Localized vibrational modes of Al paried with Cu, Ag, or Au in ZnSe

Abstract

Infrared absorption bands attributable to the localized vibrational modes of pair defects of Al with the elements Cu, Ag, and Au in ZnSe have been observed. A comparison with CdTe containing these same impurities shows some major similarities in the defect structures. The proposed defects for ZnSe, their point‐group symmetries, and the vibrational frequencies in cm⁻¹ at 80 °K are as follows: Al_Zn, T_d, 359; Al_Zn‐Cu_Zn, C_s, 348, 351.5, 377; Al_Zn‐Ag_i or Al_Zn‐Ag_Se, C_3v, 349.5, 381; Al_Zn‐Au_Zn, C_s, 345, 348, 381. The dopants Cu, Ag, and Au were introduced by saturation diffusions into ZnSe:Al.