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A simple model is introduced which determines the optical band-gap energy Eg for penternary Cu(In(1−X)GaX)(SYSe(1−Y))2 (CIGSSe) alloys from its Ga∕(Ga+In) ratio as well as from its S∕(S+Se) ratio. In order to verify the model the depth dependent composition of a CIGSSe sample was revealed by elastic recoil detection analysis. Applying the model, the concentration profiles were transferred in an Eg profile. Finally, these values were compared with optical band-gap energies, which were obtained directly by independent characterization methods.
Bär et al. (Mon,) studied this question.