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Erschienen in:
29.08.2015
Influence of top contact noble metals on leakage current properties of epitaxial BaTiO3 film capacitors
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 12/2015
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Abstract
Dielectric properties, ferroelectric hysteresis loops, and leakage current characteristics of an epitaxial BaTiO3 (BTO) film were investigated with La0.5Sr0.5CoO3 as bottom electrode and the different noble metal as top electrodes (Au, Ag and Pt, which were deposited on the same surface of a BTO film). The dielectric constants, dielectric loss, leakage currents and ferroelectric loops all exhibited the top-electrode-dependent behavior, which can be attributed to the different interface state. The J–V characteristics were analyzed with various transportation mechanisms in detail. Regardless of the top electrode materials, the leakage current characteristics were described by a modified Schottky contact model for all BTO film capacitors. It was proved that large space charge densities were the main contribution to the slim hysteresis loops. The potential of these interface charge dominated BTO film heterostructures in the application of high energy density storage capacitors was also demonstrated.