Pure silicon doped with phosphorus is:(A) Amorphous(B) p-type semiconductor (C) n-type semiconductor(D) Insulator

Pure silicon doped with phosphorus is a(n) (C) n-type semiconductor.

When pure silicon (Si) is doped with phosphorus (P), which is a group V element, it introduces extra electrons into the silicon crystal lattice. Phosphorus has five valence electrons, while silicon has four. The additional electron of phosphorus becomes a donor electron, as it is loosely bound to the atom. These donor electrons are free to move through the silicon lattice, increasing its conductivity.

As a result of the doping process, the silicon becomes an n-type semiconductor, where "n" stands for negative charge carriers (electrons). This is because the extra electrons provided by the phosphorus impurities dominate the behavior of the semiconductor, making it more conductive due to the availability of mobile charge carriers.