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首页> 外文会议>European Photovoltaic Solar Energy Conference; 20060904-08; Dresden(DE) >MODELING OF PARTICLE PRECIPITATION AND SOLUTE TRANSPORT DURING DIRECTIONAL SOLIDIFICATION OF MULTI-CRYSTALLINE SILICON
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MODELING OF PARTICLE PRECIPITATION AND SOLUTE TRANSPORT DURING DIRECTIONAL SOLIDIFICATION OF MULTI-CRYSTALLINE SILICON

机译：多晶硅定向凝固过程中颗粒析出和溶质运移的建模

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摘要

A CFD model for impurity distribution and solidification of mc-Silicon is extended in this work by an advanced mass transfer model used at the ingot boundaries. The mass transfer model is based on complex thermodynamic data to model dissolution of coating and crucible in the silicon alloy and to model also evaporation and dissolution of impurities at the melt surface. The CFD model is also extended by an equilibrium model for formation of particles from the liquid alloy. Six impurity elements and three particles phases are included (B, Al, C, N, O, Fe and SiC, Si_3N_4, SiO_2 particles). The complete CFD model allows prediction of local impurity and particle concentrations fully coupled to the density gradient driven flow in the melt. Results from an example simulation which covers the holding period prior to solidification and the solidification period are presented. The results are qualitatively confirmed by some experimentally observed trends. Moreover, the results show that impurity pick-up during the holding period is considerable (in particular for nitrogen and oxygen).
机译：在这项工作中，通过在晶锭边界处使用的高级传质模型扩展了用于硅硅杂质分布和凝固的CFD模型。传质模型基于复杂的热力学数据，以模拟涂层和坩埚在硅合金中的溶解，并还模拟熔体表面杂质的蒸发和溶解。 CFD模型还通过平衡模型扩展，以从液态合金中形成颗粒。包括六个杂质元素和三个粒子相（B，Al，C，N，O，Fe和SiC，Si_3N_4，SiO_2粒子）。完整的CFD模型可以预测局部杂质和颗粒浓度，该浓度与熔体中由密度梯度驱动的流动完全耦合。给出了一个示例模拟的结果，该结果涵盖了固化之前的保持时间和固化时间。通过一些实验观察到的趋势定性地证实了该结果。此外，结果表明，在保持期间杂质的吸收相当大（特别是对于氮和氧）。

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