High-temperature thermoelectric properties of nanostructured Ca3Co4O9 thin films

Title
High-temperature thermoelectric properties of nanostructured Ca3Co4O9 thin films
Authors
강민규조광환오승민김진상강종윤남산윤석진
Keywords
nano-structured; Ca3Co4O9; thin film
Issue Date
2011-04
Publisher
Applied physics letters
Citation
VOL 98, NO 14, 142102-1-142102-3
Abstract
We prepared nanostructured Ca3Co4O9 (CCO) thin films by promoting localized epitaxial growth on polycrystalline Al2O3 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/mK2 . 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.
URI
http://pubs.kist.re.kr/handle/201004/45617
ISSN
0003-6951
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KIST Publication > Article
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