A metal oxide shows p-type semiconductivity. | vedclass

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Question

(A) $p-$type semiconductivity in metal oxides is typically caused by metal deficiency defects. For example,in $NiO$,some $Ni^{2+}$ ions are replaced b

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Increasing the pressure of oxygen in contact with the oxide

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(A) $p-$type semiconductivity in metal oxides is typically caused by metal deficiency defects. For example,in $NiO$,some $Ni^{2+}$ ions are replaced by $Ni^{3+}$ ions to maintain electrical neutrality,creating cation vacancies. The reaction with oxygen is: $\frac{1}{2} O_2(g) \rightarrow O^{2-} + 2h^+ + V_{Ni}^{2-}$. Increasing the partial pressure of oxygen shifts the equilibrium to the right,increasing the concentration of $Ni^{3+}$ ions (holes),which increases the conductivity.

$A$ metal oxide shows $p-$type semiconductivity. The conductivity of the oxide will increase by:

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