Preparation and Characterization of Electrospun Nanofibers for Dye-sensitized Solar Cells
- Issued Date
- 2012
- Abstract
- A solar cells are dealt to overcome the future energy and environmental problems. Solar cell as an alternative energy source is electricity generator changing from sun light to electricity directly by photovoltaic effect. Compared to silicon solar cell, dye-sensitized solar cells (DSSC) have been much attention from industrial fields because of the high energy conversion efficiency and low fabrication cost. For the enhancement of energy conversion efficiency, many researchers have been studied on the nanocrystalline TiO2 electrode, dye development, electrolyte, electron diffusion, sealing technology and conductivity substrate.
In this study, various TiO2 electrode was developed and the energy conversion efficiency was evaluated to increase the photovoltaic conversion efficiency. Nanocrystalline TiO2 particles as a key part in DSSC were synthesized by typical sol-gel method. The synthesized TiO2 particles are single-phase anatase nanocrystallites and have particle size of the 15 nm. The prepared TiO2 electrode including commercial P25-TiO2 electrode were characterized by BET, FE-SEM, FT-IR, XPS, and XRD analysis. It was found that DSSC made of TiO2 electrode as photo-anodes achieved better photo-energy conversion efficiency compared to those prepared using commercially available P25-TiO2 electrode. The influences of adsorption properties on the energy conversion efficiency of DSSC are also investigated. To this end, adsorption equilibrium and kinetics of N719 dye on the TiO2 electrode were investigated.
To improve the photovoltaic conversion efficiency, metal oxides have been used for the reduction of electron recombination losses at TiO2/dye/electrolyte interface. In this study, the energy conversion efficiency of TiO2 photo electrodes adding electrospun TiO2 and Al2O3 nanofibers were investigated. The electrospun samples were characterized by BET, SEM, XRD, FT-IR and TGA analysis. To improve the short-circuit photocurrent, TiO2 nanoparticle paste with different mixing ratio of additives (i.e., electrospun TiO2 and Al2O3 nanofibers) was prepared and applied for the evaluation of DSSC performance. The conversion efficiencies of TiO2 photo electrode with TiO2 and Al2O3 nanofibers were increased up to 15 % and 20 %, respectively, compared to TiO2 photoelectrode without nonofiber additives. This result may come from the fact that the adsorption amount of dye molecule and the diffusion coefficient of I3- for TiO2 photoelectrode including additives of TiO2 and Al2O3 nanofibers were higher and faster than those of TiO2 photoelectrode prepared by sol-gel method.
- Alternative Title
- 염료감응태양전지용 전기방사 나노파이버의 제조
- Alternative Author(s)
- Yang, Cheong Suk
- Department
- 일반대학원 화학공학과
- Advisor
- 김선일
- Awarded Date
- 2013-02
- Table Of Contents
- List of Tables ⅳ
List of Figures ⅴ
Abstract in Korea ⅹ
Chapter Ⅰ. Introduction 1
1.1 Research Background 1
1.1.1 Synthesis of TiO2 by Sol-gel Method 4
1.1.2 Electrospinning 7
1.1.3 Dye-sensitized Solar Cells 12
1.2 Objective 16
1.3 Overview 19
Chaper Ⅱ. Theoretical Background of Dye-sensitized Solar Cells 20
2.1 Working Principle of Dye-Sensitized Solar Cells 20
2.2 Photovoltaic Energy Conversion 24
2.2.1 The Solar Spectrum 24
2.2.2 Air Mass 25
2.2.3 Basic Parameters of Solar Cell Performance 27
2.3 Panchromatic Sensitizers 32
2.3.1 Light Absorption via MLCT Excitation 32
2.3.2 Dye Molecule Sensitizers 33
2.4 Interfacial Principle of DSSCs 38
2.4.1 Interfacial Kinetics 38
2.4.2 Charge Transport 39
2.4.3 Charge Recombination 43
Chapter Ⅲ. Experimental Procedure 45
3.1 Preparation of Materials for DSSC 45
3.1.1 TiO2 Particle by Sol-gel Method 45
3.1.2 Electrospun TiO2 Nanofibers 48
3.1.3 Electrospun Al2O3 Nanofibers 50
3.2 Preparation and Measurement of DSSCs 54
3.2.1 Preparation of DSSCs 54
3.2.2 Measurement of DSSCs 67
Chapter Ⅳ. Results and Discussion 69
4.1 Materials 69
4.1.1 TiO2 Particles by Sol-gel Method 69
4.1.2 Electrospun TiO2 Nanofibers 76
4.1.3 Electrospun Al2O3 Nanofibers 80
4.2 Photoelectricity for DSSC Performance 94
4.2.1 TiO2 Particle Photoelectrode 94
4.2.2 TiO2 Nanofiber Doped TiO2 Particle Electrode 105
4.2.3 Al2O3 Nanofiber Doped TiO2 Particle Electrode 107
Chapter Ⅴ. Conclusions 115
References 118
Abstract in English 125
- Degree
- Doctor
- Publisher
- 조선대학교 대학원
- Citation
- 양청석. (2012). Preparation and Characterization of Electrospun Nanofibers for Dye-sensitized Solar Cells.
- Type
- Dissertation
- URI
- https://oak.chosun.ac.kr/handle/2020.oak/9664
http://chosun.dcollection.net/common/orgView/200000263550
- Appears in Collections:
- General Graduate School > 4. Theses(Ph.D)
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