Abstract
In this paper, we propose the single poly-Si Flash EEPROM device with a new structure which does not need the high voltage switching circuits. The device was designed, fabricated and characterized. From the measurement results, it was found that the program, the erase and the read operations worked properly. The threshold voltage was 3.1 V after the program in which the control gate and the drain were biased with 12 V and 7 V for , respectively. And it was 0.4 V after the erase in which the control gate was grounded and the drain were biased with 11 V for . On the other hand, it was found that the program and the erase speeds were significantly dependent on the capacitive coupling ratio between the control gate and the floating gate. The larger the capacitive coupling ratio, the higher the speeds, but the target the area per cell. The optimum structure of the cell should be chosen with the consideration of the trade-offs.
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