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研究生： 賽錫望
Setiawan, Hendri Evan
論文名稱： 利用金屬氧化物當阻絕層提升有機染料敏化太陽能電池的效率
Photovoltaic Properties Enhancement in Organic Dye-Sensitized Solar Cells by Using Secondary Metal Oxides as Blocking Layer
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： 2011
畢業學年度： 99
語文別： 英文
論文頁數： 112
外文關鍵詞： Dye-sensitized solar cell, Blocking layer, Alternating assembly structure, Organic dye, Dye cocktails
相關次數： 點閱：59  下載：6 
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    • Secondary metal oxides as blocking layer is employed at the interface of TiO2 films, and its influence on dye-sensitized solar cells (DSSCs) is investigated. Al2O3 and MgO were fabricated by dipping mesoporous, nanocrystalline TiO2 films in precursor. These secondary metal oxides are shown in all cases to act as blocking layers retarding recombination. Al2O3 and MgO blocking layer resulted in a 10% and 15% enhancement respectively. The modification and sensitization processes were repeated several times in the alternating assembly. The experimental results revealed that the cells with two cycles exhibited the best performance and raised the conversion efficiency by 17.14% for Al2O3 blocking layer, and 17.65% for MgO blocking layer, respectively. These results suggested that secondary metal oxides can increase the amount of dye adsorption and prohibit the dye aggregation, while the metal oxide layer plays a role in retarding the recombination reaction. The co-sensitization of two organic dyes (D149 and SQ2) by dye cocktails method, which are complementary in their spectral responses, shows enhanced photovoltaic performance by 5.64% compared with that of an individual organic dye-sensitized solar cell. These effects were investigated by current density-voltage characteristics, ultraviolet-visible spectrum, dark current measurements, incident photon to current conversion efficiencies (IPCE), and electrochemical impedance spectroscopy (EIS).

    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 Objectives of the study 3 1.3 Outline of the thesis 4 CHAPTER TWO THEORETICAL 6 2.1 Operational Principle of Dye-Sensitized Solar Cell 6 2.2 Historical Background and Development of Dye-Sensitized Solar Cells (DSSC) 10 2.3 Photovoltaic Parameters that Characterize the Performance of Dye-Sensitized Solar Cell 17 2.3.1 Incident Photo-to-Current Conversion Efficiency ( IPCE) 18 2.3.2 Photocurrent/Voltage Curve (I-V Curve) 19 2.4 Solar Irradiation and Availability of Solar Electricity 22 2.5 Electrochemical Impedance Spectroscopy ( EIS) 24 2.5.1 The theory in AC impedance 24 2.5.2 Dye-Sensitized Solar Cell Using Electrochemical Impedance Spectroscopy 26 2.6 Dye Sensitizer 28 2.6.1 Individual dye sensitization 28 2.6.2 Co-sensitization 31 2.6.2.1 Dye cocktails approach 33 2.6.2.2 Bandgap Cascade 38 2.7 Metal Oxide as Blocking Layers 39 CHAPTER THREE EXPERIMENTAL 44 3.1 Chemical and Materials 44 3.1.1 Chemicals 44 3.1.2 Materials 46 3.2 Instrumentation 46 3.3 Preparation of the dye-sensitized solar cells 51 3.3.1 Substrates 51 3.3.1.1 Pretreatment of FTO substrate 52 3.3.2 Nanoparticle electrodes 53 3.3.2.1 Preparation of nanostructured TiO2 electrodes 53 3.3.3 Dye Sensitizer 56 3.3.4 Preparation of Al2O3 layers 58 3.3.5 Preparation of MgOlayers 58 3.3.6 Cell configurations 58 3.3.7 Counter-electrode 59 3.3.8 Electrolyte 59 3.3.9Assembling the cell 60 3.3.10 Testing the dye solar cells 61 CHAPTER FOUR RESULTS AND DISCUSSION 62 4.1 The absorption spectra characteristic of organic dye 62 4.1.1 D149 62 4.1.2 Mercurochrome 64 4.1.3 SQ2 66 4.1.4 Co-sensitization of organic dyes 68 4.2 Effect of Al2O3 and MgO as blocking layer by single dye approach 69 4.2.1 D149 dye adsorbed on TiO2 film 69 4.2.1.1 Photovoltaic performance of the DSSCs 69 4.2.1.2 The absorption spectra characteristic of D149 dye 71 4.2.2 D149 dye adsorbed on TiO2 film utilizing Al2O3 as the blocking layer 72 4.2.3 D149 dye adsorbed on TiO2 film utilizing MgO as the blocking layer 74 4.2.4 Comparison between Al2O3 and MgO as blocking layer 76 4.2.5 Effect of MgO blocking layer by using different dyes 79 4.3 Single dye approach by utilization of Al2O3 and MgO layer in alternating assembly structure 81 4.3.1 Single dye approach by utilization of Al2O3 layer 81 4.3.2 Single dye approach by utilization of MgO layer 85 4.4 Double dye approach 87 4.4.1 Bandgap cascade method 88 4.4.2 Dye cocktails method 93 4.5 Electrochemical Impedance Spectroscopy Analysis 98 CHAPTER FIVE CONCLUSIONS 100 REFERENCES 102

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