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http://dx.doi.org/10.21218/CPR.2019.7.1.021

Development of Copper and Copper Oxide Removal Technology Using Supercritical CO2 and Hexane for Silicon Solar Cell Recycling  

Lee, Hyo Seok (Department of Meterials Science & Engineering, and Optoelectronics Research Center, Chonnam National University)
Cho, Jae Yu (Department of Meterials Science & Engineering, and Optoelectronics Research Center, Chonnam National University)
Heo, Jaeyeong (Department of Meterials Science & Engineering, and Optoelectronics Research Center, Chonnam National University)
Publication Information
Current Photovoltaic Research / v.7, no.1, 2019 , pp. 21-27 More about this Journal
Abstract
Lifetime of Si photovoltaics modules are about 25 years and a large amount of waste modules are expected to be discharged in the near future. Therefore, the extraction and collection of valuable metals out of discharged Si modules will be one of the important technologies. In this study, we demonstrated that supercritical $CO_2$ extraction method can be effectively used to remove Cu, one of the abundant elements in the module, as well as its oxide form, $Cu_2O$. Especially, we proved that the addition of hexane as co-solvent is effective for the removal of both materials. The optimal ratio of $CO_2$ and hexane was 4:1 at a fixed temperature and pressure of $250^{\circ}C$ and 250 bar, respectively. In addition, it was proven that the removal of $Cu_2O$ was preceded via reduction of $Cu_2O$ to Cu.
Keywords
Supercritical fluid; Carbon dioxide; Hexane; Metal removal; Solar cell;
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