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研究生： 洪崧富
Hong, Song-Fu
論文名稱： 以化學浴沈積法製備硫化鎘緩衝層並應用在銅銦鎵硒太陽能電池之研究
The Study on Cadmium Sulfide Buffer Layer Prepared by Chemical Bath Deposition on CIGS Solar Cell Application
指導教授： 賴志煌
Lai, Chih-Huang
口試委員:
學位類別： 碩士
Master
系所名稱： 工學院 - 材料科學工程學系
Materials Science and Engineering
論文出版年： 2010
畢業學年度： 98
語文別： 英文
論文頁數： 122
中文關鍵詞： 硫化鎘 、緩衝層 、銅銦鎵硒 、太陽能電池
外文關鍵詞： cadmium sulfide, buffer layer, CIGS, solar cell
相關次數： 點閱：3  下載：0 
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    • Copper indium gallium diselenide (CIGS), which is cheap and has high efficiency, is one of the potential solar cells. In addition to CIGS absorber layer, the study on buffer layer and interface is also important for photovoltaic application. It means the fabrication of buffer layer much influences junction properties and cell performance. Recently, CIGS solar cell with cadmium sulfur buffer layer fabricated by chemical bath deposition (CBD) has the highest efficiency. Therefore, not only film properties but also interface quality are improved by CBD process.
    In this thesis, effects of CBD process on CIGS solar cell are focused. It is divided into three parts. In the first part, effects of CBD process on CdS film properties are discussed. Optimum quality of CdS film is obtained by controlling precursor concentration. In the second part, effects of CBD process on interface modification (surface etching and cadmium diffusion) are discussed. Interface could be improved by the enhancement of these modifications. In the final part, by taking two different effects above mentioned into consideration, adequate CdS buffer layer for CIGS solar cell application could be prepared by depositing CdS buffer layer on sputtering CIGS film prepared by quaternary compound target. In this circumstance, nearly 7% efficiency is demonstrated.

    Chapter 1 Introduction to Solar Cells 1 1.1 The Solution to Energy Issue: Photovoltaic 1 1.2 Different Kinds of Solar Cell 2 1.2.1 Bulk Type Solar Cells (First Generation) 3 1.2.2 Gallium Arsenide Solar Cell 4 1.2.3 Thin Film Solar Cells (Second Generation) 5 1.2.4 New-Concept-Type Solar Cells (Third Generation) 7 Chapter 2 CIGS Solar Cell 8 2.1 The Definitions of the Parameters for Solar Cells 9 2.1.1 Solar Spectrum 9 2.1.2 Principle of Solar Cell Operation 10 2.2 The CIGS-Based Solar Cell 12 2.2.1 The Structure of CIGS Solar Cell 12 2.2.2 The Development of CIGS Solar Cell in NREL 17 2.3 Buffer Layer in CIGS-Based Solar Cell 18 2.3.1 Principle of Buffer Layer 18 2.3.2 Chemical Bath Deposition 19 2.4 Chemical Bath Deposition for CdS 21 2.4.1 Properties of CBD CdS 21 2.4.2 Preparation of CBD CdS 24 2.4.3 Deposition Mechanism of CBD CdS 25 2.4.4 The Function of CBD CdS 28 2.5 Interface and Junction in CIGS Solar Cell 30 2.5.1 Ordered Defect Chalcopyrite (ODC) 30 2.5.2 Surface Defect Layer 32 2.5.3 Identification of Junction 33 2.6 Scope of this Thesis 34 Chapter 3 Experimental Techniques 35 3.1 Experimental Flow Chart 35 3.2 Sample Preparation 36 3.2.1 Substrate Clean 36 3.2.2 CdS Film Growth on Glass 37 3.2.3 CdS Film Growth on Sputtering CIGS Substrate 38 3.3 Analysis Technique 38 3.3.1 Field Emission Scanning Electron Microscope (FE-SEM) 38 3.3.2 Grazing-Incident X-Ray Diffraction (GIXRD) 39 3.3.3 UV-Visible Spectroscopy 40 3.3.4 Two-Point Probe Electrical Measurement System 40 3.3.5 Solar Simulator 41 3.3.6 Energy-Dispersive X-ray Spectroscopy (EDX) 41 3.3.7 Auger Electron Nanoscope (Nano-Auger) 41 Chapter 4 Results and Discussion 42 4.1 The Effect of CBD Solution on CdS Film 42 4.1.1 Condition: 80℃_1.5mM_TU_NH3_30min 43 4.1.2 Condition: 80℃_3.0mM_TU_NH3_30min 47 4.1.3 Condition: 80℃_0.5mM_TU_NH3_30min 49 4.1.4 Summary: Condition: 80℃_CdSO4_TU_NH3_30min 51 4.1.5 Summary: Condition: 60℃_CdSO4_TU_NH3_1hr 52 4.2 The Effect of CBD Solution on CIGS Surface 55 4.2.1 Etching Effect of CBD Solution on CIGS 56 4.2.2 Cadmium Ion Diffusion 58 4.2.3 Summary: CIGS Surface Modification 60 4.3 CdS Buffer Layer Presented in My System 60 Chapter 5 Conclusions 62 Reference 63 Appendix - Tables 72 Appendix - Figures 77

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