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Spectral dependence of the pseudodielectric function ε (E) = ε1 (E) +i ε2 (E) as well as of the complex refractive index, extinction coefficient, absorption coefficient, and normal-incidence reflectivity of Cu2 In4 Se7 and Cu Ga3 Se5 ordered vacancy compound crystals are modeled in the 0.8-4.4 eV photon energy range using a modification of Adachi's model [T. Kawashima J. Appl. Phys. 84, 5202 (1998)] for optical properties of semiconductors. Model parameters are determined using the acceptance- probability-controlled simulated annealing method. Excellent agreement with experimental data is obtained; the relative errors for the real ε1 and for imaginary ε2 part of the dielectric function are equal to 0.9%-1.5% and 3.2%-4.1% for the studied compounds. © 2007 American Institute of Physics.Peer Reviewe

Modeling the optical constants of Cu2In4Se7 and CuGa3Se5 crystals