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Hefei Research Institute made progress in the study of ultra-high conductive oxide thin films
[ Instrument R & D of Instrument Network ] Recently, Zhu Xuebin, a researcher of the Functional Materials Laboratory of the Institute of Solid Physics, Hefei Academy of Material Sciences, Chinese Academy of Sciences, has made progress in ultra-high conductivity copper iron oxide thin films. It is the first report on the preparation of ultra-high conductivity epitaxial PtCoO2, PdCoO2 and PdCrO2 thin films by solution method. The related results were published in the journal Advanced Functional Materials under the title of Solution-Processable Epitaxial Metallic Delafossite Oxide Films.
Copperite oxides PtCoO2, PdCoO2, and PdCrO2 have higher room temperature conductivity than Pt, Pd, Al, and Au, and are considered to be the new benchmark for conductive oxide systems. More importantly, this type of material has many novel properties such as ultra-high Fermi speed, large orbital angular momentum, near-free electrons, Rashba type spin splitting, etc. However, because the +1 valence states of Pt and Pd are difficult to control, high-quality large-sized single crystals cannot be obtained, and high-quality thin films are difficult to prepare, which limits the application of such superconducting thin films in devices.
The research team successfully synthesized high-quality epitaxial PtCoO2, PdCoO2, and PdCrO2 thin films using a solution process, and the film size can reach more than 2 inches; this type of film has ultra-high room temperature conductivity (~ 300000 S / cm), which is currently reported The maximum value of the oxide film; at the same time, this type of film also shows excellent transparent conductive properties and hydrogen evolution performance. The related results provide an important reference for the synthesis and physical properties of high-performance ultra-high conductive oxide films.
The above research was supported by the National Natural Science Foundation of China.