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Designing Transparent Electrodes Materials Toward Broadband Light Trapping

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dc.contributor.advisor박병우-
dc.contributor.author이우진-
dc.date.accessioned2017-07-13T05:47:44Z-
dc.date.available2017-07-13T05:47:44Z-
dc.date.issued2015-08-
dc.identifier.other000000067231-
dc.identifier.urihttps://hdl.handle.net/10371/118026-
dc.description학위논문 (박사)-- 서울대학교 대학원 : 재료공학부, 2015. 8. 박병우.-
dc.description.abstractTransparent conducting oxides (TCOs) have been used for various
optoelectronic applications, such as flat-panel displays and thin-film solar cells.
Especially for a-Si thin-films solar cells, light-scattering capability of TCOs via
surface texturing is one of the most important characteristics due to effective
scattering enhances power-conversion efficiency. Among various TCOs, ZnO:Al
has received strong attention because of its larger feature size by wet-chemical
etching. Basically, textured morphology by wet etching depends on the
nanostructure of TCOs due to the anisotropy of etching rates. However,
nanostructural control of TCOs in mass manufacturing is pretty limited with
consideration of electrical conductivity and high throughput. Therefore, surface
texturing by simple etching for the given TCO nanostructures offers a great merit
for the strategy of TCO development.
In this thesis, the novel etching system by organic acid for the surface-textured
ZnO:Al films is investigated. The Chap. 1 describes the general scientific context
and the research field in which this thesis is included. First, a brief overview of
the photovoltaic technologies and the current issues of the Si thin-film solar cells.
Second, the TCOs are introduced and their use as a front electrode in Si thin-film
solar cells is explained. Finally, the motivation and objectives of this work are
summarized.
In Chap. 2, an organic acid for the surface texturing of ZnO:Al is introduced
as an alternative to conventional HCl. The texturing behavior by oxalic acid is
investigated in terms of vertical roughness, lateral correlation length, and thickness
change according to the crater evolution. Etching with oxalic acid results in
superior light-scattering performance (by ~8% increase at λ = 1000 nm) with
maintaining transparency and resistance, compared to etching with HCl. This
fascinating behavior is understood by crater evolution with the difference in relative
etching rates. Significantly, this simple and reproducible texturing tactic extends
tunability for desirable TCO morphology, enabling efficient light trapping, and
therefore appears potentially applicable for large-scale photovoltaic devices in
industry. Lastly, all results and conclusion of the thesis are summarized in Chap.
3.
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dc.description.tableofcontentsAbstract i
List of Figures v
List of Table xiv
Chapter 1. Overview 1
1.1. General Introduction to Solar Cells 1
1.1.1. Basic Operation Principle of the Solar Cells 1
1.1.2. Classification of Solar Cells 7
1.2. Si Thin Film Solar Cells 11
1.2.1. Introduction of the Si Thin Film Solar Cells 11
1.2.2. Light Management Technology in Si Thin Film Solar Cells 13
1.3. Overview of Transparent Conducting Oxide in Si Thin Film Solar Cells 17
1.3.1. The Factors determining Textured Morphology 21
1.3.2. The Wet-Chemical Etching of ZnO:Al Films 27
1.4. References 39
Chapter 2. Organic-Acid Texturing of ZnO:Al Toward Broadband Light Scattering for Si
Thin-Film Solar Cells 44
2.1. Introduction 44
2.2. Experimental Section 46
2.3. Results and Discussion 46
2.4. Conclusions 68
2.5. References 69
Chapter 3. Summary 73
Appendix
A. 1. Facile Conversion Synthesis of Densely-Formed Branched ZnO Nanowire Arrays for
Quantum-Dot-Sensitized Solar Cells 74
A.1.1. Introduction 74
A.1.2. Experimental Section 76
A.1.2.1. Synthesis of 1-D Nanostructures 76
A.1.2.2. Branched ZnO Nanowire Growth 77
A.1.2.3. Device Fabrication 77
A.1.2.4. Characterization 78
A.1.3. Results and Discussion 79
A.1.4. Conclusions 101
A.1.5. References 102
A. 2. List of Publications and Presentations 109
A.3.1. Publications (International) 109
A.3.2. Presentation (International) 113
A.3.3. Presentation (Domestic) 113
국문 초록 114
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dc.formatapplication/pdf-
dc.format.extent4979676 bytes-
dc.format.mediumapplication/pdf-
dc.language.isoen-
dc.publisher서울대학교 대학원-
dc.subject투명전극-
dc.subject광 산란-
dc.subject박막 태양전지-
dc.subject아연 산화물-
dc.subject표면 텍스쳐링-
dc.subject.ddc620-
dc.titleDesigning Transparent Electrodes Materials Toward Broadband Light Trapping-
dc.typeThesis-
dc.description.degreeDoctor-
dc.citation.pagesxiv, 114-
dc.contributor.affiliation공과대학 재료공학부-
dc.date.awarded2015-08-
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