臺灣博碩士論文加值系統

本實驗以溶膠-凝膠法製備出在pH=3~11不同酸鹼值環境下的二氧化鈦顆粒以及以逆微胞法合成出約5nm硫化鎘量子點。控制二氧化鈦與硫化鎘量子點不同的比例製作成TiO2與CdS均勻混合膠體，並應用於量子點敏化太陽能電池的光陽極。由I-V 量測發現pH=7製備的TiO2顆粒與CdS混合膠體製備的電池，由於其CdS量子點易吸附於TiO2上，獲得2.47mA/cm2電流密度、0.68V開路電壓與超過0.8%最佳的光電轉換效率。經由SEM 與EDX Mapping發現，本製程可以明顯改善之前本實驗室直接由溶凝膠法製備產生TiO2經過熱處理後過度聚集成團塊，與量子點分佈不均勻的問題。電池樣品經由EIS量測分析其各界面電荷移動的機制。

In this study, titanium dioxide particles using different pH values ranging from 3 to 11 are prepared by sol-gel method, while, cadmium sulfide quantum dots with size about 5nm are synthesized by reverse micelles method. The photoelectrode paste of the quantum dot-sensitized solar cells are prepared by mixing of different ratio of TiO2 and CdS. The solar cell using the photoelectrode paste that is prepared with pH = 7 and TiO2/CdS=1 has the best performance. The photoelectric conversion efficiency of this cell is 0.8, and the short circuit current density is 2.47mA/cm2,, and the open circuit voltage equals to 0.68V. Ac impedance is employed to investigate the electron transport mechanism between the interfaces of the battery.

摘要 i
ABSTRACT ii
目錄 iii
表目錄 v
圖目錄 vi
第一章　緒論 1
1.1　前言 1
1.2　QDSCs發展現況 2
1.2.1　減少電子-電洞對的複合 3
1.2.2　電解液性能的提升 4
1.2.3　光陽極的研究進展 4
1.2.4　對電極(Counter Electrode, CE) 9
1.3　動機 10
第二章　實驗原理 11
2.1　QDSCs工作原理&元件組成結構 11
2.1.1　FTO(Fluorine-doped Tin Oxide)透明導電玻璃 12
2.1.2　TiO2緻密層光電極 12
2.1.3　TiO2顆粒&CdS量子點混合膠體 13
2.1.4　多碘電解液 15
2.1.5　Pt對電極 15
2.2　溶膠-凝膠法(Sol-Gel Method) 16
2.3　逆微胞法(Reverse Micelles Method) 17
2.4　QDSCs模型與電性量測 18
2.4.1　直流電分析(I-V curve) 18
2.4.2　交流電分析-電化學阻抗頻譜(Electrochemical Impedance Spectroscopy) 19
第三章　實驗流程 25
3.1　材料與化學藥品 25
3.2　中孔洞TiO2緻密層光電極的製備 25
3.3　合成TiO2與CdS量子點混合膠體 26
3.4　QDSCs的封裝 29
3.5　特性觀察與量測 30
第四章　結果與討論 32
4.1　緻密層光陽極 32
4.2　TiO2與CdS量子點混合膠體 33
4.3　QDSCs電性量測 42
第五章　結論 49
第六章　參考資料 50

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