Answer: Both mobile charge carriers (electrons and holes).
- A Electrons mainly, while holes remain freely mobile there
- B Holes mainly, while electrons remain freely mobile there
- C Both mobile charge carriers (electrons and holes)
- D All atoms, leaving a literal physical gap in the crystal
Correct answer: C. Both mobile charge carriers (electrons and holes)
Explanation: The depletion region forms where electrons and holes have recombined, leaving it depleted of free carriers.
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.