Answer: 1.12 eV.
- A 0.67 eV
- B 1.12 eV
- C 2.34 eV
- D 0.3 eV
Correct answer: B. 1.12 eV
Explanation: Silicon band gap Eg ≈ 1.12 eV at 300K. Germanium: 0.67 eV. GaAs: 1.42 eV.
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.