As we know, one of the best estimation methods for valence band and conduction band energies of semiconductors is using electronegativity of elements. In the enclosed power point file, we summarized the equations applied for this purpose and justified using the below mentioned reference. Please give your experience about these equations and ideas about this method or other alternative methods for calculations of these band energies. For more information, please refer to the following good reference:
Xu, Y. and Schoonen, M.A.A. (2000), The absolute energy positions of conduction and valence bands of selected semiconducting minerals. American Mineralogist, 85, 543-556.