混摻奈米顆粒半固態電解質應用於染料敏化太陽能電池之研究

本研究利用數種無機奈米粒子混摻入以PMII為主的液態電解質，以製備半固態電解質，期望藉由改變DSSC元件的離子傳導機制，在提升電解質黏度同時亦提升元件光電轉換效率。本實驗先行調整I2及LiI濃度找出最佳的液態電解質配方，再混摻ZnO、TiO2、SiO2奈米顆粒進行膠化，製備出不同種類的半固態電解質，分析其中不同的奈米顆粒、混摻之奈米顆粒比例、離子擴散係數與光電轉換效率的影響。研究結果顯示，於液態電解質中加入ZnO奈米粒子，除了降低氧化鋅光陽極與電解質之間的阻抗而增加電池的光電流值(JSC)之外，亦可減少電子的再結合機率而提升開路電壓(VOC)。在混摻濃度為35 wt.% ZnO 奈米粒子時，於入射光強度100 mW/cm2之下，光電轉換效率可達4.17 %，相較於液態電解質的轉換效率3.10 %，共提升了34 %。在長效性測試中，電池元件在室溫下放至150天仍可保持原有95%的光電轉換效率。

關鍵字

染料敏化太陽能電池；半固態電解質；奈米顆粒；長效穩定度

並列摘要

In this study, various nanoparticles were employed to solidify 1-propyl-3-methylimidazolium iodide (PMII) based liquid electrolytes in dye-sensitized solar cells (DSSCs). A guideline to prepare high-performance clay-like or gel-like electrolytes having high content nanoparticles was prepared for DSSCs. We aimed at fabricating ionic paths between nanoparticles by chemical bondings. Photovoltaic performances of DSCs containing these quasi-solid state electrolytes were studied as well as the influence of solvents, redox couple, additives and the content of nanoparticles. Efficiencies of 4.17% was recorded for the AN-based electrolytes solidified by 35.0 wt.% ZnO nanoparticles, under illumination of simulated AM 1.5 (100mW/cm2). From the electrochemical impedance spectroscopy (EIS) analysis, it was found that the enhanced conversion efficiencies of the DSCs were associated with the decrease in charge transfer resistance at the ZnO/dye/electrolyte if we used the ZnO nanocomposite gel electrolyte.On the other hand, ZnO nanoparticles can inhibit the charge recombination, enhancing the open-circuit voltage of the cells. The DSSCs with a ZnO solidified electrolyte showed endurance of stability superior to that of a pure liquid electrolyte.

並列關鍵字

dye-sensitized solar cells ； quasi-solid state electrolyte ； nanoparticles ； long-term stability

參考文獻

41. 林俊民，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，台北科技大學有機高分子研究所，台北，2012。.

42. S. O. Kasap, Optoelectronics and photonics: principles and practices, United Stated of America: pearson education inc, 2001.

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混摻奈米顆粒半固態電解質應用於染料敏化太陽能電池之研究

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