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Preparation of Epitaxial Metallic LaNiO3 Thin Film by Polymer Assisted Deposition

LaNiO3 (LNO) has recently attracted great interest, as promising materials in ferroelectric super lattices, super conductive hetero structures and catalysts. Herein, a facile and low-cost polymer assisted deposition (PAD) method is realized to prepare epitaxial LNO thin films on (001) orientated of SrTiO3 (STO) with excellent conductivity. Various structural and electrical characterizations were carried out to investigate the film. The X-ray diffraction reveals that the film has good crystallinity with a full-width at half-maximum value of 0.38° from the rocking curve for the (002) reflection. High resolution XRD φ-scans were carried out to further confirm the heteroepitaxial growth of LNO film on STO substrate. And the result shows that there are four peaks separated by 90°, showing that the LNO thin film is cubic-on-cubic grown on STO substrate. In-situ high temperature XRD measurement was carried out to show the epitaxial growth of LNO thin film on STO substrate. And the result shows that metal cations can be released orderly on the monocrystalline substrate and epitaxial crystallization occurs after the decomposition of polymer. XPS results indicate that LaNiO3 thin film fabricated by PAD do not have oxygen vacancies and it is stoichiometric. The atomic force microscopy analysis shows smooth surface with the root-mean-square surface roughness of 0.67 nm. The resistivity as functions of temperature reveals that it has good conductive property from 10 K to 300 K. All results demonstrate that the LaNiO3 thin films deposited by PAD have better comprehensive performance, indicating that PAD method has great potential for preparing epitaxial functional thin film materials.