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← ScienceWhich field effect causes diminished gate control in gallium-nitride HEMTs?
A)Quantum tunneling of charge carriers
B)Drift velocity saturation of electrons
C)Piezoelectric polarization screening depletion✓
D)Impact ionization avalanche breakdown
💡 Explanation
Gate control decreases as piezoelectric polarization fields induce a depletion region limiting carrier concentration; therefore, polarization screening inhibits modulation capabilities, rather than electron saturation at high velocities because of other factors.
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