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Pulse Dependent Threshold Voltage Variation of the Ovonic Threshold Switch in Cross-Point Memory.
- Source :
- IEEE Electron Device Letters; Mar2020, Vol. 41 Issue 3, p373-376, 4p
- Publication Year :
- 2020
-
Abstract
- We report the pulse dependent threshold voltage (${V} _{t}$) variation of the Ovonic Threshold Switch (OTS) and its effect on the read window margin (RWM) in Cross-Point Memory (XPM). We found that OTS ${V} _{t}$ varies by the height and width of the write-current pulse. The varied ${V} _{t}$ is persistently maintained even after 2E4 cycling of the write pulse, which means that the phenomenon is not a temporary one, but a type of memory effect in OTS itself. Therefore, it would affect the overall ${V} _{t}$ window ($\Delta {V}_{t}$) of XPM by changing the Set ${V} _{t}$ (${V} _{t\_{}{\text {Set}}}$) and Reset ${V} _{t}$ (${V} _{t\_{}{\text {Reset}}}$) when combined with either phase-change memory (PCM) or resistive memory (RM). High-resolution transmission electron microscopy (HRTEM) and fast Fourier transform (FFT) images have proved that this phenomenon is not caused by the phase change of the OTS. Instead, a sub-threshold analysis extracted from the Poole-Frenkel model suggests that the phenomenon is associated with the variation of the amorphous network either by changes in the atomic bonding configuration or trap density. [ABSTRACT FROM AUTHOR]
- Subjects :
- THRESHOLD voltage
FAST Fourier transforms
TRANSMISSION electron microscopy
MEMORY
Subjects
Details
- Language :
- English
- ISSN :
- 07413106
- Volume :
- 41
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- IEEE Electron Device Letters
- Publication Type :
- Academic Journal
- Accession number :
- 142008757
- Full Text :
- https://doi.org/10.1109/LED.2020.2969962