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| Q. |
GaAs is used in the fabrication of GUNN diodes because: |
| A. | gaas is cost effective |
| B. | it less temperature sensitive |
| C. | it has low conduction band electrons |
| D. | less forbidden energy gap |
| Answer» D. less forbidden energy gap | |
| Explanation: 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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