Fabrication of Oxide Thermoelectric Module Consisting of Multi-Layered Thick Films

摘要

We report the fabrication and thermoelectric properties of a multi-layered unicouple of [Ca{sub}2CoO{sub}(3-δ)]{sub}0.62CoO{sub}2 (Ca349; p-type) and Ca{sub}0.9La{sub}0.1MnO{sub}(3-δ)(Mn113; n-type). The multi-layered thick films consisting of Ca349, Mn113 and Al{sub}2O{sub}3 were prepared using an Electrophoretic deposition (EPD) method, In particular, the Ca349 layer was deposited under a magnetic field of 3 T and strongly c-axis-grain-oriented microstructure was obtained. The unicouple of hot-forged Ca349 and Mn113 layers generated 85 mV of voltage in △T ～ 450 K and, however, showed remarkably high internal resistance due to porous microstructure of the Mn113 layer. The development of a densification process for the n-type layer is an important for improving higher power density.