摘要
高效晶体硅太阳电池是光伏领域的热门研究之一,提高晶体硅太阳电池的转换效率是光伏研究者的重要研究方向。降低电池背面反射率是提高晶体硅电池转换效率的有效方法之一,实验采用激光掺杂制作选择性发射极,并利用槽式湿法碱抛光技术,去除发射极表面的重掺杂区,降低载流子在电池发射极表面区域的复合,提高载流子的有效寿命达到抛光效果,并最终提升电池转换效率。结果表明:硅片经过抛光处理后,减少了作为复合中心的悬挂键,降低了表面复合速率。发现了高反射率增强了光的反射,反射回电池内部的光被再吸收,提高了光的利用率。这是造成短路电流提升的主要原因。表面掺杂浓度的降低以及表面重掺杂区尺寸的减小将有效抑制载流子在发射极区域的俄歇复合,提高载流子的有效寿命。
High efficiency crystalline silicon solar cell is one of the hot research fields in photovoltaic field.Improving the conversion efficiency of crystalline silicon solar cell is an important research direction of photovoltaic researchers.One of the effective methods to improve the conversion efficiency of crystalline silicon cells is to reduce the reflectivity of the back surface of the cell.The selective emitter is made by laser doping and the heavily doped area on the emitter surface is removed by groove wet alkali polishing technique.The recombination of carriers on the emitter surface is reduced and the carrier efficiency is improved.The service life achieves polishing effect and ultimately improves solar cell conversion efficiency.The results show that after polishing,the suspended bond as the composite center is reduced and the surface recombination rate is reduced.It is found that the high reflectivity enhances the light reflection,and the light reflected back into the solar cell is re-absorbed,which improves the light utilization.This is the main reason for short circuit current rise.The decrease of the surface doping concentration and the size of the heavily doped region will effectively inhibit the Auger recombination of carriers in the emitter region and increase the effective lifetime of carriers.
作者
庞恒强
PANG Heng-qiang(Zhengjiang Jinko Solar Co.Ltd., Haining 314000, China)
出处
《人工晶体学报》
EI
CAS
北大核心
2019年第1期178-184,共7页
Journal of Synthetic Crystals
关键词
PERC太阳电池
反射率
四甲基氢氧化铵背面抛光
槽式湿法碱抛光
效率提升
PERC solar cell
reflectivity
TMAH rear surface polishing
trough type wet method alkaline polishing
improving the efficiency
