Flexible Piezoelectric Nanogenerators Based on P(VDF-TrFE)/CsPbBr<sub>3</sub> Quantum Dot Composite Films
Jiajia Nie, Laipan Zhu, Wenchao Zhai, Andy Berbille, Linlin Li, Zhong Lin Wang
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 CsPbBr3 quantum dots (QDs), which reveals a remarkable enhancement in piezoelectric output performance. PENGs doped with 0.3 wt % of CsPbBr3 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 self-powered 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.