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Multibit memories using a structure of SiO2/partially oxidized amorphous Si/HfO2

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8 Author(s)
Park, Sangjin ; Samsung Advanced Institute of Technology, P.O. Box 111, Suwon 449-712, Korea ; Cha, Young-Kwan ; Cha, Daigil ; Youngsoo Park
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Memory capacitors with a structure of SiO2/partially oxidized amorphous Si (a-Si)/HfO2 have been prepared by sequential processes: atomic layer deposition (ALD) of 6 nm a-Si on 3.5 nm SiO2, thermal oxidation at 900 °C, and another ALD of 12 nm HfO2. The memory devices offer hybrid type of charge memory: the interface states of partially oxidized a-Si/SiO2 tend to act as hole traps, resulting in a negative shift of flatband voltage in capacitance-voltage (C-V) curve, and the partially oxidized a-Si/HfO2 interface has dominantly electron-trap centers, leading to a positive voltage shift. By this hybrid effect, the memory window in C-V curve is observed to be enlarged enough to realize four-level (2 bit) memories, which is demonstrated through measurements of program/erase speeds and charge-loss rates.

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Applied Physics Letters  (Volume:89 ,  Issue: 3 )