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研究生: 方毓傑
Fang, Yu-Chieh
論文名稱: 低溫氧化於商業型結晶矽太陽電池之研究
The Study of Low Temperature Oxidation on the Commercial Crystalline Silicon Solar Cell
指導教授: 張守進
Chang, Shoou-Jinn
蔡進耀
Tsai, Chin-Yao
學位類別: 碩士
Master
系所名稱: 理學院 - 光電科學與工程研究所
Institute of Electro-Optical Science and Engineering
論文出版年: 2005
畢業學年度: 93
語文別: 英文
論文頁數: 67
中文關鍵詞: 太陽電池氧化
外文關鍵詞: oxidation, solar cell
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  •   本研究採用改良型態的氧化技術,利用photo-CVD的氘燈於腔體進行低溫氧化反應(< 500℃),並以網版印刷的方式製作太陽電池。

      主要討論不同氧化溫度下所生成的SiO2薄膜的品質。利用AFM分析其表面粗糙度;FTIR分析元素鍵結;以及使用C-V量測換算Dit來觀察界面的品質。最後組合PECVD沉積SiNx薄膜來研究其反射和折射率等光學特性,並應用於太陽電池的製程上。

      在太陽電池的應用上,我們發現使用雙層抗反射層可以增加光線的吸收,以及更良好的表面鈍化效果,從短路電流的數據中,可以得到相同的結果。且使用此氧化法,可以降低一般熱氧化法所需的熱預算。

      In this thesis, we use the improved method on oxidation. We use D2 lamp and photo-CVD chamber to advance oxidation at lower temperature (<500℃) and use screen-printing technique to produce solar cells.

      We mainly discuss the quality of SiO2 at different temperatures. We use AFM to measure the roughness of surface, FTIR spectrum to analyze the bonding of elements and C-V measurements to calculate Dit to observe the interfacial quality. Finally, we combine SiO2 with SiNx deposited by PECVD to measure the optical characteristics such as reflectance and refractive index. We also apply it to solar cell fabrication.

      We find this double layer antireflection coatings can improve the absorption of photons and have better interfacial quality. The measurements of short circuit current also show the same effect and we can use this photo-assist oxidation to reduce the thermal budget compared to common thermal oxidation.

    i.....Abstract (in Chinese) ii....Abstract (in English) iv....Contents vii...Figure Captions x.....Table Captions Chapter 1 Introduction 1 1-1 Development of Solar Energy 2 1-2 Oxidation by Photo-CVD Chamber 3 1-3 Thesis Outline Chapter 2 Theorem and Background 2-1 Solar Cell 5 2-1-1 Structure of Solar Cell 6 2-1-2 Solar Cell Mechanism 7 2-1-3 Current and Voltage 8 2-1-4 Efficiency and Equivalent-circuit Model 9 2-2 Surface Effects 11 2-3 Deposition and Passivation of SiNx 2-4 Photo-assist Oxidation 12 2-4-1 Introduction to Photo-CVD 12 2-4-2 Direct Photo-CVD 14 2-4-3 Photo-assist Oxidation Mechanism Chapter 3 Experiments and Measurements 15 3-1 Sample Preparation 16 3-2 Scanning Electron Microscope (SEM) 17 3-3 Fourier Transform Infrared Spectroscopy 17 3-4 Atomic Force Microscope (AFM) 18 3-5 Capacitance-voltage (C-V) Measurements 19 3-6 Hall Measurements 3-7 Optical Measurements 20 3-7-1 Spectrometer 21 3-7-2 Ellipsometer 3-8 Fabrication and Testing of Solar Cell 21 3-8-1 Cleaning and Texturing 22 3-8-2 P-N Junction Formation 22 3-8-3 Thermal Oxide 23 3-8-4 Antireflection Coating Layer 23 3-8-5 Screen Printing 24 3-8-6 Performance Testing Chapter 4 Results and Discussion 4-1 Metallization Observation 26 4-1-1 Screen-printed Metallization 26 4-1-2 Back Surface Field (BSF) 4-2 Growth Rate for Photo-assist Oxidation 27 4-2-1 Temperature, Pressure and Temperature 28 4-2-2 Growth Rate of Different Positions 29 4-3 Surface Analyses 30 4-4 Composition Analyses 31 4-5 Interfacial Measurements 4-6 Optical Characteristics 32 4-6-1 Refractive Index 33 4-6-2 Reflectance 34 4-7 Solar Cell Performance 36 Chapter 5 Conclusion 38 Figure 62 Table 64 Reference

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