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Structural and optical properties of alumina passivated amorphous Si slanted columnar thin films during electrochemical Li-ion intercalation and deintercalation observed by in situ generalized spectroscopic ellipsometry
University of Nebraska Lincoln, NE 68588 USA.
University of Nebraska Lincoln, NE 68588 USA.
University of Nebraska Lincoln, NE 68588 USA.
Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, Faculty of Science & Engineering. University of Nebraska Lincoln, NE 68588 USA; Leibniz Institute Polymer Research Dresden, Germany.
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2017 (English)In: Journal of Vacuum Science & Technology B, ISSN 1071-1023, E-ISSN 1520-8567, Vol. 35, no 3, 031401Article in journal (Refereed) Published
Abstract [en]

The authors report on the structural and optical property changes of alumina passivated amorphous Si slanted columnar thin films during electrochemical Li-ion intercalation and deintercalation determined by in situ generalized spectroscopic ellipsometry. The cyclic voltammetry investigations versus Li/Li+ are performed at a rate of 1mV/s, while Mueller matrix generalized spectroscopic ellipsometry data are collected. Through a best-match model analysis utilizing the homogeneous biaxial layer approach, temporal anisotropic optical constants are obtained. The authors observe a strong anisotropic electrochromic response with maximum changes of similar to 18% in the anisotropic refractive indices and similar to 750% in the anisotropic extinction coefficients. Furthermore, the thin films reversibly expand and contract by similar to 35%. A comparative analysis of the temporal optical constant response to the changes in overall optical anisotropy of the electrode reveals six transient regions throughout the Li-ion intercalation and deintercalation cycle of the highly ordered three-dimensional nanostructures. The transients correspond to electrochemical potential regions which show limited charge transfer, metalization or demetalization, and swelling or deswelling of the nanostructures. Furthermore, the electrochemical potential regions in which the transients are observed here are very similar to those previously reported for Li-ion intercalation and deintercalation of silicon nanowires using structural analysis techniques, where four distinct phases of Li-Si alloy formation were revealed. The authors find that at low Li contributions, swelling and deswelling occur preferentially along the slanted columns, while at high Li contributions, swelling and deswelling occur preferentially within the intercolumnar space. (C) 2017 American Vacuum Society.

Place, publisher, year, edition, pages
A V S AMER INST PHYSICS , 2017. Vol. 35, no 3, 031401
National Category
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-138488DOI: 10.1116/1.4982880ISI: 000402053900015OAI: oai:DiVA.org:liu-138488DiVA: diva2:1111658
Note

Funding Agencies|National Science Foundation [EPS-1004094, CMMI 1337856, ECCS: 1542182]; J. A. Woollam Foundation; Department of Electrical and Computer Engineering; Nebraska Research Initiative

Available from: 2017-06-19 Created: 2017-06-19 Last updated: 2017-06-19

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