强辐射催化法提纯多晶硅  

Purification of silicon by the method of strong radiation catalysis

作　　者：陈应天[1] 何祚庥[1] 

机构地区：[1]中国科学院理论物理研究所,北京100190

出　　处：《物理学报》2011年第7期895-919,共25页Acta Physica Sinica

摘　　要：将低纯度的金属硅,提纯成可用于制造太阳能电池的高纯硅材料的主要关键,是去除材料中的硼杂质.本文提出了一种采用特殊的造渣过程以去除硼杂质的新方法.在这种新方法中,为了促进快速的化学反应,采用高密度的光子作为催化剂,以达到太阳能级硅材料的标准.本文对使用这种新的强辐射催化法炼硅的高温工具、冶炼方法、材料配方、材料的混合、以及渣剂的分离等关键技术,进行了详尽的公开和讨论,并在强辐射光催化原理的研究方面提出了一些探索性的机理.为了方便读者使用本文所提出的方法,建立起一套完整的提炼太阳能级硅材料的工业系统,本文也就去硼后的硅材料中去磷的冷阴极电子束的方法,以及采用磁悬浮无坩埚的定向凝固方法去除金属,提出了一些新的设计和建议.关于本文所提出的方法是否能扩展到电子级硅材料的冶炼工业,本文所提出的无光象定日镜能否扩展应用于其他太阳能光热领域,以及所提出的宏观光化学催化假设能否获得更多的实验验证等,也试图进行了一些进一步的讨论.希望本文所提出的方法,能够在全球科学家们所孜孜以求的低碳、低成本的太阳能产业的巨大努力中,走出一条同传统方法不同的道路.Among others, the removal of boron is the key issue to effectively purify metallurgical silicon into solar grade silicon. An innovative slagging process is proposed in this article after reviewing many previous studies. In the process, strong radiation is employed as catalysis to promote the chemical reaction. The authors have for the first time unveiled the secrets including the newly developed high temperature tools, the materials used, the method of mixing materials before purification, the process for separating silicon from residuals after purification, etc.. In the meantime, the authors also propose a postulate to explain the mechanism of the catalysis process. Except the removal of boron, the processes to remove other impurities, such as phosphorous and residual metals using electron beam and magnetic floating directional solidification are also discussed for the completion of a new industrial process to fabricate pure silicon. In the article, the authors also extend their discussion to the possibility of using the proposed non - imaging heliostat in other fields ; to the possibility to further manufacture electronic grade silicon using the same process ; to the possibility to obtain more experimental evidences for the postulate of strong radiation catalysis and to other subjects related to authors＇ claimed creations. It is sincerely hoped that the publication of the innovations reported in this article may provide an alternative way in the route map for the use of renewable energy of low cost and low carbon emission.

关 键 词：多晶硅提纯 光催化 太阳炉 除硼 除磷 多晶硅 

分 类 号：TN304.12[电子电信—物理电子学] TM914.4[电气工程—电力电子与电力传动]