UV-INDUCED CHANGES OF THE POLARIZATION PROFILE OF Pb(Zr,Ti)O₃ THIN FILMS

Abstract

Self-polarized lead-enriched Pb(Zr,Ti)O 3 films were deposited in which a fraction of the Zr sites are occupied by Pb 4+ ions. Peculiarities of photo-induced changes in the ferroelectric hysteresis and the pyroelectric coefficient profile of these films were investigated. UV illumination decreases the voltage required to reorient the domains and increases the spontaneous polarization. After illumination switch-off space charge layers of trapped electrons were formed and the switchable polarization was partially suppressed. The localization of the trapped space charges is determined by the light absorption coefficient.