Experimental evidence of tunable space-charge-layer-induced electrical properties of nanocrystalline ceria thin films

Title
Experimental evidence of tunable space-charge-layer-induced electrical properties of nanocrystalline ceria thin films
Authors
이경렬이종호류한일
Keywords
nanocrystalline; SOFC; ceria; space charge layer
Issue Date
2013-10
Publisher
Physical chemistry chemical physics : PCCP
Citation
VOL 15, NO 37, 15632-15636
Abstract
Fully dense nanocrystalline ceria films were successfully deposited on a MgO single crystal by pulsed laser deposition (PLD). The electrical conductivity of the nanocrystalline thin film was 20 times higher than that of the bulk sample. The activation energy of bulk ceria was 2.3 eV, whereas the activation energy of the nanocrystalline sample was only 1.2 eV. After post-annealing at 1273 K in which the grain size of the nanocrystalline thin film increased to ~400 nm, the electrical conductivity and activation energy of the film were changed similar to those of bulk. These unique electrical properties of the nano-crystalline thin-film can be attributed to the grain size effect, or more specifically, to the space charge layer (SCL) effect. Furthermore, the electrical conductivity of the nanocrystalline thin film became similar to that of the bulk in an extremely reducing atmosphere because of the unusual dependence of the SCL effect on the oxygen partial pressure.
URI
http://pubs.kist.re.kr/handle/201004/45816
ISSN
14639076
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KIST Publication > Article
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