The off-diagonal thermoelectric effect in inclinedly oriented thin films of layered cobaltite CaxCoO2
Year: 2010
Type: article
Abstract: The thermoelectric properties of inclinedly oriented thin films of layered cobaltite Ca x CoO 2 have been investigated in response to infrared lamp heating. Upon heating the film surface, anisotropic voltage signals were identified along the film in-plane directions, which showed a close relation to the inclined crystal orientation. We demonstrate that the anisotropic features are a clear representation of the unconventional off-diagonal thermoelectric effect, where a film out-of-plane temperature gradient generates a voltage signal in the film in-plane direction. Utilizing this effect, Ca x CoO 2 films allow us to produce film in-plane voltages of several hundred millivolts by a unit temperature differential in the film out-of-plane direction. The evident observation of the off-diagonal thermoelectric effect in the layered cobaltites shall renew the interest in this effect, which has so far been developed only in materials that are conventionally not regarded as thermoelectrics.
Institution: Panasonic (Japan)
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2013908946