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Abstract

Silicon (Si)-wafer-based solar cells have dominated the global market with a share exceeding 90% due to their abundant source material and well-known physical and chemical properties. The brittleness of silicon material limits its further applications. It is necessary to investigate the material strength properties of Si wafer and/or Si solar cells, which can guide the fabrication process of Si solar cells to avoid breaking the Si wafers. The Si material strength properties have been extensively investigated by the methods of three-point bending test and four-point bending test. However, the difference between these two methods has not been studied so far. In this work, the mechanical strength properties of monocrystalline silicon (c-Si) wafer and bifacial c-Si solar cells are measured by three-point bending test and four-point bending test respectively. The average value of the maximum bending displacements has a little discrepancy between the results of the three-point bending test and four-point bending test methods. It is worth noting that the degree of dispersion of the Si wafer test results of the three-point bending test is larger than those of the four-point bending test. And the results of the dispersion of the Si bifacial solar cells, obtained from the two bending test methods, show no difference between them due to the existence of metalized electrodes. Whether the measured sample is Si wafer or Si solar cell, the average value of the maximum load, obtained from the four-point bending test, is higher than that from the three point-bending test method, and the average value of the fracture strength, obtained from the four-point bending test, is lower than that from the three-point bending test method. By establishing the models of different beams, the applied load gets dispersed through two bars of the four-point bending test method, whereas the applied load is directly applied to the sample through one bar of the three-point bending test method, which can explain the relatively large difference between these two test methods.

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Authors and contacts

Corresponding author:Wei De-Yuan,deyuan.wei@hotmail.com

Funds:Project supported by the Young Scientists Fund of the National Natural Science Foundation of China (Grant No. 61704045) and the National Natural Science Foundation of China (Grant No. 11604072).

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Cited By

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单位	国家	样片	厚度	测试方法	研究内容	年份	参考文献
TNI-UCC	爱尔兰	单晶硅片	50—525 μm	三点弯曲	用统计方法建立了不同厚度单晶硅材料断裂强度的模型	2006	[3]
Fraunhofer -IMM	德国	单晶硅片	48—200 μm	三点弯曲	分析了磨削、抛光、蚀刻工艺对薄硅试样机械强度的影响	2007	[5]
RERC-FREI-AIST	日本	单晶硅片	200—250 μm	三点弯曲	金刚线切割时产生的应力损伤层对单晶硅片机械性能的影响	2008	[6]
浙江大学	中国	单晶硅电池	200 μm	三点弯曲	背电极花样对单晶硅电池的机械强度有明显影响	2011	[7]
浙江大学	中国	多晶硅片	220 μm	三点弯曲	铸锭多晶硅中, 锗掺杂能增强多晶硅片的机械强度	2011	[8]
SUTD	新加坡	光伏组件	—	三点弯曲	封装材料对太阳能光伏组件的可靠性影响	2016	[9]
Solarforce S.A.	法国	多晶硅片	60—140 μm	四点弯曲	研究了带状生长多晶硅的弯曲强度随不同工艺条件的变化	2015	[10]
UNSW	澳大利亚	多晶硅片	200 μm	四点弯曲	硅片的边缘缺陷对多晶硅片断裂强度的影响	2009	[2]
CMME	西班牙	多晶、单晶、类单晶	200 μm	四点弯曲	对相同厚度的多晶、单晶、类单晶的晶体硅片的机械强度进行了比较	2014	[11]
IEP-TUBF	德国	多晶硅片	250—300 μm	四点弯曲	研究了损伤腐蚀对太阳能硅片力学性能的影响	2009	[4]
UNIST	韩国	单晶硅片	50 μm	四点弯曲	同制绒工艺改变硅片表面形貌对晶体硅机械性能的影响	2017	[12]
Fraunhofer -CSP	德国	多晶硅片	—	四点弯曲	激光钻孔对机械性能的影响	2012	[13]
MEC	日本	多晶硅片	200—300 μm	四点弯曲	金刚线切割多晶硅片的弯曲强度, 并对不同强度值产生的原因进行了分析	2011	[14]
ISFH	德国	光伏组件	—	四点弯曲	标准尺寸太阳能光伏组件在受压情况下的裂纹分布情况	2016	[15]
注: TNI-UCC, Tyndall National Institute, University College Cork (科克大学, 廷德尔国立研究所); Fraunhofer-IMM, Fraunhofer-Institute for Mechanics of Materials (弗劳恩霍夫材料力学研究所); RERC-FREI-AIST, Renewable Energy Research Center, Fukushima Renewable Energy Institute, National Institute of Advanced Industrial Science and Technology (国家先进工业科学技术研究所, 福岛可再生能源研究所, 可再生能源研究中心); SUTD, Singapore University of Technology and Design (新加坡科技设计大学) UNSW, University of New South Wales (新南威尔士大学); IEP-TUBF, Institute of Experimental Physics, TU Bergakademie Freiberg (弗莱贝格工业大学, 实验物理研究所); MEC, Mitsubishi Electric Corporation (三菱电力公司); Fraunhofer-CSP, Fraunhofer Center for Silicon Photovoltaics (弗劳恩霍夫硅光电中心); CMME, Centre for Modelling in Mechanical Engineering (机械工程建模中心); Solarforce S.A., 太阳力股份有限公司; ISFH, Institute for Solar Energy Research Hamelin (哈梅林太阳能研究所); UNIST, Ulsan National Institute of Science and Technology (蔚山国家科学技术研究院).

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Vol. 68, Issue 20 - 2019-10-20

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