Question

The most widely used semiconductors are
(i) silicon (ii) germanium
(iii) phosphorus (iv) arsenic

• A. (i) and (ii)
• B. (ii) and (iii)
• C. (iii) and (iv)
• D. (i), (ii), (iv),(iii)

Answer 1

The correct option is A (i) and (ii)

Si and Ge are most widely used semiconductors because of their atomic structures. They have 4 electrons in valence shell which forms four covalent bonds with neighboring atoms in crystal lattice which can be altered by adding dopants.
Whereas, phosphorus and arsenides are dopants added to a pure semiconductor to increase their conductivity.