太阳能级回收硅料清洗效果研究简

通过对光伏领域回收硅料表面处理一般方法的研究,使用ICP-MS对比分析了光伏产业使用不同类型硅料经混酸腐蚀处理前后,表面金属杂质种类、含量及清洗效果的变化,并使用SEM对硅料清洗前后的形貌进行了微观分析.结果表明HF/HNO3混酸体系对于过渡族金属杂质Cu、Zn、Mn去除效果较好,对于Ti、Cr金属杂质特别是Fe的去除效果较差;硅料表面微观结构越光滑,杂质去除效果越好.

Study on the cleaning effect of recycling solar-grade silicon materials

According to the common methods of treating recycling photovohaic silicon materials surface, this paper compares and analy- zes the changes of types, content and cleaning resuhs of metal impurities using ICP - MS. These changes are showed from different types of silicon materials which are eroded in mixed acid and more often use in PV industry.. Meanwhile, the paper analyzes the micro- structure of the silicon materials which are treated before and ＇after cleaning using SEM. For transition metal impututies, the results show the HF/HNO3 mixed acid system is less effective to remove Ti,Cr, especially Fe, but more effective to remove Cu, Zo, Mn. In addi- tion, for silicon materials, the smoother the microstructure of surface, the more effective removing the impurities is.