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Which mechanism causes current flow through the gate oxide in a flash memory cell during a write operation?

A)Quantum tunneling through the insulator
B)Drift of ions within the oxide layer
C)Avalanche breakdown from high voltage
D)Thermionic emission over the barrier

💡 Explanation

During a write operation, electrons tunnel through the thin gate oxide layer due to quantum tunneling because of the high electric field, leading to charge storage on the floating gate. Therefore, quantum tunneling occurs, rather than drift, breakdown, or emission which require defects, higher voltages, or higher temperatures, respectively.

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