Investigation on Multifunctional Properties of (Pb0.92La0.08) (Zr0.55Ti0.45)O3 Relaxor Ferroelectric Thin Film for Energy‐Harvesting and Storage Applications

In this work, the dielectric, ferroelectric, energy storage, electrocaloric (EC), and pyroelectric properties of (Pb 0.92 La 0.08 )(Zr 0.55 Ti 0.45 )O 3 (PLZT) thin film (704 nm) are highlighted. The temperature‐dependent dielectric measurements reveal its relaxor behavior with an excellent tunability (≈64%) and a room‐temperature dielectric constant of ≈1670 at a frequency of 1 kHz. The film demonstrates a recoverable energy storage density of 16.13 J cm −3 and an efficiency of ≈67 %, under an applied field of ≈1915 kV cm −1 . The energy storage density of the film exhibits a room‐temperature fatigue endurance of 10 7 cycles, with a relative deviation of 13%. The EC temperature change (Δ T ) and entropy change (Δ S ) of 1.42 K and 3.88 J kg −1 K −1 , respectively, are measured at near room temperature at 33 MV m −1 . In addition, the film demonstrates a high pyroelectric coefficient of 304 μC m −2 K −1 at 293 K. These properties indicate the potential of PLZT film for high‐field energy storage, cooling, and energy‐harvesting applications.