Journal of the Ceramic Society of Japan
Online ISSN : 1348-6535
Print ISSN : 1882-0743
ISSN-L : 1348-6535
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Preparation of Li–Co–O film by metal organic chemical vapor deposition
Hirokazu KATSUIYuji YAMASHITARong TUTakashi GOTO
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JOURNAL FREE ACCESS

2013 Volume 121 Issue 1413 Pages 406-410

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Abstract

LiCoO2 films were prepared on polycrystalline Al2O3 substrates by metal organic chemical vapor deposition (MOCVD), and the effect of the Li to Co source vapor ratio (RLi/Co) and substrate temperature (Tsub) on the phases, orientation, morphology, and deposition rates were investigated. At RLi/Co > 2.0, Li2CO3, LixCo1−xO, and a LiCoO2–CoO solid solution were co-deposited with LiCoO2, whereas Co3O4 was co-deposited with LiCoO2 at RLi/Co < 0.7. Single-phase LiCoO2 films were obtained in the RLi/Co range of 0.7–2.0 at Tsub > 873 K. Rutherford backscattering spectrometry revealed that single-phase LiCoO2 film had uniform and stoichiometric composition. The orientation of single-phase LiCoO2 films changed from (003) to (104) and (012) with increasing Tsub at RLi/Co ~ 1.0. LiCoO2 film co-deposited with Co3O4 at RLi/Co = 0.4 showed significant (101) orientation. The (003)-oriented LiCoO2 had a flat surface with hexagonal faceted texture, whereas the (101)- and (104)-oriented LiCoO2 had platelet grains in which the plate faces were tilted relative to the substrate surface. The highest deposition rate of single-phase LiCoO2 film was 10–20 µm h−1, which was 100 times greater than that reported in the literature.

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© 2013 The Ceramic Society of Japan
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