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论文类型： 期刊论文

发表时间： 2009-07-01

发表刊物： SCIENCE IN CHINA SERIES E-TECHNOLOGICAL SCIENCES

收录刊物： SCIE、EI

卷号： 52

期号： 7

页面范围： 1928-1932

ISSN号： 1006-9321

关键字： first-principles calculations; optical property; dielectric function; absorption coefficient

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 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 A omega E > (2)(omega)(1/2) versus A omega, it can be obtained that the optical energy gap of amorphous semiconductor Hg(0.5)Cd(0.5)Te is 0.51 +/- 0.05 eV.