Dear I Explain my point of view : Using Wien2k code all calculations are done at 0 kelvin . So there is no thermal energy able to displace an electron from valence to conduction band. Conduction bands levels are therefore empty.if for example the Wien2k-estimated bandgap is of 2 eV so it is considered as semiconductor . so is it logical to speak of energy conduction level and wien2k calculates the density of charges /states in conduction band namely DOS and we know that at T=0k the material is insulator so no electron in conduction band.
my second question :with respect to semiconductor definition, it is conductor at ambient temperature so KT=25 meV . do you think that this energy it sufficent to displace the electron from VB to CB with Eg =2 eV.? Best regards Brik
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