Electric and ferroelectric properties of Pb(Zr/sub 0.2/Ti/sub 0.8/)O/sub 3/ thin films deposited by pulsed laser deposition on single crystalline substrates

Epitaxial Pb(Zr/sub 0.2/Ti/sub 0.8/)O/sub 3/ (PZT) thin films were grown on single crystalline Nb-doped SrTiO/sub 3/ (STON) substrates by pulsed laser deposition (PLD). The top electrode was SrRuO/sub 3/. The investigated electric and ferroelectric properties have revealed a strong asymmetry of the two PZT-electrode interfaces. A qualitative explanation based on the possible existence of a n/sup +/-p junction at the STON-PZT interface is suggested.