Topic: Electronic Devices
Silicon is not suitable for fabrication of light emitting diodes because it is
- A. An indirect band gap semiconductor
- B. A direct band gap semiconductor
- C. A wide band gap semiconductor
- D. A narrow band gap semiconductor
Answer: A. An indirect band gap semiconductor
Explanation: Since silicon is an indirect band gap semiconductor so electron cannot fall directly to the valence band but must undergo a momentum change as well as change in energy. So, energy is released as heat along with light, so not used.