二氧化鈦奈米晶粒表面處理對染料敏化太陽能電池效率影響之研究

Abstract

本研究將異丙基純氧鈦(TTIP)製作多孔隙二氧化鈦，並經過四氯化鈦(TiCl4)水解方式表面處理後，作為染料敏化太陽能電池(Dye-Sensitized Solar Cells, DSSCs)之工作電極，並探討此表面處理對染料敏化太陽能電池效率的影響。 經過TiCl4水解後產生的TiO2與多孔隙二氧化鈦間產生連結，而影響四氯化鈦水解的主要變因有：(1)濃度，(2)溫度，(3)時間，我們探討了這些因素對電池轉換效率的個別影響，進而優化這些變因。本研究發現，以TTIP為前驅物所製備之工作電極經濃度為0.04 M之TiCl4在溫度70度之表面處理經30分鐘後，DSSCs光轉換效率為最佳，與未經表面處理之電極比較，光電轉換效率增加了1 %。此外，經利用Z-View軟體分析電化學交流阻抗分析(Electrochemical impedance spectroscopy)後得知，經TiCl4表面處理後，改善了電子收集效率，增加了短路電流密度，進而提升了DSSCs之轉換效率。

In this study, a mesoporous titanium oxide powder, which was prepared using titanium iso-propoxide(TTIP) as the precursor, was treated by the hydrolysis of chloride titanium. The resulting film was used as the working electrode in dye-sensitized solar cells. We discussed the difference in photovoltaic efficiency between TiCl4 treated and non-treated electrodes. Experimental results show that the TiCl4 hydrolysis improves the interconnection between TiO2 nanoparticles in the electrode. The main factors affecting the solar cell efficiency are the solution concentration, hydrolysis temperature, and reaction time we optimized these hydrolysis parameters to enhance the cell efficiency. The optimum hydrolysis conditions are as follows: solution concentration: 0.04 M, the temperature: 70 □C, and the reation time: 30 min. According to, electrochemical impedance analysis, the TiCl4 treatment can enhance the electron collection efficiency of the DSSC, resulting in an increased short-circuit current density and thus an increased efficiency.