本研究開發一個新式三明治TiO2薄膜結構，並應用於染料敏化太陽能電池之光電極；此結構是在一般常用的雙層薄膜(吸光層/散射層)後面再增添一層吸光層，形成「吸光層/散射層/吸光層」之三明治結構。相較於常用的雙層薄膜，此三明治結構不只增加來自光電極側的入射光使用率(正照)，亦能有效利用由對電極側入射之光子(背照)，因而可提升雙面照光型染敏電池之效能。本研究首先對此三明治結構中的TiO2薄膜厚度進行優化，並搭配弱吸光性的鈷錯合物氧化還原對與高穿透度對電極來製備室內型染敏電池。結果發現，在最佳薄膜條件下，染敏電池在螢光燈200 lux環境中的正照與背照光電轉換效率分別達到21.4%及18.8%，其背/正照效率比值為0.88，相對於使用一般雙層薄膜之電池(正照效率為20.5%，背/正照比值0.76)，顯示出此三明治結構優異的雙面受光能力。
另一方面，本研究亦將三明治TiO2薄膜結構應用於製備室外型染敏電池，並探討三苯胺衍生物(TPAA)作為電解質添加劑時，對於染敏電池效能之影響。三苯胺衍生物可作為電子施體，增進氧化態敏化劑之還原，故可抑制氧化態敏化劑與光電極電子之間的再結合反應。結果發現，電解質中添加三苯胺衍生物之後，染敏電池於標準太陽光下具有較高的開路電壓，轉換效率由8.04%提升至9.33%，同時背/正照效率比值達0.88。當電解質進一步加入高分子產生膠化後，相關膠態電池不僅有9.02%之轉換效率以及相同之背/正照比值，並在50oC存放1000小時之後仍可獲得極佳的光電轉換表現。

In this study, a novel structured TiO2 thin films is developed and utilized as photoelectodes of dye-sensitized solar cells (DSSCs). This sandwich-structured thin film noted “main layer/scattering layer/main layer” is prepared by adding another main layer behind a normal double-layer thin film (main layer/scattering layer). Compared with the double-layer photoelectodes, the sandwich-structured thin film photoelectodes not only can enhance the light harvest ability of front-side illumination, but also can adsorb light effectively from rear-side illumination. As a results, it improves the cell performances for bifacial-light-illuminated DSSCs. Firstly, the thickness of TiO2 thin film is optimized to get the best performance with a highly transparent counter electrode, and the sandwich-structured TiO2 thin film creates the highest conversion efficiencies of 21.4% and 18.8% under front-side and rear-side fluorescent lighting illumination (T5, 200 lux). Moreover, it gets 0.88 of rear/front-side efficiency ratio and demonstrates a high potential for bifacial-light cell application.
Furthermore, this sandwich-structured thin film DSSCs also applies for outdoor application (1-sun irradiation) and discusses the effect of triphenylamine derivatives as electrolyte additives. Triphenylamine derivatives are used as electron donors to enhance the reduction of oxidized sensitizers and inhibit the charge recombination. Therefore, it creates higher Voc to increase the conversion efficiency from 8.04% to 9.33% with 0.88 of rear/front-side efficiency ratio. The recipe of the electrolyte is also utilized to prepare quasi-solid state electrolyte and the corresponding DSSC shows a good conversion efficiency of 9.02% and same rear/front-side ratio. Moreover, the quasi-solid-state DSSC still maintains 1000% of its initial efficiency after 1500hr at 50℃.

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