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Dye-Sensitized Solar Cells based on Titanium Oxide(Ⅳ) Nanotube Arrays
티타니아 나노튜브 층이 도입된 염료감응형 태양전지

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dc.contributor.advisor서정쌍-
dc.contributor.author천명환-
dc.date.accessioned2017-10-27T17:15:58Z-
dc.date.available2017-10-27T17:15:58Z-
dc.date.issued2017-08-
dc.identifier.other000000145508-
dc.identifier.urihttps://hdl.handle.net/10371/137189-
dc.description학위논문 (박사)-- 서울대학교 대학원 자연과학대학 화학부, 2017. 8. 서정쌍.-
dc.description.abstractWe prepared dye-sensitized solar cells (DSSCs) with enhanced energy conversion efficiency using open-ended TiO2 nanotube arrays with a TiO2 scattering layer. As compared to closed-ended TiO2 nanotube arrays, the energy conversion efficiency of the open-ended TiO2 nanotube arrays was increased from 5.63% to 5.92%, which is an enhancement of 5.15%. With the TiO2 scattering layer, the energy conversion efficiency was increased from 5.92% to 6.53%, which is an enhancement of 10.30%. After treating the open-ended TiO2 nanotube arrays with TiCl4, the energy conversion efficiency was increased from 5.92% to 6.89%, a 16.38% enhancement, which is attributed to improved light harvesting and increased dye adsorption.

Dye-sensitized solar cells (DSSCs) were fabricated using open-ended freestanding TiO2 nanotube arrays functionalized with Ag nanoparticles (NPs) in the channel to create a plasmonic effect, and then coated with large TiO2 NPs to create a scattering effect in order to improve energy conversion efficiency. Compared to closed-ended freestandung TiO2 nanotube array-based DSSCs without Ag or large TiO2 NPs, the energy conversion efficiency of closed-ended DSSCs improved by 9.21%(actual efficiency, from 5.86% to 6.40%) with Ag NPs, 6.48%(actual efficiency, from 5.86% to 6.24%) with TiO2 NPs, and 14.50%(actual efficiency, from 5.86% to 6.71%) with both Ag NPs and TiO2 NPs. By introducing Ag NPs and/or large TiO2 NPs to open-ended freestanding TiO2 nanotube array-based DSSCs, the energy conversion efficiency was improved by 9.15%(actual efficiency, from 6.12% to 6.68%) with Ag NPs and 8.17%(actual efficiency, from 6.12% to 6.62%) with TiO2 NPs, and by 15.20%(actual efficiency, from 6.12% to 7.05%) with both Ag NPs and TiO2 NPs. Moreover, compared to closed-ended freestanding TiO2 nanotube arrays, the energy conversion efficiency of open-ended freestanding TiO2 nanotube arrays increased from 6.71% to 7.05%. We demonstrate that each component—Ag NPs, TiO2 NPs and open-ended freestanding TiO2 nanotube arrays—enhanced the energy conversion efficiency, and the use of a combination of all components in DSSCs resulted in the highest energy conversion efficiency.
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dc.description.tableofcontentsChapter 1. Introduction 1
1.1. Anodization 2
1.1.1. Titanium(Ti) anodization 2
1.1.2. Chemical reaction of Titanium anodization 6
1.1.3. Formation of Titanium oxide nanotubes 10
1.1.4. Anodization condition and annealing 12
1.2. Dye Sensitized Solar Cell 14
1.2.1. Overview 14
1.2.2. Components of DSSCs 15
1.2.2.1. Semiconductor 15
1.2.2.2. Dye 16
1.2.2.3. Electrolyte 17
1.2.2.4. Counter Electrode 18
1.2.3. Basic Operation Principle 19
1.2.3.1. Excitation 21
1.2.3.2. Injection 21
1.2.3.3. Diffusion in TiO2 22
1.2.3.4. Iodine Reduction 22
1.2.3.5. Dye Regeneration 22
1.2.4. Solar Cell Terminologies 24
1.2.4.1. Equivalent circuit of solar cells 24
1.2.4.2. Short-circuit Current 26
1.2.4.3. Open-circuit Voltage 26
1.2.4.4. Series Resistance 27
1.2.4.5. Shunt Resistance 289
1.2.4.6. Fill Factor 29
1.2.4.7. Efficiency 30
1.2.4.8. Quantum Efficiency 30
1.3 Additional strategies to enhance the efficiency of DSSCs 32
1.3.1. Blocking Layer 32
1.3.2. TiCl4 treatment 33
1.3.3. Light Scattering Layer 34
1.4. Plasmonic DSSCs 35
1.4.1. Surface plasmon resonance for solar cells 35
1.4.2. Localized surface plasmon resonance 38
1.4.3. Plasmonic effect in solar cells 39
Chapter 2 Experimental Section 42
2. 1. Preparation of TiO2 nanotubes arrays 43
