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Article

Controlling Phase Purity and Texture of K0.5Na0.5NbO3 Thin Films by Aqueous Chemical Solution Deposition

1
Department of Materials Science and Engineering, NTNU Norwegian University of Science and Technology, NO-7491 Trondheim, Norway
2
Department of Physics, NTNU Norwegian University of Science and Technology, NO-7491 Trondheim, Norway
*
Author to whom correspondence should be addressed.
Materials 2019, 12(13), 2042; https://doi.org/10.3390/ma12132042
Received: 14 May 2019 / Revised: 20 June 2019 / Accepted: 20 June 2019 / Published: 26 June 2019
(This article belongs to the Section Thin Films and Interfaces)
Aqueous chemical solution deposition (CSD) of lead-free ferroelectric K0.5Na0.5NbO3 (KNN) thin films has a great potential for cost-effective and environmentally friendly components in microelectronics. Phase purity of KNN is, however, a persistent challenge due to the volatility of alkali metal oxides, usually countered by using excess alkali metals in the precursor solutions. Here, we report on the development of two different aqueous precursor solutions for CSD of KNN films, and we demonstrate that the decomposition process during thermal processing of the films is of detrimental importance for promoting nucleation of KNN and suppressing the formation of secondary phases. Based on thermal analysis, X-ray diffraction and IR spectroscopy of films as well as powders prepared from the solutions, it was revealed that the decomposition temperature can be controlled by chemistry resulting in phase pure KNN films. A columnar microstructure with out-of-plane texturing was observed in the phase pure KNN films, demonstrating that the microstructure is directly coupled to the thermal processing of the films. View Full-Text
Keywords: KNN; thin film; aqueous chemical solution deposition KNN; thin film; aqueous chemical solution deposition
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MDPI and ACS Style

Helth Gaukås, N.; Dale, S.M.; Ræder, T.M.; Toresen, A.; Holmestad, R.; Glaum, J.; Einarsrud, M.-A.; Grande, T. Controlling Phase Purity and Texture of K0.5Na0.5NbO3 Thin Films by Aqueous Chemical Solution Deposition. Materials 2019, 12, 2042. https://doi.org/10.3390/ma12132042

AMA Style

Helth Gaukås N, Dale SM, Ræder TM, Toresen A, Holmestad R, Glaum J, Einarsrud M-A, Grande T. Controlling Phase Purity and Texture of K0.5Na0.5NbO3 Thin Films by Aqueous Chemical Solution Deposition. Materials. 2019; 12(13):2042. https://doi.org/10.3390/ma12132042

Chicago/Turabian Style

Helth Gaukås, Nikolai, Silje M. Dale, Trygve M. Ræder, Andreas Toresen, Randi Holmestad, Julia Glaum, Mari-Ann Einarsrud, and Tor Grande. 2019. "Controlling Phase Purity and Texture of K0.5Na0.5NbO3 Thin Films by Aqueous Chemical Solution Deposition" Materials 12, no. 13: 2042. https://doi.org/10.3390/ma12132042

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