HOMO-LUMO are considered as valence-conduction bands as in inorganic semiconductors. what is the difference between them?
Main difference between HOMO-LUMO and VB-CB gaps is in the use of these terms. HOMO-LUMO gap is used for molecular materials like butene, hexene, benzene, etc. On the other hand, VB-CB gap is used for compact materials like Si, SiO2, TiO2, ZnO, etc.
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