1. 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
Option C Solution: 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.
