High-temperature thermoelectric properties of nanostructured Ca 3Co4O9 thin films

Min Gyu Kang, Kwang Hwan Cho, Seung Min Oh, Jin Sang Kim, Chong Yun Kang, Sahn Nahm, Seok Jin Yoon

Research output: Contribution to journalArticlepeer-review

40 Scopus citations


We prepared nanostructured Ca3Co4O9 (CCO) thin films by promoting localized epitaxial growth on polycrystalline Al 2O3 substrates. The thermoelectric properties of the CCO films were studied in the temperature range 300 to 1023 K. We confirmed that localized epitaxial growth occurred on the seed grains that dominate the (006) plane. The nanostructured CCO thin films were found to have a maximum Seebeck coefficient of 206 μV/K and a power factor (at 920 K) of 0.514 mW/ mK 2. Moreover, the presence of nanostructure was found to reduce the thermal conductivity, and thus, should enhance the overall performance of CCO films in thermoelectric devices.

Original languageEnglish (US)
Article number142102
JournalApplied Physics Letters
Issue number14
StatePublished - Apr 4 2011

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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