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Epitaxial Pb(Zr0.2Ti0.8)O3 (PZT) thin films were grown on single crystalline Nb-doped SrTiO3 (STON) substrates by pulsed laser deposition (PLD). The top electrode was SrRuO3. 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+-p junction at the STON-PZT interface is suggested.