Optical Constants of Zn_<1-x>Cd_xTe Ternary Alloys : Experiment and Modeling

概要

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The optical spectra of Zn_<1-x>Cd_xTe ternary alloys in the 1.1 -5.6-eV photon-energy range at room temperature have been measured by spectroscopic ellipsometry (SE). The optical constants reported here are the complex dielectric constant (ε=ε_1+iε_2), complex refractive index (n^*=n+ik), absorption coefficient (α) and normal-incidence reflectivity (R). The measured data are analyzed on the basis of a simplified model of the interband transitions. The experimental data reveal distinct structures in the optical spectra at energies of the E_0, E_+Δ_0, E_1,E_1+Δ_1 and E_2 transitions, and are in reasonable agreement with the theoretical model. The model proposed here enables us to obtain the optical response in Zn_<1-x>Cd_xTe alloys of arbitrary composition (x) and photon energy (E=&plank;ω).
社団法人応用物理学会の論文
1993-08-15