Q20 of 68 Page 30

Classify each of the following as being either a p-type or a n-type semiconductor:

Ge doped with In

‘Ge’ belongs to group 14th in th periodic table and ‘In” belongs to the group 13th . thus, when ‘Ge’ is doped with ‘In’, it makes hole or electron vacancy and acts as p – type conductor.


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18

Non-stoichiometric cuprous oxide, Cu2O can be prepared in laboratory. In this oxide, copper to oxygen ratio is slightly less than 2:1. Can you account for the fact that this substance is a p-type semiconductor?

 19

Ferric oxide crystallises in a hexagonal close-packed array of oxide ions with two out of every three octahedral holes occupied by ferric ions. Derive the formula of the ferric oxide.

 20

Classify each of the following as being either a p-type or a n-type semiconductor:

Si doped with B.

 21

Gold (atomic radius = 0.144 nm) crystallises in a face-centred unit cell. What is the length of a side of the cell?