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Evaporated metal aluminium and calcium removal from directionally solidified silicon for solar cell by electron beam candle melting |
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| Authors: | Dachuan Jiang Yi Tan Shuang Shi Wei Dong Zheng Gu Xiaoliang Guo |
| Affiliation: | a School of Materials Science and Engineering, Dalian University of Technology, No. 2 Linggong Road, Ganjingzi District, Dalian City, Liaoning Province 116023, China b Key Laboratory for Solar Energy Photovoltaic System of Liaoning Province, School of Materials Science and Engineering, Dalian University of Technology, No. 2 Linggong Road, Ganjingzi District, Dalian City, Liaoning Province 116023, China |
| Abstract: | During the refinement of metallurgical-grade silicon (MG-Si), Al and Ca cannot be reduced to a target level by conducting directional solidification only once. Electron beam candle melting (EBCM) is a new method that can be used to further reduce Al and Ca by directly melting Si ingots after directional solidification. A certain stable molten pool with a maximum surface area and a minimum depth exists and is proven to effectively remove Al and Ca. The energy utilization ratio during EBCM is also compared with that of electron beam melting (EBM). |
| Keywords: | Electron beam melting Molten silicon Aluminium Calcium Impurities removal |
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