Influence of Residual Impurity on Optical Absorption in Hg_(0.8)Cd_(0.2)Te Crystal
剩余杂质对Hg_(0.8)Cd_(0.2)Te晶体光吸收的影响

The infrared transmission spectra of in getterec and ungettered Hg_(0.8)Cd_(0.2)Te sampleshave been compared. It is found that the long wave absorption was relatively reduced and theabsorption edges were moved to the short wave direction after gettering. The experimental phenomenahave been explained according to the process of residual impurity related optical absorption.In addition, the explaination has also been verified in acceptor doped Hg_(0.8)Cd_(0.2)Tewith mercury vacancies.