Open AccessOptical Properties of Al- and Sb-Doped CdTe Thin Films
Author(s) -
A.A.J. Al-Douri,
F. Y. Al-Shakily,
M. F. A. Alias,
A. Alnajjar
Publication year - 2010
Publication title -
advances in condensed matter physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.314
H-Index - 26
eISSN - 1687-8124
pISSN - 1687-8108
DOI - 10.1155/2010/947684
Subject(s) - materials science , dopant , doping , refractive index , dielectric , band gap , molar absorptivity , thin film , substrate (aquarium) , cadmium telluride photovoltaics , analytical chemistry (journal) , dielectric function , vacuum evaporation , evaporation , optics , optoelectronics , nanotechnology , chemistry , physics , oceanography , chromatography , geology , thermodynamics
Nondoped and (Al, Sb)-doped CdTe thin films with 0.5, 1.5, and 2.5 wt.%, respectively, were deposited by thermal evaporation technique under vacuum onto Corning 7059 glass at substrate temperatures () of room temperature (RT) and 423 K. The optical properties of deposited CdTe films such as band gap, refractive index (n), extinction coefficient (), and dielectric coefficients were investigated as function of Al and Sb wt.% doping, respectively. The results showed that films have direct optical transition. Increasing and the wt.% of both types of dopant, the band gap decrease but the optical is constant as n, and real and imaginary parts of the dielectric coefficient increase.
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