Local Polarization Switching Kinetics in Thin-Film P(VDF-TrFE) (76:24) Studied by Time-Resolved LIMM

Extending the well-established Laser Intensity Modulation Method (LIMM) by a stroboscopic technique represents a new approach for obtaining polarization depth profiles at both high spatial (nanometer) and temporal (millisecond) resolution. Thin films of the archetypal organic ferroelectric copolymer P(VDFTrFE) are investigated in this manner to assess local switching kinetics. For subcoercive field conditions of 5MV/m, central regions of the 1μm thick samples show “bulk”-like, uniform polarization switching behaviour at a time-scale of 250 ms. In contrast, a 100 nm thick region near the metal-polymer interface reveals clear deviations from bulk switching kinetics, which likely reflects effects due to local charge generation/injection and trapping.

Publication year:2018

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Authors from:Higher Education

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