Optical property of amorphous semiconductor mercury cadmium telluride from first-principles study  

作　　者：WANG Liang CHEN XiaoShuang LU Wei HUANG Yan WANG XiaoFang ZHAO JiJun 

机构地区：[1]National Laboratory for Infrared Physics,Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai 200083,China [2]State Key Laboratory of Materials Modification by Laser,Electron,and Ion Beams,School of Physics and Optoelectronic Technology and College of Advanced Science and Technology,Dalian University of Technology,Dalian 116024,China

出　　处：《Science China(Technological Sciences)》2009年第7期1928-1932,共5页中国科学（技术科学英文版）

基　　金：Supported by the National Basic Research Program of China("973"Project)(Grant No.2007CB613205);the National Natural Science Foundation of China(Grant Nos.10725418,10734090,60576068);the Key Fund of Shanghai Science and Technology Foundation(Grant No.08JC1421100);the Knowledge Innovation Program of the Chinese Acad-emy of Sciences

摘　　要：The structural and optical properties of amorphous semiconductor mercury cadmium telluride (a-MCT) are obtained by the first principles calculations. The total pair distribution functions and the density of states show that the a-MCT has the semiconductor characteristic. The calculated results of dielectric function show that E2 peak of the imaginary of dielectric function for the crystal mercury cadmium telluride abruptly disappears in the amorphous case due to the long-range disorders. And the imaginary of dielectric function of a-MCT shows a large broad peak, which is in agreement with the available results of other amorphous semiconductors. From the linear extrapolation of the curve ωε 2(ω)1/2 versus ω, it can be obtained that the optical energy gap of amorphous semiconductor Hg0.5Cd0.5Te is 0.51±0.05 eV.The structural and optical properties of amorphous semiconductor mercury cadmium telluride (a-MCT) are obtained by the first principles calculations. The total pair distribution functions and the density of states show that the a-MCT has the semiconductor characteristic. The calculated results of dielectric function show that E 2 peak of the imaginary of dielectric function for the crystal mercury cadmium telluride abruptly disappears in the amorphous case due to the long-range disorders. And the imaginary of dielectric function of a-MCT shows a large broad peak, which is in agreement with the available results of other amorphous semiconductors. From the linear extrapolation of the curve ?ω? 2(ω)1/2 versus ?ω, it can be obtained that the optical energy gap of amorphous semiconductor Hg0.5Cd0.5Te is 0.51±0.05 eV.

关 键 词：FIRST-PRINCIPLES CALCULATIONS optical property DIELECTRIC function ABSORPTION COEFFICIENT 

分 类 号：TN304[电子电信—物理电子学]