Flexible Piezoelectric Nanogenerators Based on P(VDF-TrFE)/CsPbBr₃ Quantum Dot Composite Films

Abstract

Benefiting from high flexibility and lightweight characteristics, flexible piezoelectric nanogenerators (PENGs) have the potential to become a ubiquitously available and sustainable alternative source of energy. Herein, we fabricated a poly(vinylidene fluoride−trifluoroethylene) (P(VDF-TrFE)) PENG doped with CsPbBr 3 quantum dots (QDs), which reveals a remarkable enhancement in piezoelectric output performance. PENGs doped with 0.3 wt % of CsPbBr 3 QDs exhibit an optimized piezoelectric coefficient from 15.5 to 24.5 pC N −1 , and the corresponding open-circuit voltage and short-circuit current are enhanced by 2.5 and 2.2 times, respectively, thanks to the increased β-phase content of the P(VDF-TrFE). The composite PENGs are sensitive to several human movements like bending, finger touch, and wind blowing, showing great potential for application in selfpowered sensing and energy harvesting. Moreover, fatigue test under continuous mechanical stimuli, and after long periods of rest (up to 2 months), demonstrates the PENG capabilities to be used as a robust mechanical energy harvester.

Ultra-Stable and Durable Piezoelectric Nanogenerator with All-Weather Service Capability Based on N Doped 4H-SiC Nanohole Arrays

“…The key performance of N doped 4H-SiC NHAs-based PENG is compared with PENGs constructed by various material systems, i.e., lead-based perovskite, lead-free perovskite, piezoelectric polymer and piezoelectric semiconductor (Table 1 ). Notably, the density of I sc of the PENG based on N doped 4H-SiC NHAs is basically the same as that of some PENGs assembled by classic piezoelectric materials, such as CsPbBr 3 /P(VDF-TrFE) [ 45 ], BiFeO 3 [ 46 ], ZnO [ 20 ] and GaN [ 21 , 22 ]. Most importantly, PENG based on N doped 4H-SiC NHAs possesses a wider service temperature range (− 80 ~ 80 °C), wider operating RH range (0 ~ 100%) and longer service life (50 days), indicating the all-weather service capability.…”

Recent Advances in Organic and Organic–Inorganic Hybrid Materials for Piezoelectric Mechanical Energy Harvesting

“…Reproduced with permission. [ 133 ] Copyright 2021, American Chemical Society and Reproduced with permission. [ 134 ] Copyright 2021 Wiley‐VCH.…”

“…Recently, Wang and co-workers reported a flexible piezoelectric nanogenerator comprising CsPbBr 3 quantum dots (QDs) doped with a poly(vinylidene fluoride−trifluoroethylene) P(VDF-TrFE) polymer (Figure 30). [133] Different concentrations of CsPbBr 3 QDs (0, 0.1, 0.2, 0.3, 0.4 and 0.5 wt%) were used to prepare a range of wt.% of composite films with P(VDF-TrFE). and c) output current of devices composed of pure PVDF (black), porous PVDF with ZnO nanoparticles (red) and FAPbBr 2 I@PVDF composites (blue).…”

Progress in Piezoelectric Nanogenerators Based on PVDF Composite Films

“…In this way, most of the F atoms are located on the same side of the carbon chain, similar to Figure 4a, which results in an improved β phase. Recently, we reported a poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) PENG doped with inorgarnic CsPbBr 3 quantum dots, and a remarkable improvement in piezoelectric output performance was revealed due to the increased β crystalline phase of the P(VDF-TrFE) [45]. Based on a one-step electrospinning method of solutions including CsPbBr 3 precursors and PVDF, we also fabricated CsPbBr 3 @PVDF composite nanofibers using an in situ growth technology, and the composite PENG displays better thermal/water/acid-base stabilities [46].…”