Micro-structures and optical properties of PbZr_0.4Ti_0.6O₃ multilayer films deposited on FTO-coated glass substrate

PbZr_0.4Ti_0.6O₃ multilayer films with 16 periods deposited on the FTO-coated glass substrates were fabricated by using chemical solution deposition method. The micro-structures and optical properties of the multilayer films were investigated. The multilayer films exhibit a smooth, dense and crack-free surface morphology while having a layered structure consisting of dense and porous PbZr_0.4Ti_0.6O₃ layers. The multilayer films show a single perovskite structure. The reflectance and transmittance spectra in the wavelength range of 350~900nm at room temperature display an optical reflection-band centered at 450nm, with a peak reflectivity of 91% and a stop-band width of 41nm, and a transmission valley at 450nm with the same band-width as the reflection band. The minimum of the transmittance is less than 6% in the valley. This investigation is helpful to enlarge the application scale of ferroelectric multilayer films.