Journal
THIN SOLID FILMS
Volume 518, Issue 19, Pages 5447-5451Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2010.04.011
Keywords
Lithium iron phosphate; Thin films; Batteries; Pulsed laser deposition; Transmission electron microscopy
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LiFePO4 thin films were grown on silicon (100) substrates by pulsed laser deposition using Traditional Geometry (TG) and Off-Axis Geometry (OAG) deposition chambers. We examined and compared the structure and composition of the so formed thin films. The nails observed on the OAG-film present an amorphous body and a crystallized head. The Fe/P ratio determined using energy dispersive spectrometry combined with high angle annular dark field images reveals a metallic iron heart surrounded by LiFePO4 shell. On the other hand, the protuberances on TG-film are pure iron. The focused ion beam prepared cross-section of the film suggests the presence of iron particles and iron dendritic like filaments inside the LiFePO4 layer. (C) 2010 Elsevier B.V. All rights reserved.
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