49 research outputs found
μ κΈ°ννμ μ©ν΄ λ°©λ²μ ν΅ν λλ Έλ€κ³΅μ± λ°±κΈ λ°λ§ μ μ
Thesis(masters) --μμΈλνκ΅ λνμ :μ¬λ£κ³΅νλΆ, 2009.2.Maste
κ΄μ κ·Ήμ λλ Έκ΅¬μ‘° λ³νλ₯Ό ν΅ν μΌλ£κ°μννμμ μ§ ν¨μ¨ ν₯μ
νμλ
Όλ¬Έ (λ°μ¬)-- μμΈλνκ΅ λνμ : μ¬λ£κ³΅νλΆ, 2013. 8. λ°λ³μ°.Dye-sensitized solar cell (DSSC) is an effective photoelectrochemical system that exhibits power-conversion efficiency over 10%. However, materials and systems of DSSC are almost optimized, so efficiency of device has been in stagnancy without a breakthrough for about 10 years. In addition, development of advanced technology is definitely needed for the mass production of device and thereby for the commercialization of DSSC. With these necessities, novel approaches have been attempted both in the research area and in the industrial area.
The main objective of my thesis is to develop novel photoelectrode materials for DSSC. To achieve the goal, I introduced the metal-induced nanostructures into the semiconducting TiO2 film, so optical and nanostructural properties of photoelectrodes were manipulated. Unique optical properties of metal nanoparticles are utilized to enhance light absorption in photoelectrode and to improve the conversion efficiency of solar-cell device. Deposition of metal/semiconductor nanocomposites and subsequent selective etching of metal were conducted to obtain nanoporous thin-film photoelectrode. Optical and nanostructural properties of photoelectrodes were thoroughly investigated, and correlations to the photochemical properties of DSSCs were also made.
In Chapter 1, dye-sensitized solar cell (DSSC) is briefly reviewed. Operating principle, components, and materials for DSSC are explained. Particularly, various nanostructures for the photoelectrode of DSSC are introduced. Surface-plasmon resonance in metal nanostructures is also concerned in this chapter, as a new strategy to improve light absorption and solar-cell properties.
In Chapter 2, gold nanoparticles of ~100 nm in diameter were incorporated into TiO2 nanoparticles for dye-sensitized solar cells (DSSCs). At the optimum Au/TiO2 mass ratio of 0.05, the power-conversion efficiency of the DSSC improved to 3.3% from a value of 2.7% without Au, and this improvement was mainly attributed to the photocurrent density. The Au nanoparticles embedded in the nanoparticulate-TiO2 film strongly absorbed light due to the localized surface-plasmon resonance, and thereby promoted light absorption of the dye. In the DSSCs, the 100 nm-diameter Au nanoparticles generate field enhancement by surface-plasmon resonance rather than prolonged optical paths by light scattering.
In Chapter 3, a facile method to synthesize nanoporous-TiO2 thin film for dye-sensitized solar cell (DSSC) was introduced. Silver/TiO2 co-sputtering led to the formation of nanocomposite film which consists of silver nanoclusters and surrounding TiO2 matrix, and subsequently, Ag nanoclusters in nanocomposite were selectively etched by just immersing in nitric acid. Nanoporous-TiO2 DSSC fabricated by this simple and straightforward process showed the power-conversion efficiency of 3.4% under 1 sun condition, at the thickness of only 1.8 ΞΌm.μΌλ£κ°μν νμμ μ§λ 10% μ΄μμ κ΄μ λ³νν¨μ¨μ λνλ΄λ ν¨μ¨μ μΈ κ΄μ κΈ°ννμμ€ν
μ΄μ§λ§, μ§λ 20μ¬λ
κ°μ μ°κ΅¬λ₯Ό ν΅ν΄ μ¬λ£ λ° μμμ μκΈ°μ μ΄ μ΅μ νλμ΄ μμμ ν¨μ¨μ νκ³μ μ λ€λ€λ₯Έ μνμ΄λ€. μΌλ£κ°μν νμμ μ§μ μ°μ
ν λ° μμ©νλ₯Ό μν΄μλ μμμ κ΄μ λ³νν¨μ¨ ν₯μ λΏλ§ μλλΌ λλμμ°μ μν μ°¨μΈλ 곡μ κ°λ°μ΄ νμνλ©°, μ΄λ₯Ό μν΄ μ¬λ£β’ννβ’물리 λ± λ€μν λΆμΌμμ μ¬λκΉμ μ°κ΅¬κ° μ§νλκ³ μλ€.
