Dear Abdelmounaim,
Defect in a semiconductor can cause to some different effects such as creation magnetic moment for dangling bonds of atoms that are situated near the defect. Also, defect play a role as a perturbation origin for energy levels and cause to disappearing degeneracy, so the energy band gap decreases or compound become a metal.
In the other hand, Sometimes defect in a semiconductor create some localized states above the Fermi level due to dangling bonds of defect area, so here the energy band gap decreases.
Or maybe some phenomena that I do not know about them.
Best Regards
Jaafar Jalilian
Dear Abdelmounaim,
I hope this paper will be useful for you, please click the below link.
https://www.researchgate.net/publication/264124268_Electronic_structure_of_BSb_defective_monolayers_and_nanoribbons
Sincerely yours
F.E
Article Electronic structure of BSb defective monolayers and nanoribbons
Dear Jaafar and dear Fatih, thak you very much for your help. your answers are very interesting.
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