High-performance needle-shaped crystals in thin and ultrathin P(VDF-TrFE) films formed by melt recrystallization

作者：Kim Ju Han; Khang Dahl Young^*

来源：European Polymer Journal, 2014, 59: 78-83.

DOI：10.1016/j.eurpolymj.2014.07.017

• P(VDF-TrFE)
• Melt recrystallization
• Needle crystals
• PFM

The needle crystals, formed at high temperature annealing higher than melting point, in thin and ultrathin P(VDF-TrFE) ferroelectric films have been identified as high-performance ferroelectric elements in the films. Nanoscale piezoresponse force microscopy (PFM) imaging, spectroscopies, and lithographic writing on such individual needle crystal have clearly verified the good retention of ferroelectricity, while the non-needle surface does not. The surface coverage or areal density of such needle crystals has the same trend with the change of remenant polarization in samples, as a function of annealing temperature. Selective enrichment or separation of such needle crystals may open a novel way for high-performance devices based on P(VDF-TrFE).

• 出版日期2014-10