多场耦合诱导枝晶的生长和输运规律

项目名称： 多场耦合诱导枝晶的生长和输运规律

项目编号： No.51206069

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 工程热物理与能源利用学科

项目作者： 苏文佳

作者单位： 江苏大学

项目金额： 25万元

中文摘要： 大晶粒多晶硅铸锭的生长是制造低成本高效率太阳光伏电池的关键。利用磁场诱导、多场耦合的枝晶生长有助于获得大晶粒的铸锭。然而，枝晶生长中涉及的界面宏观和微观动力学特性，以及伴随枝晶生长的输运过程对晶粒尺寸的影响，决定了该过程的具体走向。本课题以磁场诱导枝晶生长大晶粒多晶硅过程中的晶体生长和输运行为为研究对象，基于描述原子运动过程的分子动力学和统计热力学理论，构建描述多场耦合过程多晶硅枝晶生长的微观动力学模型。采用理论分析、数值模拟和实验等手段，针对固/液界面附近硅原子团的存在形态和输运规律以及各种因素对初始形核时枝晶生长的影响规律进行分析研究，揭示多场耦合影响界面原子层生长和各种因素影响枝晶生长的本质原因。为基于磁场诱导枝晶生长的大晶粒多晶硅生长技术的定量表达及预测提供科学判据和技术基础。

中文关键词： 磁场诱导；枝晶生长；传热传质；多晶硅；大晶粒

英文摘要： The growth of large-grain multi-crystalline silicon ingot is the key to making cost-efficiency solar cells. The use of magnetic field and multi-field coupling in dendrite growth is favorable for large-grain ingot. However, the macro and micro dynamics characteristic on the interface and the transfer processes involved in the dendrite growth, which have great influence on the grain size, determines the specific direction of the process. On the basis of the molecular dynamics and statistical thermodynamic theory which give a description of atomic transfer process, the behaviors of crystal growth and the transfer are investigated for the study of dendrite growth induced by magnetic field in the growth process of large-grain multi-crystalline silicon in the subject, in order to construct the micro-dynamic model which describes the dendrite growth during the process of multi-crystalline silicon induced by multi-field coupling. Theoretical analysis, numerical simulation and experiment are used for the study of followings, including the morphology and transfer law of the silicon atoms near the solid/liquid interface, as well as the influence of various factors on the dendrite growth in the initial nucleation, thus can reveal the essential reasons of the effect of the interface atomic layer growth by multi-field couplin

英文关键词： Magnetic field induced；Dendrite growth；Heat and mass transfer；Multi-crystalline silicon；Large-grain