We know that in degenerate semiconductors like Indium Oxide and Zinc Oxide have an inherent defect i.e Oxygen vacancy and that defect level forms an Impurity band which then exceeds the conduction band to form a degeneracy. My question is how exactly does the every oxygen vacancy create two electrons ?
Rüdiger Mitdank
Dear Akhil,
An oxygen atom with 6 outer shell electrons (2s2 2p4) binds 2 outer shell Zn-electrons. This forms an octett. If you omit an oxygen atom, 2 Zn electrons (4s²) remain. These electrons move through the crystal and contribute to the impurity band.
With Regard
R. Mitdank
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