Journal
IEEE TRANSACTIONS ON ELECTRON DEVICES
Volume 56, Issue 7, Pages 1499-1506Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TED.2009.2021444
Keywords
Chalcogenides; nonvolatile memories; phase-change memories
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In this paper, we investigate the effect of the reset-pulse parameters of a phase-change memory line cell on the electrical cell properties. By means. of electrothermal finite-element simulations and measurements, the characteristics of the reset state (resistance after switching, threshold voltage, and stability of the state) are related to the physical parameters during reset switching (the temporal and spatial distribution of the temperature during switching, the evolution of the melting and molten phases, and the time that the line is molten). From a device point of view, we emphasize the following aspects: 1) Due to good thermal isolation, the line cell can be reset using a 5-ns short current pulse of limited amplitude; 2) longer pulsewidths allow lower reset current amplitudes due to the gradual heating of surrounding dielectric; 3) the reset resistance has no direct relation with the threshold voltage but is strongly related to the number of reset pulses applied to the cell; and 4) shorter pulsewidths allow extended endurance lifetimes.
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