Thickness dependence of ferroelectric polarization switching in poly(vinylidene fluoride-trifluoroethylene) spin cast films

Feng Xia, Haisheng Xu, Fei Fang, B. Razavi, Z. Y. Cheng, Yu Lu, Baomin Xu, Q. M. Zhang

    Research output: Contribution to journalArticlepeer-review

    83 Scopus citations

    Abstract

    In poly(vinylidene fluoride-trifluoroethylene) copolymer spin cast films, it has been observed that the polarization switching time increases as the film thickness is reduced to below 1 μm. We will show that this change with film thickness can be divided into two thickness regimes, i.e., those above 120-150 nm and those below that thickness. For films thicker than 120-150 nm, the change in the switching behavior is due to interface effects that can be modeled by an effective interface layer with lower dielectric constant that is in series with the film. For films below 120-150 nm thickness, there is an additional and very large increase of the switching time with reduced film thickness. This additional effect is caused by the precipitous drop of the crystallinity in films at this thickness range.

    Original languageEnglish (US)
    Pages (from-to)1122-1124
    Number of pages3
    JournalApplied Physics Letters
    Volume78
    Issue number8
    DOIs
    StatePublished - Feb 19 2001

    All Science Journal Classification (ASJC) codes

    • Physics and Astronomy (miscellaneous)

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