温度梯度对碲锌镉单晶体生长过程热应力场的影响  

Effect of temperature gradient on thermal stress filed of CdZnTe bridgman crystal growth

作　　者：张国栋[1,2] 刘俊成[1] 

机构地区：[1]山东理工大学材料科学与工程学院,淄博255049 [2]莱芜职业技术学院机电工程系,莱芜271100

出　　处：《功能材料与器件学报》2009年第2期106-112,共7页Journal of Functional Materials and Devices

基　　金：国家自然科学基金(No.50372036);教育部新世纪优秀人才支持计划资助(No.NCET-04-0648)

摘　　要：采用单晶位错研究的热弹性模型,计算模拟了垂直布里奇曼法碲锌镉单晶生长过程中的热应力场,研究了炉膛温度梯度对晶体内热应力的影响。计算结果表明:径向上晶体边缘与坩埚壁接触位置处的热应力远大于晶体中心处的热应力;轴向上晶体底部位置的热应力远大于晶体顶部的热应力。在晶体底部边缘与坩埚接触的位置出现最大热应力值σmax。当炉膛温度梯度从5K/cm增加到20K/cm,晶体内的热应力显著提高,σmax从41.83MPa增加到79.88MPa;当温度梯度超过20K/cm进一步增加时,晶体内的热应力增加很少,σmax仅增加了约5.3%。The thermal stress field during CdZnTe Bridgman crystal growth was simulated with the thermal elastic model of single crystal dislocations. The effects of the furnace temperature gradients on the thermal stress of the CdZnTe crystal were investigated. The results showed that the thermal stress at the peripheral of the crystal is much larger than that in the center of the crystal in the radial direction, and the thermal stress near the bottom of the crystal is much larger than that at the top of the crystal in the axial direction. The maximal stress ＂σmax＂ appears near the peripheral of the crystal adhered with the inner wall of the crucible bottom. When the furnace temperature ranges from 5K/cm to 20K/cm, the thermal stress in the crystal increases significantly and σmax increases from 41.83MPa to 79.88Mpa. However, when the furnace temperature is above 20K/cm, the increase of the furnace temperature has a little influence to the thermal stress in the crystal and σmax increases only about 5.3%.

关 键 词：碲锌镉 晶体生长 热应力场 温度梯度 数值模拟 

分 类 号：TN304.053[电子电信—物理电子学] O782[理学—晶体学]