Researchers at the Academy of Scientific and Innovative Research (AcSIR) in India have used the SPS technique to produce polysilicon ingots from recycled solar cells in end-of-life PV modules. They claim to have produced small-sized ingots with purity levels of 98% to 99%.
These purity levels slightly exceed the 3N purity level, which the scientists say is greater than that of metallurgical-grade silicon. It is also “good enough” for applications other than solar cells, like battery materials.
“Currently, we are working towards the purification process of recovered silicon to grow ingot better than 5N, so that same can be used in the fabrication of new solar cells,” researcher Sushil Kumar told pv magazine. “This work is expected to be completed in the next few months.”
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