Article,

Modeling of Phase-Change Memory: Nucleation, Growth, and Amorphization Dynamics during Set and Reset: Part II - Discrete Grains

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IEEE Transactions on Electron Devices, (2017)
DOI: 10.1109/TED.2017.2745500

Abstract

© 2017 IEEE. We extend our finite-element model of nucleation, growth, and amorphization in phase-change memory devices to model discrete nucleation and grain boundaries, including the evolution of grains within fully crystalline material during long-term anneals. Electrothermal simulations of set and reset operations include a heat of crystallization model and an Arrhenius expression modeling thermionic emission at grain boundaries. Our simulations capture cycle-to-cycle variations due to stochastic nucleation and the interplay of crystallization, the formation of percolation paths, and thermal runaway.

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