Development and Situation of Boron Removal from Solar Grade Silicon

Abstract—In recent years, more and more attentions have been paid to the research of producing solar grade silicon by the metallurgical method，boron removal has always been difficult and important in various technologies. In this paper the recent research on removing boron is summarized. The boron removal is calssfied by the different forms of boron in removing boron: gaseous-boron removal, solid-boron removal and electrorefining-boron removal. The principle and outcomes of each boron removal craft are survered and compared, the possible application prospect is predicted. Keywords- Metallurgical grade silicon; solar grade silicon; gaseous-boron removal ； solid-boron removal ； electrorefining-boron removal I