UV-Induced Ferroelectric Phase Transformation in PVDF Thin Films

Abstract
Thin films of polyvinylidene fluoride (PVDF) enable access to efficient hybrid devices that operate at low voltages. However, the preparation of thin films from solution typically yields nonferroelectric crystalline phases that require additional processing steps to transform the nonferroelectric phases to the more desirable ferroelectric polymorphs. Here, a rapid photonic annealing technique is reported that induces an α- to β-phase transformation in PVDF thin films, opening up the opportunity to process the material via high-throughput processing conditions such as roll-to-roll processing. This photonic annealing process uses a microsecond-scale light pulse to transform the spin-coated films into the desired ferroelectric PVDF phase. The structural evolution in these films is investigated under brief pulses of light, and it is shown that under optimal photonic annealing conditions, robust devices with a remnant polarization (P r) up to 5.4 µC cm−2 and a coercive field (E c) around 120 MV m−1 can be achieved.

Citation
Almadhoun MN, Khan MA, Rajab K, Park JH, Buriak JM, et al. (2018) UV-Induced Ferroelectric Phase Transformation in PVDF Thin Films. Advanced Electronic Materials: 1800363. Available: http://dx.doi.org/10.1002/aelm.201800363.

Acknowledgements
The authors would like to acknowledge Saudi Basic Industry Corporation (SABIC), Grant no. RGC/3/1094-01, the Canada Research Chairs program (CRC 207142), and NSERC (RGPIN-2014-05195).

Publisher
Wiley

Journal
Advanced Electronic Materials

DOI
10.1002/aelm.201800363

Additional Links
https://onlinelibrary.wiley.com/doi/full/10.1002/aelm.201800363

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