Abstract Thin orthorhombic ultra high- k LuFeO 3 (LFO) films on Si 3 N 4 /SiO 2 /Si substrates were obtained by means of aqueous chemical solution deposition (CSD). Prior… Click to show full abstract
Abstract Thin orthorhombic ultra high- k LuFeO 3 (LFO) films on Si 3 N 4 /SiO 2 /Si substrates were obtained by means of aqueous chemical solution deposition (CSD). Prior to thin film deposition, the precursor synthesis, thermal decomposition and crystallization behavior of the bulk material were studied. It was shown that phase-pure hexagonal LFO powder could be formed at 650 °C while a higher temperature of 900 °C was required to obtain the orthorhombic phase. Deposition on SiO 2 /Si resulted in the development of silicates in this temperature range, thus preventing the formation of the orthorhombic LuFeO 3 phase. The use of Si 3 N 4 /SiO 2 /Si as the substrate shifted the silicate formation to higher temperature, allowing the synthesis of phase-pure orthorhombic LuFeO 3 as a thin film at 1000 °C. Impedance spectroscopy analyses confirmed its associated ultra high dielectric constant (>10,000) at room temperature for frequencies lower than or equal to 1 kHz.
               
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