Journal
JAPANESE JOURNAL OF APPLIED PHYSICS
Volume 47, Issue 9, Pages 7556-7560Publisher
JAPAN SOC APPLIED PHYSICS
DOI: 10.1143/JJAP.47.7556
Keywords
titania nanosheet; Langmuir-Blodgett deposition; high-kappa dielectrics
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Langmuir-Blodgett (LB) deposition was employed to fabricate high-kappa dielectric nanofilms of titania nanosheets. The LB-based layer-by-layer approach using an atomically flat SrRuO(3) substrate is effective for the fabrication of atomically uniform and highly dense nanofilms. These films exhibited both high dielectric constant (kappa similar to 123) and low leakage current density (J < 10(-7) A cm(-2)) for thicknesses down to 5 nm, while eliminating the size-effect problems encountered in current high-kappa From analyses of interfacial structures by transmission electron microscopy and hard X-ray photoelectron spectroscopy. we have clarified that the films are composed of a well-ordered lamellar structure without an interfacial dead layer. According to first-principles calculations, a highly polarizable nature of titania nanosheets can bring improved dielectric properties. yielding high-kappa values even in an ultrathin geometry.
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