SiC 結晶成長における数値解析の最近の発展

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  • Recent Developments of Numerical Calculation in Crystal Growth of SiC
  • SiC ケッショウ セイチョウ ニ オケル スウチ カイセキ ノ サイキン ノ ハッテン

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　The effect of nitrogen and aluminum as doped impurities on the stability of SiC polytypes (C- or Si-face 4H and 6H substrates) formed by physical vapor transport (PVT) was investigated. The stability of the polytypes was analyzed using classical thermodynamic nucleation theory with numerical results obtained from a global model including heat, mass and species transfer in a PVT furnace. The results reveal that the formation of 4H-SiC was more stable than that of 6H-SiC when a grown crystal was doped with nitrogen using C-face 4H- and 6H-SiC as seed crystals. In contrast, formation of 6H-SiC was favored over 4H-SiC when Si-face 4H- and 6H-SiC seed crystals were used. Meanwhile, the formation of 4H-SiC was more stable than that of 6H-SiC when aluminum was the dopant and C- and Si-faces of 6H-SiC were used as seed crystals. 6H-SiC was preferred to grow rather than 4H-SiC in the cases of C- and Si-faces of 4H-SiC as seed crystals.<br>

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