Answer: Trap levels in mid-gap.
- A Direct band-to-band recombination
- B Trap levels in mid-gap
- C Auger process
- D Phonon emission only
Correct answer: B. Trap levels in mid-gap
Explanation: SRH recombination: trap-assisted. Carrier captured by mid-gap trap, then recombines. Dominant in indirect-gap semiconductors like Si.
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.