Abstract
As container for the photovoltaic (PV) Si growth, fused silica crucible can only be used once owing to crystallization breakage, which inevitably reduces the quality and yield of Si. To develop re-useable crucible, Si3N4 ceramics were successfully fabricated using novel BaSiO3 (0-8 wt%) as sintering aid. Higher BaSiO3 content promotes the densification and sintering of Si3N4 ceramic. Then, the wetting/infiltration behaviors of Si/Si3N4 binary systems were systematically investigated by sessile drop test and microstructural analysis technology. With 8 wt% BaSiO3 introduction, the Si3N4 ceramic displayed larger contact angle of Si drop and excellent Si infiltration resistance, which was determined by de-oxidation rate. Moreover, three type of infiltrations, including infiltrations under Si drop and beyond Si drop (on/under substrate surface), were found and systematically analyzed. In this work, novel sintering aid (BaSiO3) was developed for Si3N4 ceramic fabrication at relatively lower sintering temperature. Additionally, the data of wetting/infiltration behavior for Si/Si3N4 binary system can be used to guide the application of Si3N4 crucible in PV Si manufacture.
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