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Indexed by:期刊论文

Date of Publication:2009-07-01

Journal:SCIENCE IN CHINA SERIES E-TECHNOLOGICAL SCIENCES

Included Journals:SCIE、EI

Volume:52

Issue:7

Page Number:1928-1932

ISSN No.:1006-9321

Key Words:first-principles calculations; optical property; dielectric function; absorption coefficient

Abstract: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.