Variation of Energy Bands with Alloy Composition
- The band structures of the III-V ternary and quaternary compounds change as their composition is changed.
- There are 3 valleys in the conduction band:
(at k = 0), L, and X.
- In GaAs, the valley has minimum energy (direct with Eg= 1.43 eV) with very few electrons residing in the L and X valleys (except for the high field excitations).
- In the AlAs, X valley has minimum energy (indirect with Eg = 2.16 eV).
Figure- The E-k diagram of (a) GaAs and (b) AlAs, showing the three valleys (L, , and X) in the conduction band.
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