λ³Έ νμλ
Όλ¬Έμ, μΌλ£κ°μν νμμ μ§ κ΄μ κ·Ήμ λλ
Έκ΅¬μ‘°λ₯Ό μ‘°μ νμ¬ μμμ κ΄μ λ³νν¨μ¨μ ν₯μμν¨ μ°κ΅¬ λ΄μ©μ λνμ¬ λ³΄κ³ νκ³ μλ€. κΈμλλ
Έκ΅¬μ‘°μμ λ°μνλ νλ©΄νλΌμ¦λͺ¬νμμ μ μ©νμ¬ κ΄μ κ·Ήμ κ΄νμ νΉμ±μ μ‘°μ νκ³ μ΄λ₯Ό ν΅ν μμμ κ΄ν‘μβ’κ΄μ λ₯ λ³νλ₯Ό κ΄μ°°νμμΌλ©°, μ€νΌν°λ§μ¦μ°© λ° μ νμ μ©ν΄ λ°©λ²μ ν΅ν΄ μΌλ£κ°μν νμμ μ§ κ΄μ κ·Ήμ© λλ
Έλ€κ³΅μ± μ΄μ°νν°νλ λ°λ§μ μ μνλ μλ‘μ΄ κ³΅μ μ μ μνμλ€. λν κ΄μ κ·Ήμ κ΄νμ /λλ
Έκ΅¬μ‘°μ νΉμ±κ³Ό νμμ μ§μ κ΄λ³ννΉμ± μ¬μ΄μ μκ΄κ΄κ³μ λν΄μλ λ©΄λ°νκ² λΆμνμλ€.
λ³Έ νμλ
Όλ¬Έμ 1μ₯μ μΌλ£κ°μν νμμ μ§μ λν μκ°λ‘ μμνκ³ μλ€. μΌλ£κ°μν νμμ μ§μ μλ μ리, κ΅¬μ± μμ, κ·Έλ¦¬κ³ μ¬μ©λλ μ¬λ£μ λν μ€λͺ
μ΄ μλ‘λμ΄ μμΌλ©°, νΉν κ΄μ κ·Ή μ¬λ£λ‘ μ¬μ©λλ μ°νλ¬Όλλ
Έκ΅¬μ‘°μ λν λ€μν μ νμ°κ΅¬μ λν΄ μμΈν μ€λͺ
νκ³ μλ€. λν κΈμλλ
Έκ΅¬μ‘°μμ λ°μνλ νλ©΄νλΌμ¦λͺ¬ νμ λ° μ΄λ₯Ό μ΄μ©ν νμμ μ§μ κ΄ν‘μ λ° κ΄μ λ₯ ν₯μ κ°λ₯μ±μ λν΄μλ μ€λͺ
νκ³ μλ€.
2μ₯μμλ, μ΄μ°νν°νλ λλ
Έμ
μκ΄μ κ·Ήμ 100 λλ
Έλ―Έν° ν¬κΈ°μ κΈ λλ
Έμ
μλ₯Ό 첨κ°ν μ°κ΅¬ κ²°κ³Όμ λν΄ λ³΄κ³ νκ³ μλ€. μ΅μ 쑰건μμ κ΄μ λ³νν¨μ¨μ 2.7%μμ 3.3%λ‘ ν₯μλμμΌλ©°, κ΄μ λ₯ ν₯μμ΄ μμμ ν¨μ¨ ν₯μμΌλ‘ μ΄μ΄μ‘λ€. κ΄ν‘μ μΈ‘μ μ ν΅ν΄, κ΄μ κ·Ή λ΄λΆμ κΈ λλ
Έμ
μλ νλ©΄νλΌμ¦λͺ¬μ ν΅ν΄ λΉμ κ°νκ² ν‘μνκ³ μμμ κ΄ν‘μλ₯Ό μ¦κ°μν¨λ€λ κ²μ νμΈνμμΌλ©°, νλ©΄νλΌμ¦λͺ¬μ μν΄ κΈ λλ
Έμ
μ μ£Όλ³μμ μ κΈ°μ₯μ μΈκΈ°κ° κ°ν΄μ Έ λΉμ΄ μ§μ€λκ³ μ΄λ‘ μΈν΄ κ΄μ λ₯ μμ±μ΄ ν₯μλλ€λ λ©μ»€λμ¦μ μ μνμλ€.
