Self-poled and transparent polyvinylidene fluoride- co -hexafluoropropylene-based piezoelectric devices for printable and flexible electronics

, respectively, exhibiting a record-high improvement compared with previously reported PENGs. These ST-PENGs also offer significant promise in tracking human activity and recovering biomechanical energy. This study may provide insight into the development of transparent and flexible piezoelectric devices to achieve high-performance self-powered electronics.