A

Admin • 802.91K Points
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Q. Direct band gap semiconductors ?

  • (A) Exhibit short carrier life time and they are used for fabricating BJT’s
  • (B) Exhibit long carrier life time and they are used for fabricating BJT’s
  • (C) Exhibit short carrier life time and they are used for fabricating Lasers
  • (D) Exhibit long carrier life time and they are used for fabricating BJT’s
Explanation by: Admin
In such semiconductors the transition from max point of valence band to minimum of conduction band takes place without change in momentum. Ex. GaAs They exhibit short carrier life time. Thus used for fabricating lasers. In DBG semiconductor during the recombination the energy is released in the form of light

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