To clarify the thermoelectric properties of the layered cobalt oxide Ca3Co4O9 epitaxial film fabricated by the topotactic ion-exchange method [K. Sugiura et al., Appl. Phys. Lett. 89, 032111 (2006)], the electrical resistivity (p), Hall coefficient (RH), and Seebeck coefficient (S) of high quality Ca3Co4O 9 epitaxial film were examined over the temperature range 10-1000 K. The film exhibited a low ρ of 4.0 × 10-3 Ω cm and a large S of ∼200μVK-1. which leads to the thermoelectric power factor of 1.0 × 10-3 W m-1 K-2, at 1000 K. Furthermore, the film exhibited good thermal stability at 1000 K in air.
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