Silicon Purification by a New Type of Solar Furnace

We propose a new method to reveal a direct transformation from solar energy to solar electricity. Instead of using electricity in the process, we use concentrated solar rays with a crucibleless process to upgrade metallurgical silicon into solar-grade silicon feedstock.     

Development of silicon purification by strong radiation catalysis method

Using a new type of solar furnace and a specially designed induction furnace,cost effective and highly efficient purification of metallurgical silicon into solar grade silicon can be achieved.It is realized by a new method for extracting boron from silicon with the aid of photo-chemical effect.In this article,we discussed the postulated principle of strong radiation catalysis and the recent development in practice.Starting from ordinary metallurgical silicon,we achieved a purification result of 0.12 ppmw to 0.3 ppmw of boron impurity in silicon by only single pass of a low cost and simple process,the major obstacle to make ’cheap’ solar grade silicon feedstock in industry is thus removed.