Piezoelectric vibration energy harvesters with stretched and multistacked organic ferroelectric films

Abstract

We investigated piezoelectric vibration energy harvesters with poly(vinylidene fluoride/trifluoroethylene) films and the improved power generation from using multistacked and stretched ferroelectric films on the cantilevers. The energy harvesters generated electric power with a resonant frequency approximately 25 Hz, which corresponded to the ambient vibration. The power density of four-layered harvesters was estimated to be 2.5 μW/mm 3 , which was quite larger than that of previous harvesters. The output power of stretched-film harvesters was 3.6 times the output obtained from unstretched films. Also, because organic ferroelectric films are flexible, the resonant frequency of each harvester was practically constant even when using the techniques of multistacking and stretching.

Surface modification and effects of organic ferroelectrics with blending hyperbranched polymer

“…4. [34][35][36][37] One peak at 1730 cm −1 , corresponding to FA-200, and some peaks in the 700-1500 cm −1 range, corresponding to P(VDF=TrFE), are observed. Both the pristine P(VDF=TrFE) and blended films before annealing are almost all composed of the all-trans conformation (form I), which indicates the ferroelectric state.…”

Multipoint detection of structural deformation of pulsating 3D heart model using flexible organic piezoelectric-sensor array

“…19) These devices were fabricated using an organic ferroelectric polymer, poly(vinylidene fluoride/trifluoroethylene) [P(VDF-TrFE)], which has been widely studied for its ferroelectricity, piezoelectricity, and pyroelectricity. [20][21][22][23][24][25][26] We demonstrated the potential of this single-sensor device to simultaneously perform vital sensing and electric power generation.…”

Hole Injection Characteristics and Annealing Temperature Dependence for Organic Light‐Emitting Diodes Using Spontaneous Polarization

“…In this study, poly (vinylidene fluoride-trifluoroethylene) [P(VDF/TrFE)] is used as a polar polymer with spontaneous polarization. [24][25][26][27] P(VDF/TrFE) is spin-coated on an ITO surface as a HIL. It does not affect the thickness of the OLED device because the P(VDF/TrFE) layer is ultrathinned by rinsing An efficient carrier injection at the electrode/organic semiconductor interface of organic light-emitting diodes (OLEDs) is challenging.…”