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GaAs is used in the fabrication of GUNN diodes because:

GaAs is used in the fabrication of GUNN diodes because: Correct Answer less forbidden energy gap

In GaAs, the conduction band lies directly above the top of the valence band. The lowest energy conduction band in GaAs is called as primary valley. GaAs consists of six secondary valleys. The bottom of one of the secondary valley is at an energy difference of 0.35 eV with the bottom of the primary valley in conduction band.

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