Question: 19
(Choose 1 answer)
Which of the following is NOT correct about electron transition in semiconductor?
A. In a direct electron transition, an electron in the conduction band can fall to an empty state in the valence
band.
B. In an indirect electron transition, an electron in the conduction band minimum cannot fall directly to the
valence band maximum. It may go through some defect state (Et) within the band gap then fall to an empty
state in the valence band.
C. In an indirect electron transition, an electron in the conduction band minimum can fall directly to the valence
band.
D. In a direct electron transition, an electron in the conduction band can fall to an empty state in the valence
band, giving off the energy difference Eg as a photon of light.
