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← ScienceWhich outcome impairs high-frequency GaN transistor performance because of unintended modulation?
A)Channel hot electron trapping worsens.✓
B)Kirk effect causes saturation velocity.
C)Shockley-Read-Hall lifetime extends.
D)Zener tunneling induces breakdown early.
💡 Explanation
Channel hot electron injection causes electron trapping within GaN's native defects and grain boundary energy levels: the gate bias becomes shielded near the drain. Therefore, increased GaN trapping reduces cutoff frequency earlier rather than the Kirk effect modulating the drift region width at high carrier densities.
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