一种太阳能高效多晶硅铸锭用坩埚底部引晶涂层的制备方法

介绍一种太阳能电池用高效多晶硅片生产过程中,铸锭用坩埚底部引晶涂层的制备方法。此方法是在坩埚底部分别制备两个涂层:第一层是硅粉和无机陶瓷胶的混合物,第二层是氮化硅粉和无机硅溶胶、去离子水的混合物。此方法的创新点是将硅粉替代传统的石英砂作为引晶晶核来制作引晶层。结果表明,与传统石英砂引晶层相比,此方法产生的多晶硅锭晶体均匀、位错少,制成的太阳能电池转换效率高(平均达到17.8%)。

A Preparation Method of High Efficiency of Solar Polysilicon Ingot Crucible Bottom Seed Coating

A preparation method of seed coating in ingot crucible bottom was introduced.The method was used in solar cells with high efficiency polycrystalline silicon wafer production process.The results show that two coating were prepared at the bottom of the crucible.The first layer is a mixture of silicon powder and an inorganic ceramic paste.The second layer is a mixture of a silicon nitride powder,an inorganic sol,deionized water.The innovation point of the method is that the silicon powder instead of the traditional quartz sand as the lead crystal nucleus to produce a seed layer.The crystals evenly and less dislocation of polysilicon ingot were produced with the method.The solar cells of high conversion efficiency（about 17.8%）are made.