摘要
二氧化鈦在不同條件的酸處理過程下，表面狀態以及形貌產生變化。利用SEM、EDS、XRD、UV/Vis以及介達電位儀來分析經由不同酸處裡條件下得到的二氧化鈦粉末性質。並製作成太陽電池量測其光電轉換效能。
我們發現經由酸處理過後的二氧化鈦，其表面電位隨著酸處理濃度而改變，酸濃度越高，二氧化鈦粉末的表面電位也跟著提高。但酸處理並不會改變二氧化鈦的內部結構，由XRD分析也可以得知酸處理也不會改變二氧化鈦的晶粒大小。經由EDS分析可知酸處理過後也沒有異質元素的摻入。
經過酸處理之後的二氧化鈦粉末所製作成的光電池裝置，其光電轉換效率有大幅的提升。固態半導體理論支持了本實驗中的結果，表面電位的提升降低了顆粒介面的接觸能障，並提升了電子的穿隧機率；利用兩點探針量測也證實酸處理過二氧化鈦電極電阻之下降。

The surface properties and morphologies of titanium dioxide were modified by acid treatment. The titanium dioxide powders treated by various acids were examined by SEM, EDS, XRD, UV/Vis and zeta-potential meter, and were made to be electrode in solar device. The influence of acid treatment was studied in details.
We find the zeta-potential of acid-treated titanium dioxide increases with increasing of acid concentration. On the other hand, the microstructure and grain size of titanium dioxides do not be changed after acid treated. Furthermore, according to EDS analysis, no extra elements in the titanium dioxide were observed.
The photoelectron conversion efficiency of the solar devices markedly increases as the anodes were made by acid-treated titanium dioxides, owing to the reducing of the potential wall between grains and increasing of electron tunneling probability by increasing the surface charge of titanium dioxide. According to resistance measurement, the resistance of the electrode made by acid treated titanium dioxide is lower than that made by titanium dioxide without acid treatment.

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