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Katzenmeier L, Carstensen L, Schaper SJ, Müller-Buschbaum P, Bandarenka AS. Characterization and Quantification of Depletion and Accumulation Layers in Solid-State Li + -Conducting Electrolytes Using In Situ Spectroscopic Ellipsometry. Adv Mater 2021; 33:e2100585. [PMID: 33955614 DOI: 10.1002/adma.202100585] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 03/08/2021] [Indexed: 06/12/2023]
Abstract
The future of mobility depends on the development of next-generation battery technologies, such as all-solid-state batteries. As the ionic conductivity of solid Li+ -conductors can, in some cases, approach that of liquid electrolytes, a significant remaining barrier faced by solid-state electrolytes (SSEs) is the interface formed at the anode and cathode materials, with chemical instability and physical resistances arising. The physical properties of space charge layers (SCLs), a widely discussed phenomenon in SSEs, are still unclear. In this work, spectroscopic ellipsometry is used to characterize the accumulation and depletion layers. An optical model is developed to quantify their thicknesses and corresponding concentration changes. It is shown that the Li+ -depleted layer (≈190 nm at 1 V) is thinner than the accumulation layer (≈320 nm at 1 V) in a glassy lithium-ion-conducting glass ceramic electrolyte (a trademark of Ohara Corporation). The in situ approach combining electrochemistry and optics resolves the ambiguities around SCL formation. It opens up a wide field of optical measurements on SSEs, allowing various experimental studies in the future.
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Affiliation(s)
- Leon Katzenmeier
- Physics of Energy Conversion and Storage Department of Physics, Technische Universität München, James-Franck-Str. 1, Garching, 85748, Germany
- Bayerisches Zentrum für Angewandte Energieforschung, Magdalene-Schoch-Str. 3, Würzburg, 97074, Germany
| | - Leif Carstensen
- Physics of Energy Conversion and Storage Department of Physics, Technische Universität München, James-Franck-Str. 1, Garching, 85748, Germany
| | - Simon J Schaper
- Lehrstuhl für Funktionelle Materielien Physik-Department, Technische Universität München, James-Franck-Str. 1, Garching, 85748, Germany
| | - Peter Müller-Buschbaum
- Lehrstuhl für Funktionelle Materielien Physik-Department, Technische Universität München, James-Franck-Str. 1, Garching, 85748, Germany
- Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Lichtenbergstr. 1, Garching, 85748, Germany
| | - Aliaksandr S Bandarenka
- Physics of Energy Conversion and Storage Department of Physics, Technische Universität München, James-Franck-Str. 1, Garching, 85748, Germany
- e-conversion Excellence Cluster, Lichtenbergstr. 4, Garching, 85748, Germany
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Westermeier C, Fiebig M, Nickel B. Mapping of trap densities and hotspots in pentacene thin-film transistors by frequency-resolved scanning photoresponse microscopy. Adv Mater 2013; 25:5719-5724. [PMID: 23798377 DOI: 10.1002/adma.201300958] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2013] [Revised: 05/03/2013] [Indexed: 06/02/2023]
Abstract
Frequency-resolved scanning photoresponse microscopy of pentacene thin-film transistors is reported. The photoresponse pattern maps the in-plane distribution of trap states which is superimposed by the level of trap filling adjusted by the gate voltage of the transistor. Local hotspots in the photoresponse map thus indicate areas of high trap densities within the pentacene thin film.
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Affiliation(s)
- Christian Westermeier
- Fakultät für Physik 8 CeNS, Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1, 80539, Munich, Germany
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