Abstract
Hot-hole generation during electrical erase in flash memory cells was investigated and found to be strongly dependent on the lateral electric field of the gated diode junction. It is shown, by erasing the memory cell at a low source voltage in combination with a negative gate voltage, that the operating point can be chosen well away from the onset of avalanche. Using this erasing scheme appreciably reduces the amount of hole trapping in the tunnel oxide. As a result, data retention is significantly improved as compared with conventional erasure. >
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