When a piece of pure silicon is doped with aluminium, then

Indresh Gehalot • 10.11K Points
Tutor II Physics

Q. When a piece of pure silicon is doped with aluminium, then

(A) the conductivity of the doped silicon piece will remain the same
(B) the doped silicon piece will become n-type
(C) the doped silicon piece will become p-type
(D) the resistivity of the doped silicon piece will increase

Correct Answer - Option(C)

Explanation by: Indresh Gehalot

p type of semiconductor is obtained when Silicon is doped with a trivalent impurity like Aluminium. Aluminium is a p-type dopant, which means that when a semiconductor i.e. silicon is doped with aluminium, it creates a hole (positively charged carrier) by accepting an electron from the silicon atom. Electrical conductivity of semiconductors increasesand resistivity remains the same

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