A bi-functional ferroelectric Pb(Zr0.52Ti0.48)O3 films: Energy storage properties and ferroelectric photovoltaic effects

Abstract In this work, we reported a bi-functional ferroelectric Pb(Zr 0.52 Ti 0.48 )O 3 (PZT) films which show energy storage properties and photovoltaic effects. The PZT films were crystallized into pure pseudo-cubic structure with the (001) preferred orientation. The polarization characterizations revealed a large recoverable energy storage density (∼11.2 J/cm 3 ) and a high energy conversion efficiency (∼68%) with good thermal stability (25 °C–100 °C) and fast response (>10 Hz). Meanwhile, the Pt/PZT/Pt capacitor presented a significant photovoltaic effect. The open circuit voltage and the short circuit current were -0.92 V and 139 μA/cm 2 at original state, respectively, while they were slightly increased to -1.01 V and 155 μA/cm 2 in polarization-up state, and slightly decreased to -0.77 V and 90 μA/cm 2 in polarization-down state. The maximum power conversion efficiency was enhanced one order of magnitude than that of polycrystalline PZT film reported elsewhere. Our study opens up a pathway toward developing bi-functional ferroelectric devices with simultaneously high energy storage density and high photovoltaic performance.