Abstract A stable thermal field and a controlled convex growth interface are essential for the stable growth of large-size CdZnTe crystals by the Traveling Heater Method (THM). However, the crucible wall temperature always increases due to the deposition of CdZnTe crystals with low thermal conductivity at the bottom of the crucible. A comprehensive two-dimensional simulation model for THM growth of CdZnTe is developed and implemented to study the heat and mass transfer. The effect of increasing wall temperature on interface shape and concentration distribution is discussed. Experimental results show that a dummy crystal with a thermal conductivity similar to that of the CdZnTe crystal helps to stabilize the wall temperature. In a stable thermal field, low constant rotation is assumed to be sufficient to weaken natural convection flow and to make the interface convex in THM. Simulation results show that low constant rotation rates of 2.5 RPM for 2-inch crystal and of 1.25 RPM for 3-inch crystal are effective in interface optimization. Several ingots with a diameter of 2 inches and 3 inches were grown by unseeded THM. Convex interfaces were observed both in 2-inch and 3-inch crystals by applying simulated rotation rates after fast cooling.

中文翻译：

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非晶种移动加热器法对 CdZnTe 晶体的热和界面优化研究

摘要 稳定的热场和受控的凸面生长界面对于通过移动加热器法 (THM) 稳定生长大尺寸 CdZnTe 晶体至关重要。然而，由于在坩埚底部沉积具有低热导率的 CdZnTe 晶体，坩埚壁温度总是升高。开发并实施了 CdZnTe 的 THM 生长的综合二维模拟模型来研究传热和传质。讨论了增加壁温对界面形状和浓度分布的影响。实验结果表明，导热系数与 CdZnTe 晶体相似的虚拟晶体有助于稳定壁温。在稳定的热场中，假设低恒定旋转足以削弱自然对流并使 THM 中的界面凸出。仿真结果表明，2 英寸晶体 2.5 RPM 和 3 英寸晶体 1.25 RPM 的低恒定旋转速率在界面优化中是有效的。几个直径为 2 英寸和 3 英寸的锭通过未接种的 THM 生长。通过在快速冷却后应用模拟旋转速率在 2 英寸和 3 英寸晶体中观察到凸界面。