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V_{t} Retention Distribution Tail in a Multitime-Program MLC SONOS Memory Due to a Random-Program-Charge-Induced Current-Path Percolation Effect

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9 Author(s)
Yueh-Ting Chung ; Dept. of Electron. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan ; Tzu-I Huang ; Chi-Wei Li ; You-Liang Chou
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A Vt retention distribution tail in a multitime-program (MTP) silicon-oxide-nitride-oxide-silicon (SONOS) memory is investigated. We characterize a single-program-charge-loss-induced ΔVt in NOR-type SONOS multilevel cells (MLCs). Our measurement shows the following: 1) A single-charge-loss-induced ΔVt exhibits an exponential distribution in magnitudes, which is attributed to a random-program-charge-induced current-path percolation effect, and 2) the standard deviation of the exponential distribution depends on the program-charge density and increases with a program Vt level in an MLC SONOS. In addition, we measure a Vt retention distribution in a 512-Mb MTP SONOS memory and observe a significant Vt retention tail. A numerical Vt retention distribution model including the percolation effect and a Poisson-distribution-based multiple-charge-loss model is developed. Our model agrees with the measured Vt retention distribution in a 512-Mb SONOS well. The observed Vt tail is realized mainly due to the percolation effect.

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Electron Devices, IEEE Transactions on  (Volume:59 ,  Issue: 5 )