CdTe反常热膨胀系数和能隙的温度关系

TEMPERATURE DEPENDENCE OF THE ABNORMAL THERMAL EXPANSION COEFFICIENT AND THE BAND GAP IN CdTe

采用３个特征频率的声子模型，较好地拟合了ＣｄＴｅ的０～３０Ｋ反常线膨张系数α和０～３００Ｋ能隙ＥＲ的温度关系实验曲线，结果表明ＴＡ声子是导致ＣｄＴｅ低温线膨张系数反常的原因，能隙随温度的漂移主要受电子－ＴＡ声子相互作用的影响．

With the three-frequencey phonon model,the experimental curves of the temperature dependence of low temperature abnormal thermal linear expansion coefficient a (10￣30K) and direct band gap E.(10￣300k) of CdTe were successfully fitted.The results indicate that the low temperature abnormal thermal expansion coefficient of CdTe is due to TA phonon,and the band gap shift is mainly influenced by the electron-TA phonon Interaction.