of zinc oxide doped graphene working electrode of dye-sensitized solar cells were investigated in this study. The control variables included the dispersion of graphene, the size of graphene, the amount of functional groups of grapheme, and the graphene content and thinckness of the Graphene/zinc oxide composite films. During graphene doping zinc oxide process, the graphene dipped in the mixed acid ( nitric acid : sulfuric acid = 3 : 1 ) was treated in ultrasonic bath at 60 ℃ for 2 hours. The treated graphene was cleaned with deionized water until neutral. After drying in an oven, we ground the treated graphene to powder. The powder, the treated graphene, zinc oxide nanoparticles and t-BuOH solution were mixed into the paste. The working electrode films were prepared by the doctor-blade method. The fabrication of the Graphene/zinc oxide composite films were carried out by a furnace at 150 ℃ for 1 hour. After acidification, the surface of graphene contains carboxyl and hydroxyl functional groups could improve the dispersion of graphene in a polar solvent to reduce aggregation. Besides, the functional groups of graphene linking with zinc oxide could enhance the transport of electrons. The graphene has high electron mobility due to the planar mesh structure, therefore it could effectively transmit electrons injected from the zinc oxide. The dye-sensitized solar cells with the Graphene/zinc oxide composite films were improved the short circuit current density from 6.71 mA/cm2 to 9.20 mA/cm2, and the corresponding photoelectric conversion efficiency were enhanced from 3.06 % to 3.67 %. The enhancement ratio was achieved to 20 %.

並列關鍵字

Graphene ； ZnO ； Dye-sensitized solar cells

參考文獻

28. 林峻民，電化學沉積氧化鋅薄膜應用於可撓式染料敏化太陽能電池之研究，碩士論文，國立台北科技大學有機高分子研究所，台北，2012

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石墨烯/氧化鋅奈米顆粒複合薄膜應用於染料敏化太陽能電池之研究

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