Q20 of 68 Page 30

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

Si doped with B.

‘Si’ belongs to group 14th in the periodic table and ‘B’ belongs to group 13th. Thus, when ‘Si’ is doped with “B’, it makes hole or electron valance and acts as p – type conductor.


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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:

Ge doped with In

 21

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

 22

In terms of band theory, what is the difference?

Between a conductor and an insulator