When a piece of pure silicon is doped with aluminium, a trivalent element, what

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1. When a piece of pure silicon is doped with aluminium, a trivalent element, what results?

The doped silicon’s conductivity stays completely unchanged

The doped silicon becomes an n-type semiconductor

The doped silicon becomes a p-type semiconductor

The doped silicon’s resistivity simply increases

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Aluminium, having only three valence electrons, creates electron deficiencies, or holes, when it replaces silicon atoms in the lattice — producing a p-type semiconductor.