3μ₯μμλ μ€νΌν°λ§μ¦μ°© λ° μ νμ μ©ν΄λ₯Ό ν΅ν΄ λλ
Έλ€κ³΅μ± λ°λ§μ μ μν μ°κ΅¬ κ²°κ³Όμ λν΄ λ³΄κ³ νκ³ μλ€. μ€νΌν°λ§ λ°©λ²μ ν΅ν΄ μκ³Ό μ΄μ°νν°νλμ λμμ¦μ°©νλ©΄, μ λλ
Έν΄λ¬μ€ν°μ μ΄λ₯Ό λλ¬μΌ μ΄μ°νν°νλ 맀νΈλ¦μ€λ‘ ꡬμ±λ λλ
Έλ³΅ν©μ²΄ λ°λ§μ΄ λ§λ€μ΄μ§κ³ , μ΄ λ°λ§μ μ§μ°μ λ΄κ° μμ μ νμ μΌλ‘ λ
Ήμ¬λ΄λ©΄ λλ
Έλ€κ³΅μ± μ΄μ°νν°νλ λ°λ§μ΄ λ§λ€μ΄μ§λ€. μ΄λ κ² λ§λ€μ΄μ§ λλ
Έλ€κ³΅μ± μ΄μ°νν°νλ λ°λ§μ μΌλ£κ°μν νμμ μ§ κ΄μ κ·ΉμΌλ‘ μ μ©νμ λ, 1.8 ΞΌmμ μμ λκ»μμ μ°μν κ΄μ λ³νν¨μ¨ 3.4%κ° λ³΄κ³ λμλ€.Abstract i
List of Figures vi
List of Table xiii
Chapter 1. Overview 1
1.1. Introduction to Dye-Sensitized Solar Cells 1
1.2. Materials in Dye-Sensitized Solar Cells 5
1.3. Nanostructured Photoelectrodes 10
1.4. Surface-Plasmon Resonance in Metal Nanostructures 15
1.5. Objective of Research 22
1.6. References 25
Chapter 2. The Effects of 100 nm-Diameter Au nanoparticles on
Dye-Sensitized Solar Cells 28
2.1. Introduction 28
2.2. Experimental Section 30
2.3. Results and Discussion 33
2.4. Conclusions 47
2.5. References 48
Chapter 3. A Simple Template-Free
'Sputtering Deposition and Selective Etching' Process for
Nanoporous Thin Films and
Its Application to Dye-Sensitized Solar Cell 54
3.1. Introduction 54
3.2. Experimental Section 59
3.3. Results and Discussion 62
3.4. Conclusions 80
3.5. References 81
Appendix 88
A.1. Publications 88
A.2. Presentations 91
κ΅λ¬Έ μ΄λ‘ 94Docto
μΉκΈ°λ° μμ μμ νμ΅μμ λμΈμ§λ₯κ³Ό νΌλλ°± μ μμ νμ΄ λμΈκ° μνΈμμ©μ λ―ΈμΉλ ν¨κ³Ό
νμλ
Όλ¬Έ(μμ¬)--μμΈλνκ΅ λνμ :κ΅μ‘νκ³Ό κ΅μ‘곡νμ 곡,2001.Maste
Preparation of antimicrobial fibers using water-soluble chitosan derivatives
νμλ
Όλ¬Έ(λ°μ¬)--μμΈλνκ΅ λνμ :μ¬μ κ³ λΆμ곡νκ³Ό,2000.Docto
ε ι»ε εε ζ³μ ο§η¨ν 2ζε η‘η§©εΊ εο€μ ι»ε ζ§ι η‘η©Ά
Thesis (doctoral)--μμΈλνκ΅ λνμ :물리νκ³Ό,1995.Docto
Bacterial adhesion onto fluoropolymer surfaces with the extremely low surface energy
νμλ
Όλ¬Έ(μμ¬)--μμΈλνκ΅ λνμ :ννμ물곡νλΆ,2007.Maste
νκ΅μ£Όμμμ₯μ κ±°μμμΈλͺ¨ν (Macro factor model)
νμλ
Όλ¬Έ(μμ¬)--μμΈλνκ΅ λνμ :κ²½μ νλΆ κ²½μ νμ 곡,2002.Maste