Large-area assembly and restructuring of multiscale multidimensional nanoparticle structures and their application to a solar cell
멀티스케일 다차원 나노입자 구조물 대면적 조립 및 재구조화 이의 태양전지 응용

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dc.description학위논문 (박사)-- 서울대학교 대학원 : 기계항공공학부, 2015. 2. 최만수.-
dc.description.abstractIn order to utilize unique and superior properties of nanomaterials in various fields including modern sciences and engineering, many researches for developing nanomaterials have been reported. In particular, multifunctional properties of multiscale multidimensional structures have attracted great interests for numerous applications such as photonics, sensors, and electronics. Therefore, fabrication methods of multiscale multidimensional structures have been continuously studied. As part of the effort, ion assisted aerosol lithography (IAAL) was introduced as a new technique for multiscale multidimensional assembly of nanoparticles. However, to extend applicability of multiscal multidimensional nanoparticle structures (NPSs) via IAAL showing superior properties, researches for large-area patterning and stiffness increase of NPSs are required. With this motivation, in this study, fundamental techniques to develop IAAL were suggested, and their feasibility was verified by realizing a new-concept nanodevice.
A new technique for large-area assembly of multiscale multidimensional NPSs was proposed by combining IAAL and a multi-spark discharge method. And, three-dimensional (3D) NPSs were uniformly constructed via IAAL utilizing a newly designed multi-pin spark discharge generator over a large area of 50 mm x 50 mm in a parallel manner. The effect of particle sizes on morphologies of NPSs was also studied. In addition, we produced 3D back reflectors based on various 3D NPSs showing superior performance relative to back reflectors fabricated by conventional fabrication methods.
A study on stiffness increase of NPSs via an electron-beam (e-beam) sintering method was performed as another effort to broaden applicability of multiscale multidimensional NPSs. We defined principle of e-beam sintering, and investigated variations in physical properties of NPSs via the e-beam sintering process. Furthermore, a newly combined approach of IAAL and the e-beam sintering technique was developed to fabricate NPSs with unique morphologies.
Based on those fundamental techniques developed herein, we demonstrated a thin-film silicon (Si) solar cell incoporating 3D NPSs with an objective to maximize the light trapping effect. The excellent performance of the thin-film Si solar cell employing 3D NPSs was validated by an experimental comparison with a cell incorporating nanoparticle clusters and by a theoretical comparison with a cell employing nanobump arrays. And, the thin-film Si solar cell with the 3D NPSs showed a 30% increase in short-circuit current density and a 20% increase in efficiency relative to a flat cell.
dc.description.tableofcontentsAbstract i
Contents iv
List of Tables vi
List of Figures vii
Nomenclature xiii

Chapter 1. Introduction 1
1.1. Background of Research 2
1.2. Objectives for Research 4

Chapter 2. Large-Area Uniform Fabrication Method of Multiscale Multidimensional Nanoparticle Structures 5
2.1. Introduction 6
2.2. Background of Research 9
2.2.1. IAAL for 3D Assembly of Nanoparticles 9
2.2.2. Spark Discharge Method for Generation of Charged Nanoparticles 11
2.3. Experimental Details 14
2.4. Results and Discussion 19
2.4.1. Uniformity of NPSs via IAAL with a Single-Pin SDG 19
2.4.2. Uniformity of NPSs via IAAL with a Multi-Pin SDG 21
2.4.3. Application: 3D back Reflectors 29
2.5. Conclusion 33

Chapter 3. Electron-Beam Sintering Method of Nanoparticle Structures and its application 34
3.1. Introduction 35
3.2. Background Knowledge for Research 37
3.2.1. Operating Principles of E-Beam Irradiation System 37
3.2.2. Sintering by Joules Heating 41
3.3. Results and Discussion 44
3.4. Conclusion 58

Chapter 4. Thin-Film Si Solar Cell incorporating 3D Nanoparticle Structures 59
4.1. Introduction 60
4.2. Experimental Procedure and Simulation 62
4.2.1. Fabrication Process for thin-film nc-Si:H solar cells Employing 3D NPS arrays 62
4.2.2. Setup for FDTD simulations 66
4.3. Results and Discussion 68
4.3.1. Optical Properties of the 3D BR 68
4.3.2. Optical and Electrical Performance of the 3D Solar Cell 74
4.3.3. Analysis of Enhanced Factors of the 3D Solar Cell 77
4.4. Conclusion 87

Chapter 5. Concluding Remarks 88

References 92
국문초록 108
dc.format.extent7750914 bytes-
dc.publisher서울대학교 대학원-
dc.subject스파크 방전-
dc.subject대면적 형성-
dc.subject빛 가둠-
dc.subject3차원 구조물-
dc.titleLarge-area assembly and restructuring of multiscale multidimensional nanoparticle structures and their application to a solar cell-
dc.title.alternative멀티스케일 다차원 나노입자 구조물 대면적 조립 및 재구조화 이의 태양전지 응용-
dc.contributor.AlternativeAuthorKyungyeon Ha-
dc.citation.pagesxiii, 110-
dc.contributor.affiliation공과대학 기계항공공학부-
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Mechanical Aerospace Engineering (기계항공공학부)Theses (Ph.D. / Sc.D._기계항공공학부)
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