研究目的
Investigating the recycling of silicon scraps by directional solidification coupled with alternating electromagnetic field and its electrical property.
研究成果
The combination of alternating magnetic field and directional solidification is effective in recycling polycrystalline silicon scraps. The inclusion particles in the cast polycrystalline silicon are mainly composed of the rod-shaped β-Si3N4 and bulk 3C–SiC. The electromagnetic force accelerates the melt flow and enhances the lift force, allowing larger particles to be pushed to the top of the ingot. The average conversion efficiency of the solar cells prepared using the recycled silicon meets market needs.
研究不足
The study did not mention the collective effect of magnetic field and directional solidification on the separation of inclusions particles in previous researches.
1：Experimental Design and Method Selection:
The study used inductive melting during directional solidification to recycle silicon scrap. The distribution of inclusion particles in silicon ingot under the combined action of magnetic field and directional solidification was investigated.
2：Sample Selection and Data Sources:
The raw materials used are silicon mixture, which contains polycrystalline silicon tailings with inclusion particles of about 1.49% and high purity Si material (purity 6 N).
3：49% and high purity Si material (purity 6 N).
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Industrial directional solidification furnaces (DPS650) was used to smelt silicon ingots. The melting furnace includes sealing furnace body, induction heating system, vacuum system, ingot lifting mechanism, temperature control system and pressure alarm and other auxiliary systems.
4：Experimental Procedures and Operational Workflow:
The raw materials were melted by induction heating. It was kept for 15h to ensure complete melting of the raw materials. The device drives the squatting movement to promote the directional solidification of the polycrystalline silicon by the pulling mechanism.
5：Data Analysis Methods:
The microstructure was observed using Electron Probe X-Ray Microanalysis (EPMA), Scanning Electron Microscope (SEM) and Energy Dispersive Spectrometer (EDS). The impurities concentrations of the sample were determined by Inductively Coupled Plasma Mass Spectrometer (ICP-MS).
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