Alternating current impedance and Raman spectroscopic study on electrochromic a-WO{sub 3} films

Journal Article · Mon Jun 26 04:00:00 EDT 2000 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.126817· OSTI ID:20216824

Lee, Se-Hee ^[1]; Cheong, Hyeonsik M ^[1]; Tracy, C Edwin ^[1]; Mascarenhas, Angelo ^[1]; Pitts, J Roland ^[1]; Jorgensen, Gary ^[1]; Deb, Satyen K ^[1]

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1. National Renewable Energy Laboratory, Golden, Colorado 80401 (United States)

The chemical diffusion of lithium ions in a-Li{sub x}WO{sub 3} films is investigated using alternating current impedance spectroscopy and Raman scattering measurements. The diffusion coefficients increase with increasing x in a-Li{sub x}WO{sub 3} up to x=0.072 and then decrease. Raman measurements show that the W{sup 6+}=O/O-W{sup 6+}-O ratio also increases at the early stage of lithium insertion and then decreases with further lithium insertion. We conclude that the diffusion kinetics of lithium ions in a-Li{sub x}WO{sub 3} films is very closely related to the W{sup 6+}=O/O-W{sup 6+}-O ratio. (c) 2000 American Institute of Physics.

• OSTI ID: 20216824
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 26 Vol. 76; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALTERNATING CURRENT
AMORPHOUS STATE
DIFFUSION
ELECTROCHROMISM
EXPERIMENTAL DATA
IMPEDANCE
LITHIUM IONS
RAMAN SPECTRA
THIN FILMS
TUNGSTEN OXIDES