How can we identify electron affinity, effective conduction or valance band density of states and relative permittivity from DFT data?

18 March 2023 0 6K Report

I have done DFT calculation of a perovskite material (KGeI3) with CASTEP code. I want to find out its electron affinity, effective conduction or valance band density of states and relative permittivity. There is no experimental data available for KGeI3. Therefore, I need to find it theoretically. Can anyone suggest me how to calculate these properties for KGeI3 perovskite?

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