ABSTRACT

The thermodynamic properties of impurities in silicon-based solutions are the theoretical basis of silicon purification technology. These properties represent valuable information in regards to impurity removal for solar-grade silicon production by metallurgical methods. The thermodynamic properties of impurity components in silicon solutions obtained by both model calculations and experimental measurements are reviewed in detail in this paper with special focus on the infinite dilute activity coefficient and activity interaction coefficient of impurity components in binary Si-i and ternary Si-i-j systems. A positive or negative activity interaction coefficient value can be used to predict a mutually reinforcing or mutually restrictive relationship among impurity components during silicon purification. This review may provide workable guidance to researchers in selecting suitable refining systems and optimized refining conditions for silicon purification according to the thermodynamic properties of the impurity components therein; further, they may be used to establish a silicon solution thermodynamics database to support silicon purification technology.

摘要

硅基溶液中杂质的热力学性质是硅提纯技术的理论基础。这些特性代表了有关通过冶金方法生产太阳能级硅的杂质去除的宝贵信息。本文详细回顾了通过模型计算和实验测量获得的硅溶液中杂质成分的热力学性质，特别关注二元 Si -i和三元 Si - ij中杂质成分的无限稀释活度系数和活度相互作用系数。系统。正或负活度相互作用系数值可用于预测硅提纯过程中杂质组分之间的相互加强或相互制约的关系。本综述可为研究人员根据其中杂质组分的热力学性质选择合适的精炼系统和优化的硅精炼条件提供可行的指导；此外，它们还可用于建立硅溶液热力学数据库，以支持硅纯化技术。