We report a dramatic property improvement of ferroelectric polymer poly(vinylidene fluoride/trifluoroethylene) [P(VDF-TrFE)] upon exposure to a plasma ambient. The P(VDF-TrFE) layer for typical nonvolatile memory devices shows only ∼6.5 μC/ cm2 and 0.55 MV/cm for its remnant polarization and coercive field, respectively, but the values increase to ∼13 xμC/ cm2 and ∼1 MV/cm after an optimum period of plasma exposure. Our infrared measurement confirms that the plasma energy creates many CC double bonds in the polymer chain while removing some of CF bonds, which are responsible for ferroelectric polarization. Nevertheless, the strengthened polymer can incorporate higher applied field, thereby aligning electric dipoles much better.
Bibliographical noteFunding Information:
Authors acknowledge the financial support from KOSEF (NRL program: Grant No. 2010-0000808), from the IT R&D Program for Smart window with transparent electronic devices, Grant No. 2006-S-079-05, and Brain Korea 21 Program. C. H. Park thanks for the Seoul Science Fellowship and Seoam Fellowship.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)