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Non-stoichiometric cuprous oxide (Cu(2)O...

Non-stoichiometric cuprous oxide `(Cu_(2)O)` can be prepared in the laboratory. In this oxide, copper to oxygen ratio is slightly less than `2:1`. Can you accound for the fact that this substance is a p-type semi-conductor ?

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Since copper to oxygen ratio is slightly less than `2:1` in `Cu_(2)O`, this shows that some `Cu^(+)` ions have been replaced by `Cn^(2+)` ions. Since the crystal has to be electrically neutral, one `Cu^(2+)` ions replaces every two `Cu^(+)` ions. As a result, a hole is created in each such case which is responsible for electrical conduction. This results in p-type semiconductor.
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