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研究生:朱慶峰
研究生(外文):Chu, Ching Feng
論文名稱:色素增感型太陽電池電解質系統之電化學研究
論文名稱(外文):Electrochemical study of the mediators for the Dye-sensitized solar cells
指導教授:姚品全姚品全引用關係
指導教授(外文):Pin-Chuan Yao
學位類別:碩士
校院名稱:大葉大學
系所名稱:電機工程學系碩士在職專班
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2004
畢業學年度:95
語文別:中文
論文頁數:124
中文關鍵詞: 奈米TiO2粉體 色素增感型太陽電池 染料 電解質
外文關鍵詞:dye-sensitized solar cellsTiO2PEGTriton X-100cyclic voltammetery
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本研究針對工作電極的重要製程參數對DSSC光電轉換效率之影響,作較為詳細探討與解釋。主要參數包括控制TiO2薄膜孔隙度的添加劑(polyethylene glycol, PEG)、影響奈米TiO2晶粒分散情形,以利於成膜的界面活性劑(Triton X-100)以及TiO2薄膜的燒結溫度。此外對於工作電極的電化學特性略加探討,以與文獻中發表結果對照,作為爾後研究之參考依據。結果顯示TiO2薄膜的燒結溫度與開路電壓與短路電流之影響甚為明顯,燒結溫度為450oC時,有最大之開路電壓,Voc=417 mV, 短路電流隨燒結溫度增加而增加,由400oC時Jsc=0.99 mA/cm2, 增為550oC時,Jsc=2.7 mA/cm2, 填充因子FF超過500oC時開始明顯下降,综合以上數據,推論450~500oC為適當之燒結溫度。Triton X-100的添加量,在0.05~0.1 ml/3g of P25內均為適宜。此時Voc=518 mV, Jsc=2.1 mA/cm2, 填充因子FF與Triton X-100的添加量關聯性很低。PEG(polyethylene glycol, MW=6000) 的添加,可以調整TiO2薄膜的孔隙特性,經過多次的樣品製備與量測所得結果顯示:PEG的添加有助於短路電流之提昇,最大值出現於PEG=0.9g/3g of P25,此時Jsc=3.9 mA/cm2, 反之PEG的添加與否,對DSSC的Voc影響很小,不過PEG添加超過0.15g/3g of P25時,填充因子FF因為TiO2薄膜內含有機雜質成份漸增,因而導致FF下降。電化學分析(循環伏安法)得知:在工作電壓範圍內,無明顯氧化-還原峰,顯示本研究製備之TiO2薄膜工作電極具有良好的電化學特性。
In this study, the important process parameters in fabricating dye-sensitized solar cells(DSSC) such as the sintering temperature of TiO2 thin film, the additives during the film forming stage such as Triton X-100(surfactant for nano-powders dispersion) as well as polyethylene glycol(PEG, porosity control agent) were extensively studied. Besides, the electrochemical properties of the TiO2 working electrode were investigated by cyclic voltammetery in comparison with those described in published papers as a basis for further analysis. The results show that the sintering temperature of TiO2 thin film has prominent effect on the Voc and Isc of the DSSC. The Voc has its maximum value of 417 mV at T=450oC while the Jsc increase as the T was increased. Therefore, Jsc=0.99 mA at T=400 oC and elevated to Jsc=2.7 mA/cm2 at 550oC. As the sintering temperature increase, the fill factor (FF) diminished. Consequently, the suitable value for the sintering temperature of TiO2 thin film is 450~500oC. The surfactant, Triton X-100 has optimal addition amount of 0.05~0.1 ml/3g of P25 in which the DSSC has performance of Voc=518 mV, Jsc=2.1 mA/cm2 while the introduction of Triton X-100 ahs no effect on FF. The porosity control of TiO2 thin films by the introduction of PEG has been proven. In our study, adding small amount of PEG(0.9g/3g of P25) has improved the Jsc to as high as 3.9 mA/cm2, while more PEG has detrimental effects on Jsc owing to the residues of polymer. Besides, the PEG addition has minor effect on Voc of the as-prepared DSSC. Similarly, as PEG exceeded 1.2 g/3g of P25, the FF of DSSC decreased immediately for the similar reason described above. The electrochemical analysis(cyclic voltammetery) shows that the TiO2 films owns quite good electrochemical reversibility in which there is no evident faradaic current within the operation voltage of the solar cells.
封面內頁
簽名頁
授權書.........................iii
中文摘要........................iv
英文摘要........................v
誌謝..........................vi
目錄..........................vii
圖目錄........................x
表目錄........................xiii

第一章 緒論
1.1 前言....................1
1.2 電化學反應系統...............3
1.3 電化學反應程序...............5
1.4 色素增感型太陽能電池電化學反應因素.....8
1.5 色素增感型太陽能電池工作原理........9
1.6 研究背景與目的...............12
第二章 文獻回顧與理論說明...............13
2.1 色素增感型太陽電池.............13
2.1.1 有機-無機混合型太陽電池........14
2.1.2 光電化學電池原理...........17
2.1.3 半導體-電解質接面 ...........19
2.1.4 色素增感原理.............23
2.1.5 DSSC 技術進展............25
2.1.6 DSSC未來的研發方向..........29
2.2 電化學...................33
2.2.1 電化學反應系統.............33
2.2.2 影響電化學反應系統的因素........36
2.2.3 電解質................37
2.2.4 電位測定法..............42
2.2.5 線性擴散...............43
2.2.6 循環伏安法(Cyclic Voltammetry, CV) ...44
2.3 溶膠-凝膠法製程簡介............53
第三章 實驗方法....................56
3.1 實驗器材..................56
3.2 實驗藥品..................57
3.3 實驗方式..................58
3.4 DSSC材料之製備..............59
3.4.1 二氧化鈦的製備.............59
3.4.2 工作電極的製備.............62
3.4.3 染敏色素塗佈..............63
3.4.4 對電極(counter electrolyte)觸媒塗佈製備...68
3.5 DSSC電化學分析實驗............68
3.5.1 電化學測試裝置.............69
3.5.2 電化學分析 ..............70
3.5.3 穩定性實驗 ..............71
3.5.4 可逆性實驗..............71
3.5.5 循環伏安法之應用 ...........72
3.6 DSSC光電特性(I-V)量測...........82
3.6.1 DSSC電解液的製備...........84
3.6.2 DSSC光電轉換效能(IPCE)評估......86
第四章 TiO2工作電極孔隙特性之探討...........87
4.1 DSSC工作原理................87
4.2 TIO2工作電極燒結溫度之影響分析.......89
4.3 TIO2工作電極孔隙度調整-界面活性劑之影響分析.92
4.4 TIO2工作電極孔隙度調整-PEG之影響分析....95
第五章 DSSC電解質電化學特性探討 ...........97
5.1 電解質溫度及掃描速率循環伏安行為的探討....97
5.1.1電解液於不同掃描速率之分析.......97
5.1.2電解液於不同溫度之分析.........99
5.1.3電解液於高溫度及高掃描速率之分析....101
5.2 DSSC對電極之溫度及掃描速率影響分析.....104
第六章 討論與建議...................109
6.1 綜合討論...................109
6.2 二氧化鈦薄膜對DSSC太陽能電池影響......110
6.3 DSSC電解質對溫度及掃描速率之影響......112
6.4 建議....................113
參考文獻........................115
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