Optimization of Nanostructured Metal Oxide for Solar Energy Harvesting
Optimization of Nanostructured Metal Oxide for Solar Energy Harvesting
- 주제(키워드) Solar Energy Harvesting
- 발행기관 아주대학교
- 지도교수 서형탁
- 발행년도 2020
- 학위수여년월 2020. 2
- 학위명 박사
- 학과 및 전공 일반대학원 에너지시스템학과
- 실제URI http://www.dcollection.net/handler/ajou/000000029717
- 본문언어 영어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
As human energy demand and consumption increases globally, the problem of environmental pollution caused by the use of traditional fossil fuels is becoming serious. To address this issue, researchers around the world are focusing on developing clean, sustainable and renewable energy. Among many alternative energy sources, renewable energy using solar energy is a uniformly distributed energy source in the world and is regarded as a very clean energy without being consumed. The technology for utilizing the solar energy has been studied to convert not only electricity, but also to chemical fuel materials such as hydrocarbons and hydrogen. In particular, the most researched fields are solar cells and photoelectrochemical water splitting technology. However, although two technologies have been studied for a long time since 1954 and 1972, respectively, they are still in need of improvement in terms of efficiency and stability to be commercially available. Various structures and materials have been tried to improve this, and considerable research is still needed. In this study, metal oxides were fabricated into nanostructures and applied to solar cells and photoelectrochemical cells, and the solar conversion efficiency were effectively increased by optimizing each application using strategies such as heterojunction and doping. In addition, the electronic band structure was investigated through various spectroscopic (including X-ray photoelectron spectroscopy and ultraviolet-visible spectroscopy) and electronic analysis, and the mechanism for increasing the efficiency of the nanostructured cell was analyzed. Through this mechanism analysis, we have proposed general guidelines that can be applied to various oxide materials for effectively increasing efficiency.
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Table of Contents
Page No.
List of Figures IV
1. Introduction １
2. Research background ４
2.1. Electronic band structure ４
2.2. TiO2 photocatalyst and photoelectrochemical water splitting ６
2.3. MoOx for photoelectrochemical water splitting ８
2.4. ZnO/Cu2O solar cells １０
3. Improving efficient photocatalytic properties of TiO2 nanostructure via defect engineering using hydrogen and fluorine double doping １２
3.1. Introduction １２
3.2. Experimental Procedure １４
3.2.1. Preparation of metal nanoparticle loaded TiO2 nanoparticle and its double doping of hydrogen and fluorine １４
3.2.2. Preparation of Pd nanoparticle loaded TiO2 nanorod and its double doping of hydrogen and fluorine １５
3.2.3. Plasma-assisted double doping process of hydrogen and fluorine in TiO2 nanorod １６
3.2.4. Characterization of TiO2 nanostructures １６
3.3. Results and Discussion １８
3.3.1. Photocatalytic characterization of metal nanoparticle loaded double doped TiO2 nanoparticle １８
3.3.2. Photoelectrochemical characterization of Pd nanoparticle loaded double doped TiO2 nanorod ３１
3.3.3. Photoelectrochemical characterization of plasma-assisted double-doped TiO2 nanorod ３５
3.4. Conclusion ３９
4. Nonstoichiometric Molybdenum Oxide / p-Si Heterojunction Photocathode for Hydrogen Evolution ４０
4.1. Introduction ４０
4.2. Experimental Procedure ４４
4.3. Results and Discussion ４６
4.4. Conclusion ６２
5. Uniform ZnO nanorod/Cu2O core–shell structured solar cells ６３
5.1. Introduction ６３
5.2. Experimental Procedure ６５
5.3. Results and Discussion ６７
5.4. Conclusion ７６
6. Plasmon-enhanced ZnO nanorod/Au NPs/Cu2O structure solar cells ７７
6.1. Introduction ７７
6.2. Experimental Procedure ７９
6.3. Results and Discussion ８０
6.4. Conclusion ９２
7. Conclusion and Future Work ９３
Bibliography ９４
