Large bias-induced piezoelectric response in the ferroelectric polymer P(VDF-TrFE) for MEMS resonators

Abstract

Piezoelectricity in ferroelectrics arises from electrostriction biased by their spontaneous polarisation, which can be enhanced through a bias-induced polarisation. Doing so, the piezoelectric response can be tuned and significantly enhanced. In this study, the ferroelectric polymer P(VDF-TrFE) was used to electro-mechanically excite a silicon microcantilever. Using this device, we demonstrate that a bias-induced polarisation improves the piezoelectric response of P(VDF-TrFE). To distinguish between the linear piezoelectric and quadratic electrostrictive effect, lock-in measurements were performed in order to separate the characteristic frequency response of both electro-mechanical phenomena. This work shows the potential for MEMS devices having controllable actuating and sensing properties. IMPACT STATEMENT The non-linear nature of the strong electrostrictive effect observed in ferroelectric polymers was used to enhance and control its piezoelectric activity by an electric field. A large and tunable piezoelectric response was verified in polymer-based MEMS resonators, proving the ability to tailor their actuating and sensing properties.

Piezoelectric Property Enhancement of PZT/Poly(vinylidenefluoride-co-trifluoroethylene) Hybrid Films for Flexible Piezoelectric Energy Harvesters

“…This phenomenon resulted from the formation of grain boundaries in the film, which scattered light, causing the film to appear foggy. the results have shown that an annealing temperature that is closer to the melting temperature causes the annealing treatment to be more effective at increasing the crystallinity of the film, this phenomenon is similar to other literature studies. − The β-phase content is the key influencing factor in a film’s piezoelectric response. Therefore, this experiment used FT-IR spectroscopy for quantitative analysis.…”

Highly Reliable Physical Bending Sensors using Heterostructured Floating Gate Organic Transistor

“…and Chen et al., this piezoelectric response can be significantly enhanced by an applied electric field, which was also applicable to our PVMFET. [ 58,59 ] To confirm this, we measured the electrical potential applied between source/drain electrodes and floating gate, namely V F , simultaneously under various applications of gate voltage and bending angle. Basically, in PVMFET, the V F generates an effective vertical electric field contributing to form FET channel.…”

A Mousepad Triboelectric-Piezoelectric Hybrid Nanogenerator (TPHNG) for Self-Powered Computer User Behavior Monitoring Sensors and Biomechanical Energy Harvesting

“…The outputs for the TPHNG are slightly higher than those for the neat TENG (V oc ~46 V, I sc ~1.4 µA), which indicates that there exists a coupling effect between the TENG and PENG in the hybrid system (Figure 3a,b). The phenomenon can be explained by the poled P(VDF-TrFE-CFE) in PENG producing intrinsic charges on both electrodes in PENG [37], which induces an initial charge accumulation on the copper trips in the TENG, resulting an enhancing effect similar to a charge injection [38]. On the other hand, the waveform patterns of sliding with the hybrid device are similar to those of the neat sliding mode TENG.…”