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研究生:葉威辰
研究生(外文):Wei-Chen Yeh
論文名稱:交流阻抗分析量子點太陽能電池
論文名稱(外文):AC impedance study of the quantum dot sensitized solar cell
指導教授:斯訟平
指導教授(外文):Sung-Ping Szu
口試委員:李明威李英德
口試委員(外文):M. W. LeeY. T. Lee
口試日期:2017-07-31
學位類別:碩士
校院名稱:國立中興大學
系所名稱:物理學系所
學門:自然科學學門
學類:物理學類
論文種類:學術論文
論文出版年:2017
畢業學年度:105
語文別:中文
論文頁數:70
中文關鍵詞:交流阻抗量子點太陽能電池
外文關鍵詞:AC impedancequantum dot sensitized solar cellQDDSCsEIS
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本實驗以連續離子層吸附反應法製作Sb_2 S_3的量子點敏化太陽能電池,以I-V曲線計算轉換效率,然後利用交流阻抗分析不同照光強度與不同偏壓下電荷在各界面移動機制的變化。不論電池的轉換效率高低或照光強度大或小,實驗發現在對電極上的交換電流密度i與在光電極上的電子擴散長度L成類似KWW函數的關係,L=L_0 e^(-(i/i_0 )^β )。此種關係表示電子擴散長度為一分佈函數。但當同一樣品在照光下連續量測的交流阻抗,卻發現交換電流與擴散長度並不滿足KWW函數關係,推測可能原因為量子點遭電解液侵蝕。比較照光加偏壓或不加偏壓的Nyquist圖,不加偏壓的Nyquist圖不需考慮量子點電子在導電帶回復到價電帶的機制,這是因為這機制發生頻率太低,所以被雜訊所覆蓋。
We have used ac impedance to study the quantum dots solar cells illuminating under different light intensities as well as using different bias voltages. KWW relationship is found between the exchange current density ialong the counter electrode and the effective electron diffusion length L in the photoelectrode, L=L_0 e^(-〖(i⁄(i_0))〗^β ). This indicates that the effective electron diffusion length is a distribution function in the photoelectrode. However, the KWW relation between i and L is not valid for a battery under the continuous light illuminating. The possible reason is due to the eroding of quantum dot by electrolyte. The mechanism of electron transition from conduction band back to valence band in the quantum dot can be ignored in fitting the Nyquist plot for a battery under the light illuminating and without bias voltage applied. This indicate that this process mightoccur at very low frequency regime during the impedance measurementthat will masked by noise.
摘要................................................................................................................i
Abstract.........................................................................................................ii
目錄..............................................................................................................iii
表目錄..........................................................................................................vi
圖目錄........................................................................................................viii
第一章 緒論.................................................................................................1
1-1 前言..........................................................................................1
1-2 文獻回顧...............................................................................5
1-3 研究動機..................................................................................7

第二章 實驗原理..............................................................8
2-1 QDSSCS結構........................................................................8
2-2 QDSS工作原理…….............................................................8
2-3 QDSSC內部組成…………….............................................10
2-3-1 透明導電玻璃基板.............................................................10
2-3-2光電極的組成........................................................................11
2-3-3 電解液...................................................................................13
2-3-4對電極....................................................................................13

2-4 溶凝膠法...........................................................................14
2-5 量子點的合成........................................................16
2-6 太陽光與模擬光原..................................................................17
2-7 直流量測......................................................................18
2-8 交流阻抗量測......................................................................21
第三章 實驗流程………………………………..…………....………….31
3-1 實驗儀器................................................................................31
3-2 實驗藥品............................................................................32
3-3 量子點太陽能電池實驗製作................................................33
3-3-1 FTO玻璃切割與清洗................................................33
3-3-2緻密層 …................................................................35
3-3-3 光陽極的製備...................................................................36
3-3-4 Pt對電極的製作..............................................................39
3-3-5多碘電解液..............................................................39
3-3-6 電池的封裝..........................................................................40
3-3-7 效率的量測..........................................................................41
3-3-8 EIS的測量..........................................................................41

第四章 結果討論.......................................................................................42
4-1 交流阻抗分析.......................................................................42
4-2 電池連續照光下電池參數比的變化...................................46
4-3 照光樣品交流阻抗的量測................................................48
4-3-1 樣品效率比較....................................................................49
4-3-2 樣品照光不加偏壓交流阻抗分析…..................................51
4-3-3 樣品照光加偏壓交流阻抗分析.................... ...................57

第五章 結論...............................................................................................67

參考文獻.....................................................................................................69
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