Ultrafast phase-change logic device driven by melting processes

Desmond Loke, Jonathan M. Skelton, Wei Jie Wang, Tae Hoon Lee, Rong Zhao, Tow Chong Chong*, Stephen R. Elliott

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The ultrahigh demand for faster computers is currently tackled by traditional methods such as size scaling (for increasing the number of devices), but this is rapidly becoming almost impossible, due to physical and lithographic limitations. To boost the speed of computers without increasing the number of logic devices, one of the most feasible solutions is to increase the number of operations performed by a device, which is largely impossible to achieve using current silicon-based logic devices. Multiple operations in phase-change-based logic devices have been achieved using crystallization; however, they can achieve mostly speeds of several hundreds of nanoseconds. A difficulty also arises from the tradeoff between the speed of crystallization and long-term stability of the amorphous phase. We here instead control the process of melting through premelting disordering effects, while maintaining the superior advantage of phase-change-based logic devices over silicon-based logic devices. A melting speed of just 900 ps was achieved to perform multiple Boolean algebraic operations (e.g., NOR and NOT). Ab initio molecular-dynamics simulations and in situ electrical characterization revealed the origin (i.e., bond buckling of atoms) and kinetics (e.g., discontinuouslike behavior) of melting through premelting disordering, which were key to increasing the melting speeds. By a subtle investigation of the well-characterized phase-transition behavior, this simple method provides an elegant solution to boost significantly the speed of phase-change-based in-memory logic devices, thus paving the way for achieving computers that can perform computations approaching terahertz processing rates.

    Original languageEnglish
    Pages (from-to)13272-13277
    Number of pages6
    JournalProceedings of the National Academy of Sciences of the United States of America
    Volume111
    Issue number37
    DOIs
    Publication statusPublished - 16 Sept 2014

    Fingerprint

    Dive into the research topics of 'Ultrafast phase-change logic device driven by melting processes'. Together they form a unique fingerprint.

    Cite this