1. Determine Eg for the different compositions of the AlGaAs alloy.
Indicate if it is a direct band gap or an indirect band gap.
|Composition||Eg||Direct or Indirect|
2. What physical significance or consequence does the direct or indirect bandgap have (i.e., in terms of the light emission efficiency) ? Explain !
3. Would the Light Emitting Diodes and Laser Diodes be made from a direct
bandgap materials or from the indrect bandgap materials ?
(a) direct bandgap materials (b) indirect bandgap materials
4. Why is the indirect bandgap materials so inefficient compared with
the direct gap materials ? Explain !