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Cycling Endurance of SONOS Non-Volatile Memory Stacks Prepared with Nitrided SiO(2)/Si(100) Intefaces;Electron Device Letters

机译:用氮化siO(2)/ si(100)界面制备的sONOs非易失性存储器堆栈的循环耐久性;电子器件字母

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摘要

The effects of nitrided SiO(sub 2)/Si(100) interfaces upon cycling endurance in silicon-oxide- nitride-oxide-silicon (SONOS) non-volatile memory transistors are investigated. Analysis of MOSFET sub-threshold characteristics indicate cycling degradation to be a manifestation of interface state (D(sub it) ) generation at the tunnel oxide/silicon interface. After 10(sup 6) write/erase cycles, SONOS film stacks prepared with nitrided tunnel oxides exhibit enhanced cycling endurance with (Delta)D(sub it)=3x10(sup 12) V(sup -1)cm(sup -2), compared to (Delta)D(sub it)=2x10(sup 13) V(sup -l)cm(sup -2) for non-nitrided tunnel oxides. Additionally, if the capping oxide is formed by steam oxidation, rather than by deposition, SONOS stacks prepared with non-nitrided tunnel oxides exhibit endurance characteristics similar to stacks with nitrided tunnel oxides. From this observation it is concluded that latent nitridation of the tunnel oxidehilicon interface occurs during steam oxide cap formation.

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