A Review of Slag Refining of Crude Silicon

Metallurgical refining of crude silicon for low-cost, mass production of solar silicon has been studied extensively over the past two decades. One of the methods attempted to target the deleterious impurities of Si is slag refining, where liquid Si or its alloys are treated with a flux. This article presents an overview of the impurity response to various slag treatment conditions for crude Si metal from both fundamental and practical …