Fabrication and electrical properties of sol-gel derived BaTiO3 films with metallic LaNiO3 electrode

Abstract

Metallic LaNiO3 (LNO) films were prepared on LaAlO3 (LAO) by metalorganic decomposition (MOD) and their application as the bottom electrode in sol-gel derived BaTiO3 (BTO) thin film was studied by means of x-ray diffraction, Raman spectroscopy, and scanning electron microscopy. BTO film on LNO-coated LAO exhibited preferred (100) orientation and smooth surface with fine grains (∼50 nm). Electrical measurements on BTO film capacitor showed good ferroelectric hysteresis, lower loss tangent and good insulating properties. These results indicated the BTO/LNO heterostructure fabricated by sol-gel and MOD technique to be a promising combination for microelectronic device applications.

Interface polarization coupling in piezoelectric-semiconductor ferroelectric heterostructures

“…24,30,31,75 The BTO coercive field ͑E c =11 kV/ cm͒ corresponds well to within typical values ͑1.5 to 50 kV/cm͒ for BTO thin layers reported previously. [68][69][70] Parameter N c is in agreement with electrical Hall and infrared ellipsometry measurements. 52 Due to the diodelike behavior of the heterostructure, different charge accumulation occurs at positive and negative bias.…”

“…Parameters obtained for P r , E c , and f are within the range of previously reported data. [68][69][70] The magnitude of P s is about two to four times smaller than typical values reported from bulk single-crystal measurements. Smaller values are often observed in polycrystalline film samples, where full saturation may not be reached due to limitations in applicable voltages without irreversible formation of electrical breakthroughs.…”

Dielectric properties and high tunability of (100)- and (110)-oriented (Ba0.5Sr0.5)TiO3 thin films prepared by pulsed laser deposition

“…Particularly, the orientation of thin films is known to be severely varied, depending on the type and material of bottom electrode [6,7]. The LaNiO 3 (LNO) electrode has been used as an oxide electrode with low lattice mismatch to many perovskite ferroelectric materials [8]. The similarities in crystal structural and lattice constants between the electrodes and BST films offer the benefits of better lattice matching and structural compatibility, and the potential for improved dielectric properties.…”

Optical properties of ferroelectric nanocrystal-containing polymer BaTiO3∕polycarbonate films

“…Here, BT films with grains of ϳ40-50 nm were prepared by sol gel. 12 The dielectric constant of PC rises very fast near T g ͑ϳ160°C͒. The dielectric constant of pure BT increases slowly until the temperature reaches 100°C near the Curie point of BT.…”