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A comparative study of chalcopyrite-related Cu 2 In 7 Se 11.5 and CuIn 5 Se 8 crystals by spectroscopic ellipsometry is presented. Their complex dielectric function ɛ(ω)=ɛ 1 (ω)+iɛ 2 (ω) has been determined in the 0.8–4.7eV photon energy range. The spectral dependence of ɛ 1 (ω) and ɛ 2 (ω) as well as the complex refractive index,...
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