2. 1. 1. Materials 43
2. 1. 2. Titanium (Ti) Anodization 44
2. 1. 3. Preparation of free-standing crystallized TiO2 nanotubes 45
2. 1. 4. Preparation of free-standing crystallized TiO2 nanotube arrays 45
2. 2. Fabrication of dye-sensitized solar cells based on TiO2 nanotubes array with scattering layer 46
2. 2. 1. Overview of DSSCs manufacturing 46
2. 2. 2. Preparation of blocking layer 47
2. 2. 3. Introduction to TiO2 nanotubes arrays on FTO glass 47
2. 2. 4 Adapting scattering layer 48
2. 2. 5. TiCl4 treatment 48
2. 2. 6. Dye absorption 48
2. 2. 7. Electrolyte 49
2. 2. 8. Counter electrode 49
2. 2. 9. Fabrication of DSSCs 49
2. 3. Fabrication of DSSCs with freestanding TiO2 nanotube arrays with channels containing Ag NPs 50
2. 3. 1. Same the former process of free standing TiO2 nanotube arrays with scattering layer 50
2. 3. 2. Ag nanoparticle formation 50
2. 3. 3. Same the latter process of free standing TiO2 nanotube arrays with scattering layer 50
2. 4. Characterization 51
2. 4. 1. FE-SEM 51
2. 4. 2. TEM 51
2. 4. 3. Solar simulator 52
2. 4. 4. Incident photon-to-current conversion efficiency (IPCE) 52
Chapter 3 Improved energy conversion efficiency of dye-sensitized solar cells fabricated using open-eneded TiO2 nanotube arrays with scattering layer 54
3. 1 Overall view of free standing TiO2 nanotube arrays DSSCs 55
3. 2. Characteristics of closed- and open-ended TiO2 nanotube arrays 57
3. 3 Performance Measurements of the DSSCs which have closed- /open-ended TiO2 nanotube arrays with the TiO2 scattering layer 61
3. 4. Conclusions 68
Chapter 4 Ag nanoparticle-functionalized open-ended freestanding TiO2 nanotube arrays with scattering layer for improved energy conversion efficiency in dye-sensitized solar cells 70
4. 1. Overall view of Ag nanoparticle-functionalized open-ended freestanding TiO2 nanotube arrays with scattering layer for improved energy conversion efficiency in dye-sensitized solar cells 71
4. 2. Results and discussion 74
4. 2. 1 Overall scheme of DSSCs with freestanding TiO2 nanotube arrays with channels containing Ag NPs 74
4. 2. 2 Characterization of freestanding TiO2 nanotube arrays with channels containing Ag NPs 76
4. 2. 3. DSSCs with closed-ended freestanding TiO2 nanotube arrays with channels containing Ag NPs and large TiO2 NPs 80
4. 2. 4. DSSCs with open-ended freestanding TiO2 nanotube arrays with channels containing Ag NPs and large TiO2 NPs 83
4. 3. Conclusions 86
Chapter 5 Dual Functionalized Freestanding TiO2 Nanotube Arrays Coated with Ag Nanoparticles and Carbon Materials for Dye-Sensitized Solar Cells 89
5. 1. Overall view of dual functionalized freestanding TiO2 Nanotube arrays Coated with Ag Nanoparticles and Carbon Materials for Dye-Sensitized Solar Cells 90
5. 2. Materials and Methods 94
5. 2. 1. Preparation of closed- and open-ended TiO2 NTAs 94
5. 2. 2. Preparation of photoanodes for DSSCs based on the TiO2 NTAs 94
5. 2. 3. Synthesis of Ag NPs on the TiO2 NTAs by UV irradiation 95
5. 2. 4. Synthesis of carbon materials by CVD on TiO2 NTAs 95
5. 2. 5. Fabrication of due-sensitized solar cells 95
5. 2. 6. Characterization of dye-sensitized solar cells 96
5. 3. Results and Discussion 98
5. 4. Conclusions 116
References 118
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dc.formatapplication/pdf-
dc.format.extent2008429 bytes-
dc.format.mediumapplication/pdf-
dc.language.isoen-
dc.publisher서울대학교 대학원-
dc.subjectopen-ended freestanding TiO2 nanotube arrays-
dc.subjectdye-sensitized solar cells-
dc.subjectplasmonic-
dc.subjectscattering-
dc.subjectanodization-
dc.subject.ddc540-
dc.titleDye-Sensitized Solar Cells based on Titanium Oxide(Ⅳ) Nanotube Arrays-
dc.title.alternative티타니아 나노튜브 층이 도입된 염료감응형 태양전지-
dc.typeThesis-
dc.contributor.AlternativeAuthorChun, Myoungwhan-
dc.description.degreeDoctor-
dc.contributor.affiliation자연과학대학 화학부-
dc.date.awarded2017-08-
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College of Natural Sciences (자연과학대학)Dept. of Chemistry (화학부)Theses (Ph.D. / Sc.D._화학부)
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