【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%。更多还原

【Abstract】 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%.更多还原