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Light absorption spectrum of pristine and metal‐doped (Ni, Mn) CsGeI3 perovskite as a function of a) photon energy dependent absorption coefficient, b) wavelength‐dependent absorption coefficient, c) reflectivity, d) conductivity, e) dielectric constant (real part), and f) dielectric constant (imaginary part). Reproduced with permission.305 Copyright 2018, Royal Society of Chemistry.
