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

General Science (CDS) Physics

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

the conductivity of the doped silicon piece will remain the same

the doped silicon piece will become ntype

the doped silicon piece will become ptype

the resistivity of the doped silicon piece will increase

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Explanation:

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 increases and resistivity remains the same.