Fig. 8
From: Impact of halide variation on the optoelectronic properties of double perovskites
Variation of (a) real dielectric constant \([\varepsilon _{1}(\omega )]\), (b) imaginary dielectric constant \([\varepsilon _{2}(\omega )]\), (c) absorption coefficient \([\alpha (\omega )]\), and (d) optical conductivity \([\sigma (\omega )]\) with a photon energy of \(Cs_{2}AgBiX_{6}\) (X = Br, Cl) compounds.
