Answer: Toward conduction band.
- A Toward valence band
- B Toward conduction band
- C Does not shift
- D To mid-gap exactly
Correct answer: B. Toward conduction band
Explanation: N-type doping: extra electrons push Fermi level toward conduction band. P-type: Fermi level moves toward valence band.
Conductors have overlapping bands, semiconductors have a small energy gap that can be bridged by heat or doping, and insulators have a large gap that blocks conduction.
Concept context
Band theory, p-n junction, diodes, transistors, logic gates, and integrated circuits.