Catalyst-Free Growth of ZnO Nanowires and Its Application for Dye-Sensitized Solar Cells

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研究生：	蕭景倫 Hsiao, Ching-Lun
論文名稱：	Catalyst-Free Growth of ZnO Nanowires and Its Application for Dye-Sensitized Solar Cells 無催化劑成長氧化鋅奈米線及其於染料敏化太陽能電池之應用
指導教授：	林鶴南 Lin, Heh-Nan
口試委員:
學位類別：	碩士 Master
系所名稱：	工學院 - 材料科學工程學系 Materials Science and Engineering
論文出版年：	2009
畢業學年度：	97
語文別：	英文
論文頁數：	73
中文關鍵詞：	氧化鋅、染料敏化太陽能電池
相關次數：	點閱：92 下載：0
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In recent years, much attention has been paid to the development of dye-sensitized solar cells (DSCs) because of their low production cost. In this study, growth of well-aligned single-crystalline ZnO nanowires (NWs) is realized on bare transparent conductive oxide (TCO) glass substrates by one-step thermal evaporation. The highest obtained roughness factor, conversion efficiency and fill factor are around 20, 1.33% and 0.52, respectively. When compared with the reported values from the ZnO photoanodes fabricated via low-temperature process, the achieved fill factor of 0.52 stands relatively high due to the superior crystallinity and the better electron transport pathway of the nanowires fabricated by the high temperature process. With further improvement on the roughness factor, it is foreseeable that the conversion efficiency can be improved by our lately synthesized ultra-long ZnO NWs (around 80 □m in length) and may reach a useful level.

誌謝    1
摘要    2
Abstract    3
Table of Contents    4
List of Figures    7
List of Tables    10
Chapter 1 : Introduction    11
1 Category of Solar Cells    11
1.1 Silicon Solar Cells    11
1.2 Thin Film Solar Cells    12
1.3 Dye-Sensitized Solar Cells    15
2 Nanostructured Semiconductors as Photoanodes of DSCs    18
3 Motivation    20
Chapter 2 : Photovoltaic Technology    22
1 Basics of Solar Energy Conversion    22
1.1 Photovoltaic Cell Performance    22
1.2 Parasitic Resistance    23
2 Dye-Sensitized Solar Cells    26
2.1 Operation Principle of DSCs    26
2.2 Light Absorption    30
2.3 Charge Separation    31
2.4 Electron Transport in the Semiconductor Anode    32
2.5 Ion Transport in the Redox Electrolyte    33
2.6 Interfacial Kinetics    34
Chapter 3 : Literature Review on NW Growth and ZnO Photoanodes    36
1 Vapor-Liquid-Solid and Vapor-Solid Growths of NWs    36
1.1 Catalyst-Assisted Vapor-Liquid-Solid (VLS) Mechanism    36
1.2 Vapor-Solid (VS) Mechanism    38
1.3 Catalyst-Free Surface-Roughness-Assisted Growth    39
2.1 ZnO NWs as Photoanodes of DSCs    43
2.2 ZnO Nanoflowers as Photoanodes of DSCs    45
2.3 ZnO-TiO2 Core-Shell as Photoanodes of DSCs    46
2.4 Branched ZnO NWs as Photoanodes of DSCs    48
Chapter 4 : Experimental Procedures and Instruments    50
1 Experimental Instruments    50
2 Experimental Procedures    53
2.1 Growth of ZnO NWs on TCO Substrates    53
2.2 Assembling Process of DSCs    54
2.3 Efficiency Measurement for DSCs    55
Chapter 5 : Results and Discussion    57
1 SEM Analysis of ZnO NWs    57
2 AFM Analysis of TCO Glass Substrates    59
3 TEM Analysis of ZnO NWs    62
4 Effect of Dye Immersion Time    63
5 Calculation of Roughness Factors    65
6 Efficiency Measurement of DSCs    66
Chapter 6 : Conclusions    70
1 Summary    70
2 Future Works    71
References    72

                                

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