Enhanced photoelectric properties for BiZn0.5Zr0.5O3 modified KNN-based lead-free ceramics

Abstract

With the increasing demand for transparent pulse capacitors and elector-optical multifunctional devices, the environmental-friendly K 0.5 Na 0.5 NbO 3 (KNN) based transparent dielectric ceramic has attracted extensive attention, not only for its superior energy storage properties but also for its good optical transparency. However, simultaneously improving the electrical and optical properties of KNN-based ceramics is still challenging. In this study, a new design strategy is proposed to enhance the electrical and optical properties of KNN-based ceramics. The strategy is reducing the grain size, breaking the long-range polar ordering to form disordered polar nanoregions (PNRs), and increasing the bandgap energy. The results showed that high effective storage ( W rec = 2.56 J/cm 2 ) and energy storage efficiency ( η = 93 %) are achieved, and the bandgap reaches 3.16 eV and optical transmittance of 73 % at the wavelength of 1200 nm and 67 % at the wavelength of 800 nm simultaneously implemented in the (1- x )K 0.5 Na 0.5 NbO 3 - x BiZn 0.5 Zr 0.5 O 3 ((1- x )KNN- x BZZ) ceramics. The design strategy strategies proposed in this study provide a novel way to improve the electrical and optical properties of transparent pulse capacitors.