Shear stress-induced enhancement of the piezoelectric properties of PVDF-TrFE thin films

• The highly ordered crystalline is important for the greater piezoelectric response.
• Piezoelectric properties of PVDF-TrFE can be enhanced by a high spin rate.
• Piezoelectric properties were degraded at excessively fast spin speed.
• Based on simulations, the aligned dipole can be maximized at a medium strain rate.
• The β-phase crystallinity also can be maximized at a medium strain rate.

Material properties of PVDF-TrFE related to dipole alignment and crystallinity, such as surface potential, polarization direction, piezoelectric coefficient, and remnant polarization, have been systematically examined to explain the improvement in the piezoelectric properties of PVDF-TrFE formed at a high spin-coating speed. The correlations between the distribution of the dipole moment vector and the degree of crystallinity were studied as a function of strain rate using a computational molecular dynamic simulation.

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