在半導體物理理論上，增加半導體電子電洞的數目，意味著增加了半導體之導電度，本實驗利用半導體吸收特定能量之波長的光會產生電子電洞分離的特性，利用此一特性應用於染料敏化太陽能電池上，研究該機制對染料敏化太陽能電池之影響。
實驗中，以3種不同波長的單色光(365nm，405nm及437nm)分別照射以及搭配氙燈光源照射的兩種照射方式，發現以波長為437nm的單色光單獨照射於染料敏化太陽能電池之光電轉換率為100﹪的前提下，單獨照射波長為365nm的染料敏化太陽能電池之光電轉換率僅為28﹪，但是搭配上氙燈光源照射時光電轉換率卻增為56﹪。推測此現象是因為光度較強的氙燈光源，使染料激發出比僅用365nm單色光更多電子，這些電子去填補照射365nm的單色光所產生出來之電洞，使得光電轉換率增高﹔另一方面，經過365nm的單色光加上氙燈照射產生的淨電流比原本只用氙燈照射電流高出6﹪，此現象暗示著雖然照射365nm的單色光產生的電洞會妨礙電流的輸出，但是照射365nm的單色光也會改變半導體之導電度。故研究顯示，導電度效應強過於電洞之效應。

Semiconductors absorb photos with energy greater than their band gap energy may induce electron-hole pairs. In semiconductor physics, increasing charge carrier improves the electric conductivity of semiconductor. The following methodology was taken to investigate the electric conductivity and the electron hole pairs affected performance of a dye sensitized solar cell.
I applied 3 specific monochromatic light (365nm, 405nm and 437nm, respectively.) mixed with xenon light and normal xenon light separately illuminating on dye sensitized solar cells. At the assumption of the normalized photon to current conversion efficiency of solar cell illuminated by 437nm monochromatic light is 100%, the normalized photon to current conversion efficiency of the solar cell illuminated by 365nm monochromatic light was only 28%, however, that illuminated by 365nm monochromatic light mixed xenon light raised to 58%. The more intense mixed light produced more excited electrons than only 365nm monochromatic light. The holes generated by 365nm monochromatic light is easier to be captured by the electrons in the more intense mixed xenon light irradiation results in higher photon to current conversion efficiency. The output of photocurrent of the dye sensitized solar cell irradiated by 365nm ultraviolet light mixed xenon light was enhanced most significantly by 6.53% compared with that by normal xenon light irradiation.

Contents:
Abstract…...……………………………………………..………………III
List of figures…………...……………………………….……………...VI
List of tables …………………..………………………….……..........VIII
Abbreviations…………………………………………….……….…….IX
Chapter 1 Introduction:
1-1. Introduction………………………………………..……………...1
1-2. Structure of dssc…………………………………………..………4
1-3. Working mechanism of DSSC……………………………………5
1-4: Characterization of Solar cell …………………………………….7
1-5. Semiconductors …………………………………………………11
1-6. Electron transport model ………………………………………..15
1-7. Objective and motivation………………………………………..16
1-8. Titanium dioxide ………………………………………………..17
Chapter 2. Experimental methods…………………...……………….....19
2-1. Materials…………………………………………………………20
2-2. Synthesis of the sensitizer……………………………………….24
2-3. Measurement methods …………………………………………..28
2-4. Experimental section ……………………………………………30

Chapter 3. Result and discussion…………………………………...…...34
3-1. Irradiation only by monochromatic light………………………..34
3-2. Cooperative Irradiation....………………………………...……..39
Chapter 4.Conclusions………………………………….………...….….50
Chapter 5.Reference…………………………………….……...….……56
Chapter 6.Appendix…………………………………….……….………58

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