邹文杰 1晏海刚 1孙敬红 1邱望愿 1张仕君 1罗伟1
作者信息
- 1. 义乌晶澳太阳能科技有限公司,金华 322000
- 折叠
摘要
Abstract
Compared with whole PV modules,half-piece PV modules have higher output power and superior reliability.However,when conducting electroluminescence(EL)testing on such PV modules,it is found that the problem of EL images blackening on the cutting surface of solar cells frequently occurs.This paper first introduces the structure and sintering process principle of PERC solar cells,as well as the EL imaging principle.Then,through experiments,the appearance,silver aluminum contact resistance,and microstructure of overlap between back field and back electrode of the solar cell detecting by scanning electron microscopy(SEM)in the half-piece PERC PV module are analyzed and studied to infer the reason for the EL image blackening on the cutting surface of the solar cell.Then,a verification experiment is conducted to investigate the cause,and improvement measures are proposed for the contact effect at the overlap between back field and back electrode of solar cells,thereby enhancing the yield of PV modules product.The research results show that:1)The obvious tearing gap at the overlap between back field and back electrode is the main reason for the EL image blackening of the solar cell cutting surface in the half-piece PERC PV module.Silver and aluminum undergo a fusion reaction due to high-temperature expansion,resulting in a high degree of alloying caused by excessive reaction.During cooling,the thermal expansion coefficients of silver and aluminum are different,and the silver aluminum paste will shrink during cooling,causing tearing at the overlap between back field and back electrode,resulting in gaps and voids,which deteriorates the silver aluminum contact effect,severely increases the silver aluminum contact resistance value,causes abnormal current transmission,and ultimately leads to EL image blackening of the half-piece PERC solar cell cutting surface.2)By controlling the peak sintering zone in the sintering temperature of the PERC solar cell sintering process,the silver aluminum contact resistance at the overlap between back field and back electrode can be reduced,improving the contact effect at that location,thereby improving the EL image blackening on the cutting surface of half-piece PERC solar cells,and ultimately improving the product yield of half-piece PERC PV modules.关键词
PERC光伏组件/半片技术/太阳电池切割面/背场和背电极搭接处/烧结温度/银铝接触/电致发光图像发黑Key words
PERC PV modules/half-piece technology/solar cell cutting surface/overlap between back field and back electrode/sintering temperature/silver aluminum contact/EL image blackening分类
信息技术与安全科学
