高效PERC单晶硅太阳电池局部背表面场的工艺研究STUDY ON THE PROCESS OF LOCAL REAR SURFACE FIELD OF HIGH EFFICIENCY PERC MONOCRYSTALLINE SILICON SOLAR CELL
王丽婷,黄国平,黄惜惜,贾佳,周肃,李菁楠
摘要(Abstract)：
钝化发射极和背面电池(PERC)的局部背表面场是指通过对电池背面的钝化层进行激光开槽形成局部接触。研究了激光参数设置和激光图形对电池背表面场局部接触的影响,根据电池转换效率来确定最佳的激光参数和激光图形。用奥林巴斯显微镜分析了在不同激光速度和不同激光实线比条件下,电池的背面铝浆填充率的变化;用Halm电学性能测试仪分析了在不同背面铝浆填充率和不同激光间距,以及背电极是否被激光覆盖这些条件下,电池电性能的变化趋势。结果表明,背面铝浆填充率为35%时,电池转换效率最佳。再根据不同激光速度和不同激光实线比的正交试验,反推出当激光速度为16000 m/s、激光实线比为50%时,更有利于提升电池转换效率;当激光开槽间距为1275μm时,电池转换效率最佳;背电极激光镂空与激光填满实验相比,背电极激光镂空的电池转换效率可增加约0.06%。
关键词(KeyWords)： PERC;局部背表面场;激光开槽;激光参数;背电极;太阳电池
基金项目(Foundation): 国家自然科学基金(61874120);; 江苏省国际科技合作项目(BZ2017033)
作者(Author): 王丽婷,黄国平,黄惜惜,贾佳,周肃,李菁楠
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