Journal
SOLID STATE COMMUNICATIONS
Volume 123, Issue 8, Pages 349-352Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0038-1098(02)00325-3
Keywords
thin films; optical properties; crystal and ligand fields; light absorption and reflection
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The d-d transition related to the Co-3d bands in LiCoO2 films shows a drastic change by the crystal-structural transformation from layered-rock-salt (hexagonal structure, ordered-distribution of Li and Co) to modified-spinet (cubic, random-distribution) structures. In the ordered-phase, a broad optical absorbance peak with a shoulder is observed around 2.1 eV, reflecting the density of states for the conduction-band related to two Co-3d(ev) bands. In the disordered-phase, the broad peak observed in the ordered phase sharpens and the shoulder disappears, showing the narrowing of Co-e(g) bands attributed to the higher lattice-symmetry of the cubic structure. These characteristics reflect the partial (complete) isolations of CoO6 clusters arising from the random-distribution of Li (Co) atoms in Co-rich (Li-rich) layers. (C) 2002 Elsevier Science Ltd. All rights reserved.
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