- 期刊
染料敏化太陽能電池之二氧化鈦薄膜的電泳法製備研究
Electrophoretic Deposition of TiO2 Films for Dye-Sensitized Solar Cells
摘要
染料敏化太陽能電池的光電轉換效率深受光電極薄膜中載子傳遞速率影響。本研究是以自行開發的合成法製備二氧化鈦奈米顆粒，分別以Paste-coating及Electrophoretic Deposition法製作光電極薄膜，以氮氣吸脫附分析、SEM了解比表面積及孔徑分佈，再以I-V curve比較二者的光應答特性，配合IMPS、EIS了解載子傳遞特性，依此比較不同薄膜製備法對電子傳遞的影響。經氮氣吸脫附分析及SEM觀測，發現電泳法擁有較高的比表面積及緊密的堆疊。在光應答方面，因為電泳法製備薄膜擁有較高的電流表現，在光電轉換效率上明顯優於Pastecoating，以IMPS分析結果發現電泳法的電子傳遞時間僅為Paste-coating的一半，但IMVS的測試顯示電子生存時間較短。EIS分析電池參數，發現電泳法有極佳的表現，在電子蒐集效率上高達91％，擴散長度最高可達43μm，表現優異。經由實驗得知，因為電泳法製備薄膜的緊密堆疊，造成染料吸附量提高，電子傳遞路徑縮短並更順暢，因此電子蒐集率高，使得電流高於Paste-coating，擁有較佳的效率表現。
並列摘要
The electron transfer rate in the nanocrystalline TiO2 electrode govern the performance of a dye-sensitized solar cell (DSSC). In this study, TiO2 colloids derived from a titanate-directed route and used to prepare electrode by two methods: Paste-coating and Electrophoretic Deposition.By the analysis of nitrogen absorption-desorption and SEM, electrophoretic solution has higher surface area, and the electrode morphology was dense packing. Cell performance of electrophoretic electrode was better than paste-coating because of its high current density. IMPS showed a higher electron transfer rate for electrophoretic electrode, but the electron lifetime is shorter by the IMVS analyzing. In EIS testing, the charge collection efficiency and diffusion length were 91% and 43μm, respectively.The dense packing caused the much more dye to absorb, decreased the path for electron transfer, so electrophoretic electrode has higher charge collection efficiency, current density, and lower open-circuit voltage.