高效晶体硅太阳电池性能研究报告Word格式.docx

1、凝聚态物理2014年05月Investigation of Mechanical Property for Silver Paste-Si Contact of High Efficient Crystalline Silicon Solar CellsA thesissubmitted toXian Jiaotong Universityin partial fulfillment of the requirementsfor the degree ofMaster of ScienceByChuanke ChenSupervisor: Associate Prof. Hong Yang（C

2、ondensed Matter Physics）May 2014论文题目：摘要对于晶体硅太阳电池而言，其前银电极和硅基底之间的力学性能对光伏组件的长期可靠性和使用寿命起着至关重要的作用。银硅接触的性能衰减是导致晶体硅太阳电池及其组件失效的主要原因之一。加之太阳电池的开展趋势正朝着高阻细栅的方向开展，这就要求太阳电池的前银电极栅线的宽度不断减小，即银硅接触面积减小，以到达节约银的用量并增加光线利用率的目的。但是对于目前的太阳电池用银浆来说，随着银栅线的宽度减小，银硅接触的力学性能会急剧退化。如何在保证银硅接触的力学性能的前提下，降低银浆的使用量，节省生产本钱，实现光伏发电平价化，并提高太阳电池及

3、其组件的使用寿命和可靠性是当下光伏行业一个迫切亟待解决的问题。本文从理论和实验两个方面着手，深入系统地研究了高效晶体硅太阳电池前电极银硅接触构造的力学性能。理论方面，我们基于构造力学首次建立了银硅接触构造的剪切力与栅线宽度之间的数学模型，并用剪切实验对该模型进展了验证；实验方面，我们研究了太阳电池生产工艺对银硅接触构造附着力的影响，银硅接触界面微观构造对晶体硅太阳电池银硅接触附着力的影响，以及银硅接触构造附着力与太阳电池及其组件功率衰减的关系。通过研究我们发现，晶体硅太阳电池的银硅接触构造的力学性能与栅线的宽度成线性关系，与电池的生产制造工艺以及所选用的材料性能密切相关；同时银厚膜的致密度和银

4、厚膜与硅基底的接触方式对银硅接触构造的力学性能也有重要影响；银硅接触构造的力学性能是影响晶体硅太阳电池及其组件可靠性的关键因素之一，银硅接触力学性能差的组件在户外运行时，其功率衰减程度更大，更容易失效。这些研究成果，为未来太阳电池技术改良以及导电银浆的开展奠定了理论和实验根底。关 键 词：太阳电池；银硅接触；附着力；可靠性论文类型：应用研究Title:Descipline: Condensed Matter PhysicsApplicant: Chuanke Chen Associate Prof.Hong YangABSTRACTFor crystalline silicon solar c

5、ells, the mechanical properties of front metallization are critical to solar modules reliability and long-lifetime. The mechanical properties degradation is one of major factors which cause solar cells and solar modules to failure ahead of time. The development direction of crystalline silicon solar

6、 cells is forward to high emitter resistance and pact fingers, this means the width of fingers needs to be more fine to meet the targets of cost saving and increasing utilization rate of light. However, to the silver paste used for photovoltaic, the mechanical properties degradations seriously with

7、the widths of finger finer. In photovoltaic, the urgent problem is not only needs to promote the mechanical properties of Ag-Si contact, but also needs to cut the cost and further develop the reliability and long lifetime of solar cells and solar modules. Therefore, this paper investigates the mecha

8、nical properties of Ag-Si contact for crystalline silicon solar cells system from theory and experiment. Firstly, based on Structural Mechanics and Mechanicals of Materials, we have built the mathematical model of Ag-Si contact between the shear force and bus-bar width, and which was verified by she

9、ar test. Secondly, the effects of process on interfacial adhesion strength of Ag-Si for crystalline silicon solar cells, the impacts of interface microstructure on adhesion force between silver paste and silicon solar cells emitter, and the effects of binding force between silver paste and silicon o

10、n power degradation of crystalline silicon solar modules were investigated respectively. Through above investigations we have gotten some conclusions about the mechanical properties of crystalline silicon solar cell as follows: the shear strength of Ag-Si contact shows a linear relationship with the

11、 bus-bar width, and also shows closed relation to process and materials used; the positionof silver paste would affect the interface microstructureand the mechanical property of silver thick-filmand Ag/Si contact interface; The binding force reduction between silverpaste and silicon leads to power d

12、egradation during subsequentqualification tests or outdoor using.These results laid the foundation for studying themechanical properties of front contact metallization forscreen-printed crystalline silicon solar cells.KEY WORDS:Solar cells; Ag-Si contact; Adhesion; ReliabilityTYPE OF THESIS: Applica

13、tion Research声明CONTENTS1 Introduction 11.1Development and Present Situation of Solar Cell 11.2Main ResearchWorkand Background41.2.1Background41.2.2Contents and Meaning 52Principle and Characterization of Crystalline Silicon Solar Cells 72.1Principle of Crystalline Silicon Solar Cells 72.2Solar Cells

14、 Classification 82.3 Structure of Crystalline Silicon Solar Cells 82.4Characterization Parameters 92.4.1Photocurrent 92.4.2Photovoltage 112.4.3Equivalent Circuit 122.4.4 Power Output 122.4.5Fill Factor 122.4.6 Efficiency of Solar Cell 123Theoretical Research on Ag-Si Contactfor Crystalline Silicon S

15、olar CellShear Force Mathmatic Model for Ag-Si Contact 133.1Theoretical Derivation 133.2 Experiment Verification 183.3 Results and Discussion193.4Brief Summary204Experimental Research on Ag-Si Contactfor Crystalline Silicon Solar Cell 214.1Process of Solar Cell Production 214.1.1Wafers Detection 214.1.2Cleaning and Texturing 224.1.3Doping 234.1.4Etching Perimeter 244.1.5Eliminating PSG 24