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研究生： Abebe Tedla Mengstie
Abebe - Tedla Mengstie
論文名稱： Synthesis and Study of Unconventional Electrolytes for Dye Sensitized Solar Cells
Synthesis and Study of Unconventional Electrolytes for Dye Sensitized Solar Cells
指導教授： 戴龑
Yian Tai
口試委員: 何郡軒
Jinn-Hsuan Ho
朱智謙
Chih-Chien Chu
王澤元
Olivier TY Wang
楊重光
Thomas C.-K. Yang
江志強
J.C Jiang
學位類別： 博士
Doctor
系所名稱： 工程學院 - 化學工程系
Department of Chemical Engineering
論文出版年： 2014
畢業學年度： 102
語文別： 英文
論文頁數： 135
中文關鍵詞： Electrolyte 、Dye sensitized solar cell 、hole transporting materials 、binary solvent system
外文關鍵詞： Electrolyte, Dye sensitized solar cell, hole transporting materials, binary solvent system
相關次數： 點閱：172  下載：0 
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    • This thesis work focuses on unconventional electrolytes for both solid and liquid state DSSCs. The first part provides emphasis on the solvents of liquid electrolytes. Binary solvent system (a mixture of BMIMBr and Acetonitrile) was used to dissolve the electrolyte components in the DSSCs, aiming to combine the advantages of both solvents for the development of highly stable DSSC devices with comparable performance. Three types of electrolytes namely AY2, Z959 and a conventional one were prepared using the binary solvents with varied volume of ratio of BMIMBr. DSSC devices based on these electrolytes were fabricated. It has been found that those devices containing ionic liquid demonstrated good stabilities compared to devices composed of pure acetonitrile as a result of the substantially lower vapor pressure of the binary solvent system. The fill factor and open circuit voltage of devices with BMIMBr have shown enhancement in case of all types of electrolytes. However, short current density and conversion efficiency decreased as the amount of ionic liquid proportion increased which could be ascribed to the slow diffusion of ions.
    The second part of this thesis focuses on electrolytes in the solid state DSSCs. New conducting conjugated polymers (Poly(SNS-BBN, coded P2 and Poly(SNS-BBB), coded P1), that could be used as hole transporting material in ss-DSSCs, were synthesized. Devices based on these conjugated polymers were fabricated and characterized. Especially device with poly(SNS-BBB) showed reasonable open circuit voltage (0.8 V) with comparable conversion efficiency to initially reported performance of PEDOT and P3HT. Therefore, the properties and the preliminary result of these new polymers demonstrate that they are promising candidate for hole transporting material in solid state dye sensitized solar cell.

    This thesis work focuses on unconventional electrolytes for both solid and liquid state DSSCs. The first part provides emphasis on the solvents of liquid electrolytes. Binary solvent system (a mixture of BMIMBr and Acetonitrile) was used to dissolve the electrolyte components in the DSSCs, aiming to combine the advantages of both solvents for the development of highly stable DSSC devices with comparable performance. Three types of electrolytes namely AY2, Z959 and a conventional one were prepared using the binary solvents with varied volume of ratio of BMIMBr. DSSC devices based on these electrolytes were fabricated. It has been found that those devices containing ionic liquid demonstrated good stabilities compared to devices composed of pure acetonitrile as a result of the substantially lower vapor pressure of the binary solvent system. The fill factor and open circuit voltage of devices with BMIMBr have shown enhancement in case of all types of electrolytes. However, short current density and conversion efficiency decreased as the amount of ionic liquid proportion increased which could be ascribed to the slow diffusion of ions.
    The second part of this thesis focuses on electrolytes in the solid state DSSCs. New conducting conjugated polymers (Poly(SNS-BBN, coded P2 and Poly(SNS-BBB), coded P1), that could be used as hole transporting material in ss-DSSCs, were synthesized. Devices based on these conjugated polymers were fabricated and characterized. Especially device with poly(SNS-BBB) showed reasonable open circuit voltage (0.8 V) with comparable conversion efficiency to initially reported performance of PEDOT and P3HT. Therefore, the properties and the preliminary result of these new polymers demonstrate that they are promising candidate for hole transporting material in solid state dye sensitized solar cell.

    CONTENTS ABSTRACT i ACKNOWLEDGMENTS ii LIST OF ABBREVIATIONS iii LIST OF FIGURES viii LIST OF TABLES xiii CHAPTER-ONE INTRODUCTION 1 1.1 Background 2 1.2 Working principle of Dye-sensitized solar cells 6 CHAPTER-TWO REVIEW LITERATURE 10 2.1 Developmental overview of Dye-sensitized solar cells 10 2.2. Components of Dye-sensitized solar cells 12 2.2.1 Dyes/sensitizers 12 2.2.2. Photoelectrode (Semiconductor oxides) 17 2.2.3. Counter Electrodes 18 2.2.4 Electrolytes for Dye-Sensitized Solar Cells 19 CHAPTER-THREE EXPERIMENTAL SECTION 31 3.1.1 Materials and Methods 31 3.1.2 Procedure for the synthesis of BMIMBr 32 3.1.3 Preparation of Electrolytes 32 3.1.4 Fabrication of Photoanodes 33 3.1.5 Device Fabrication 35 3.1.6 Synthesis of monomers and polymers 36 3.2 Characterization Techniques 38 3.2.1. Ultraviolet-visible spectrophotometer 40 3.2.2 Field Emission Scanning Electron Microscopy 41 3.2.3 X-Ray Diffractometer 43 3.2.4 Measurements of Quantum Efficiency 44 3.2.5 Current-Voltage Characterization 46 3.2.6 AC-2 Measurement 47 3.2.7 Electrochemical impedance spectroscopy (EIS) 49 3.3 Basic parameters for evaluation of DSSC performance 50 3.4 Aim of This Thesis 54 CHAPTER FOUR IONIC LIQUID AS ELECTROLYTE SOLVENT 55 4.1.1 Device with Conventional Electrolytes 59 4.1.2 Device with AY2 Electrolytes 65 4.1.3 Device with Z959 Electrolytes 70 4.1.4 Stability of DSSC devices with different electrolytes 75 4.2 Synthesis of conducting polymer for HTM 84 4.2.1 Hole Transporting Polymer as Electrolytes 84 4.2.2 Synthesis of polymers 85 4.2.2 Optical properties of monomers and polymers 90 4.2.3 Device Fabrication and characterization 93 CHAPTER FIVE CONCLUSION 109 5.2 Future perspectives 110 APPENDIX 114 REFERENCES 122

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