Inducing superior discharged energy density of the nanocomposite films with CsPbBr3 in-situ dispersed in ferroelectric polymer

Polymer-based capacitors are regarded as paramount components in advanced electrical systems due to their intrinsically superior breakdown strength ( E b ) and excellent processability. Although the enhancement of dielectric constant ( ε r ) of polymer-based composites has been realized by loading high‐ ε r inorganic fillers, this approach confronts considerable challenges in filler agglomeration. In this research, CsPbBr 3 (CPB) nanoparticles are via in-situ in ferroelectric polymers [P(VDF-HFP)] to form high-quality nanocomposites. ε r and E b of the nanocomposites are concomitant enhancement via introduction of only 0.1 wt% CPB, leading to an ultrahigh U d  ∼ 24.1 J cm −3 at 705 MV m −1 with superior efficiency ( η ) of 64 % and stability up to 2.5 × 10 4 charge–discharge cycles. COMSOL Multiphysics simulations further demonstrate that the in-situ prepared composites are conducive to inhibiting the growth of electric trees caused by inhomogeneous electric field distribution. This contribution extends the synthesis method to prepare perovskites-polymer dielectrics and provides a novel strategy for fabricating high-performance polymer-based composite capacitors.