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← ScienceWhich mechanism dictates electron flow through nanometer transistors?
A)Quantum tunnelling through potential barrier✓
B)Thermionic emission over the barrier
C)Drift current in the channel
D)Diffusion current at junctions
💡 Explanation
Quantum tunnelling is the mechanism that allows sizable electron flow in nanometer transistors due to barrier penetration. Because semiconductor dimensions are so small, tunnelling happens more efficiently than drift or thermionic emission, therefore, current occurs even with high gate voltages; rather than cutoff.
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