Fig. 1. PVDF based piezoelectric devices (A) open-circuit voltage of a flexible PVDF-TrFe thin film energy harvester. Reproduced from ref. 87 with the permission of AIP Publishing. (B) PVDF-TrFE nano-array formation. Reproduced from ref. 97, with the permission of Springer Nature. (C) Open-circuit voltage of PVDF/SM-KNN energy harvester. (D) TEM image of the PVDF/SM-KNN composite. Reproduced from ref. 108, with permission from Elsevier.
