Effect of interface and crystallinity on the ferroelectric properties of poly(vinylidene fluoride-trifluoroethylene) copolymer thin films

Feng Xia, H. S. Xu, Babak Razavi, Qiming Zhang

    Research output: Contribution to journalConference article

    1 Scopus citations

    Abstract

    Ferroelectric polymer thin films are attractive for a wide range of applications such as MEMS, IR sensors, and memory devices. We present the results of a recent investigation on the thickness dependence of the ferroelectric properties of poly(vinylidene fluoridetrifluoroethylene) copolymer spin cast films on electroded Si substrate. We show that as the film thickness is reduced, there exist two thickness regions. For films at thickness above 100 nm, the thickness dependence of the ferroelectric properties can be attributed to the interface effect. However, for thinner films, there is a large change in the ferroelectric properties such as the polarization level, the coercive field, and polarization switching speed, which is related to the large drop of the crystallinity in the ultrathin film region (below 100 nm). The results from X-ray, dielectric measurement, and AFM all indicate that there is a threshold thickness at about 100 nm below which the crystallinity in the film reduces abruptly.

    Original languageEnglish (US)
    Pages (from-to)407-412
    Number of pages6
    JournalMaterials Research Society Symposium - Proceedings
    Volume665
    StatePublished - Dec 1 2001
    EventElectronic, Optical and Optoelectronic Polymers and Oligomers - San Francisco, CA, United States
    Duration: Apr 17 2001Apr 20 2001

    All Science Journal Classification (ASJC) codes

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

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