試題詳解

15. Consider energy bands in a crystal. Which of the following statements are correct?
(A) The conduction band of a metal is partially filled by electrons.
(B) Existence of energy gap is a manifestation of quantum mechanical phenomenon.
(C) Intrinsic semiconductors cannot conduct electricity at all even at high temperatures.
(D) Doped semiconductors can conduct electricity primarily with the carriers in the conduction band or holes in the valence band.
(E) All of the above. 注