Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 4, Pages 2929-2939Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am405508k
Keywords
ferroelectric; electrode interface; potential barrier; leakage current; hysteresis; capacitance
Funding
- Romanian Ministry of Education-Executive Unit for Funding High Education, Research, Development and Innovation (MEN-UEFISCDI) through the Idea-Complex Research [PN-II-ID-PCCE-2011-2-0006, 3/2012]
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Electrode interface is a key element in controlling the macroscopic electrical properties of the ferroelectric capacitors based on thin films. In the case of epitaxial ferroelectrics, the electrode interface is essential in controlling the leakage current and the polarization switching, two important elements in the read/write processes of nonvolatile memories. However, the relation between the polarization bound charges and the electronic properties of the electrode interfaces is not yet well understood. Here we show that polarization charges are controlling the height of the potential barriers at the electrode interfaces in the case of Pb(Zr,Ti)O-3 and BaTiO3 epitaxial films. The results suggest that the height is set to a value allowing rapid compensation of the depolarization field during the polarization switching, being almost independent of the metals used for electrodes. This general behavior open a new perspective in engineering interface properties and designing new devices based on epitaxial ferroelectrics.
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