In a p-type semiconductor, the acceptor energy level is located:
-
A.
slightly below the valence band
-
B.
slightly above the valence band
-
C.
in the middle of conduction band and valence band
-
D.
slightly below the conduction band
Correct Answer:
B. slightly above the valence band
Explanation:
In a p-type semiconductor, the acceptor energy level is located slightly above the valence band. This positioning occurs because trivalent impurity atoms, such as boron or aluminum, create energy states within the forbidden gap that are very close to the top of the valence band. Because the energy difference is minimal, electrons from the valence band can easily transition into these acceptor levels with very little thermal energy. This process leaves behind vacant spaces, or holes, in the valence band, which serve as the primary charge carriers for electrical conduction. Placing the level near the valence band rather than the conduction band ensures that hole formation is the dominant mechanism for conductivity.
Click below to open Discussion & Feedback
0 Issues
Please
login to comment or Report Issues.