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研究生：	辛哈努 Singhanu, Nidarut
論文名稱：	利用氧化鋁層提高染料敏化太陽能電池的效率 Efficiency Enhancement in Dye-Sensitized Solar Cells by Utilization of Al2O3 Layers
指導教授：	楊毓民 Yang, Yu-Min
學位類別：	碩士 Master
系所名稱：	工學院 - 化學工程學系 Department of Chemical Engineering
論文出版年：	2010
畢業學年度：	98
語文別：	英文
論文頁數：	120
外文關鍵詞：	Dye-sensitized solar cell, Alternating assembly structure, Organic dye, Dye cocktails, Alumina interlayer, Alumina outer layer
相關次數：	點閱：92 下載：1
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In this work, an alternating assembly structure of organic dye and metal oxide layer in multi-layer dye-sensitized solar cell was proposed as a strategy to hopefully enhance the overall photon-electron conversion efficiency of the as-fabricated solar cells. Both single dye (D149) and dye cocktails (D149/Mercurochrome = 60:1) sensitizers were examined while Al2O3 was utilized as the modification material. The modification and sensitization process were repeated several times in the alternating assembly. The experimental results revealed that the cells with two cycles alternating assembly structure of dye/Al2O3 exhibited the best performance and raised the conversion efficiency from 4.74% to 5.68% by 20% for single dye and from 4.74% to 5.81% by 23% for dye cocktails, respectively. These results suggested that Al2O3 interlayer can increase the amount of dye adsorption and prohibit the dye aggregation, while the alumina outer layer plays a role in retarding the recombination reaction. These effects were investigated by current density-voltage characteristics, ultraviolet-visible spectrum, dark current measurements, and electrochemical impedance spectroscopy.

ABSTRACT	I
ACKNOWLEDGEMENT	II
TABLE OF CONTENTS	III
LIST OF TABLES	VII
LIST OF FIGURES	IX

CHAPTER ONE INTRODUCTION	1
   1.1 Background and Motivation of the study	1
   1.2 Objective of the study	2
   1.3 Outline of the thesis	3
CHAPTER TWO THEORETICAL	5
   2.1 Dye-sensitized nanostructured solar cells	5
       2.1.1 Operating principle of the dye-sensitized solar cell	5
       2.1.2 The evolution of dye-sensitized solar cells	9
   2.2 Basics of photovoltaic energy conversion	16
       2.2.1 Solar irradiation and availability of salar electricity	16
       2.2.2 Photovoltaic cell performance	17
   2.3 Incident photo to current conversion efficiency	19
   2.4 Electrochemical impedance spectroscopy	20
       2.4.1 The theory in AC impedance	20
2.4.2 Dye-sensitized solar cell using elctrochemical impedance   spctroscopy	23
   2.5 Dye sensitizer	25
       2.5.1 Individual dye sensitization	25
       2.5.2 Co-sensitization	28
            2.5.2.1 Dye cocktails approach	30
   2.6 Dye multilayer	35
CHAPTER THREE EXPERIMENTAL	40
   3.1 Chemical and materials	40
       3.1.1 Chemicals	40
       3.1.2 Materials	42
   3.2 Apparatus and analyses	43
       3.2.1 Instruments	43
       3.2.2 Analyses	44
   3.3 Preparation of the dye-sensitized solar cells	50
       3.3.1 Substrates	50
            3.3.1.1 Pretreatment of ITO substrate	50
       3.3.2 Nanoparticle electrodes	51
            3.3.2.1 Preparation nanostructured TiO2 electrodes	51
            3.3.2.2 Deposing the TiO2 layer on the glass plate	53
       3.3.3 Dye sensitizer	54
       3.3.4 Prepation of Al2O3 layers	57
       3.3.5 Cell configurations	57
  3.3.5.1 The alternating assembly structure in single dye approach	58
  3.3.5.2 The alternating assembly structure in dye cocktails approach	59
       3.3.6 Counter-electrode	60
       3.3.7 Electrolyte	61
       3.3.8 Assembling the cell	61
       3.3.9 Testing the dye solar cells	62
CHAPTER FOUR RESULTS AND DISCUSSIONS	63
   4.1 Characterization of the nanocrystalline TiO2 thin film	63
       4.1.1 SEM analysis	63
            4.1.1.1 TiO2 layer thickness	63
            4.1.1.2 The TiO2 surface morphology	66
       4.1.2 XRD analysis	66
   4.2 The absorption spectra characteristic of organic dye	68
       4.2.1 Mercurochrome	68
       4.2.2 D149	71
       4.2.3 Co-sensitization of organic dyes	72
   4.3 The single dye approach by utilization of Al2O3 layers	73
       4.3.1 D149 dye adsorbed on TiO2 film	74
            4.3.1.1 Photovoltaic performance of the DSSCs	74
            4.3.1.2 The absorption spectra characteristic of D149 dye	75
4.3.2 D149 dye adsorbed on TiO2 film utilizing Al2O3 as the outer layer	76
            4.3.2.1 Photovoltaic performance of the DSSCs	76
      4.3.3 D149 dye adsorbed on TiO2 film by utilization of Al2O3 layers	77
            4.3.3.1 Photovoltaic performance of the DSSCs	78
  4.3.3.2 The absorption spectra characteristic of D149 dye by utilization of Al2O3 layers	81
            4.3.3.3 Dark current	82
4.3.4 The DSSCs fabricated at 2 cycles of Al2O3 with various immersion times of D149 dye sensitizer	84
            4.3.4.1 Photovoltaic performance of the DSSCs	84
   4.4 The dye cocktails approach by utilization of Al2O3 layers	85
       4.4.1 Dye cocktails adsorbed on TiO2 film	86
  4.4.1.1 The absorption spectra characteristic of D149 and Mercurochrome dye sensitizer	86
            4.4.1.2 Performance of the DSSCs with dye cocktails	87
            4.4.1.3 Dark current	91
4.4.2 Dye cocktails adsorbed on TiO2 film by utilization of Al2O3 layers	92
            4.4.2.1 Photovoltaic performance of the DSSCs	93
            4.4.2.2 The absorption spectra characteristic	95
            4.4.2.3 Dark current	96
   4.5 Electrochemical impedance spectroscopy analysis	98
CHAPTER FIVE CONCLUSIONS AND SUGGESSIONS	105
   5.1 Conclusions	105
   5.2 Suggestions	107
REFERENCES	109
                                    

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