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

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, howe...

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Main Authors:	Nikolai Helth Gaukås, Silje Marie Dale, Trygve Magnus Ræder, Andreas Toresen, Randi Holmestad, Julia Glaum, Mari-Ann Einarsrud, Tor Grande
Format:	Article
Language:	English
Published:	MDPI AG 2019-06-01
Series:	Materials
Subjects:	KNN thin film aqueous chemical solution deposition
Online Access:	https://www.mdpi.com/1996-1944/12/13/2042

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spelling	doaj-afc4af5d6dc34edb9fda0a6635243f542020-11-25T00:22:50ZengMDPI AGMaterials1996-19442019-06-011213204210.3390/ma12132042ma12132042Controlling Phase Purity and Texture of K<sub>0.5</sub>Na<sub>0.5</sub>NbO<sub>3</sub> Thin Films by Aqueous Chemical Solution DepositionNikolai Helth Gaukås0Silje Marie Dale1Trygve Magnus Ræder2Andreas Toresen3Randi Holmestad4Julia Glaum5Mari-Ann Einarsrud6Tor Grande7Department of Materials Science and Engineering, NTNU Norwegian University of Science and Technology, NO-7491 Trondheim, NorwayDepartment of Materials Science and Engineering, NTNU Norwegian University of Science and Technology, NO-7491 Trondheim, NorwayDepartment of Materials Science and Engineering, NTNU Norwegian University of Science and Technology, NO-7491 Trondheim, NorwayDepartment of Physics, NTNU Norwegian University of Science and Technology, NO-7491 Trondheim, NorwayDepartment of Physics, NTNU Norwegian University of Science and Technology, NO-7491 Trondheim, NorwayDepartment of Materials Science and Engineering, NTNU Norwegian University of Science and Technology, NO-7491 Trondheim, NorwayDepartment of Materials Science and Engineering, NTNU Norwegian University of Science and Technology, NO-7491 Trondheim, NorwayDepartment of Materials Science and Engineering, NTNU Norwegian University of Science and Technology, NO-7491 Trondheim, NorwayAqueous chemical solution deposition (CSD) of lead-free ferroelectric K<sub>0.5</sub>Na<sub>0.5</sub>NbO<sub>3</sub> (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.https://www.mdpi.com/1996-1944/12/13/2042KNNthin filmaqueous chemical solution deposition
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Nikolai Helth Gaukås Silje Marie Dale Trygve Magnus Ræder Andreas Toresen Randi Holmestad Julia Glaum Mari-Ann Einarsrud Tor Grande
spellingShingle	Nikolai Helth Gaukås Silje Marie Dale Trygve Magnus Ræder Andreas Toresen Randi Holmestad Julia Glaum Mari-Ann Einarsrud Tor Grande Controlling Phase Purity and Texture of K<sub>0.5</sub>Na<sub>0.5</sub>NbO<sub>3</sub> Thin Films by Aqueous Chemical Solution Deposition Materials KNN thin film aqueous chemical solution deposition
author_facet	Nikolai Helth Gaukås Silje Marie Dale Trygve Magnus Ræder Andreas Toresen Randi Holmestad Julia Glaum Mari-Ann Einarsrud Tor Grande
author_sort	Nikolai Helth Gaukås
title	Controlling Phase Purity and Texture of K<sub>0.5</sub>Na<sub>0.5</sub>NbO<sub>3</sub> Thin Films by Aqueous Chemical Solution Deposition
title_short	Controlling Phase Purity and Texture of K<sub>0.5</sub>Na<sub>0.5</sub>NbO<sub>3</sub> Thin Films by Aqueous Chemical Solution Deposition
title_full	Controlling Phase Purity and Texture of K<sub>0.5</sub>Na<sub>0.5</sub>NbO<sub>3</sub> Thin Films by Aqueous Chemical Solution Deposition
title_fullStr	Controlling Phase Purity and Texture of K<sub>0.5</sub>Na<sub>0.5</sub>NbO<sub>3</sub> Thin Films by Aqueous Chemical Solution Deposition
title_full_unstemmed	Controlling Phase Purity and Texture of K<sub>0.5</sub>Na<sub>0.5</sub>NbO<sub>3</sub> Thin Films by Aqueous Chemical Solution Deposition
title_sort	controlling phase purity and texture of k<sub>0.5</sub>na<sub>0.5</sub>nbo<sub>3</sub> thin films by aqueous chemical solution deposition
publisher	MDPI AG
series	Materials
issn	1996-1944
publishDate	2019-06-01
description	Aqueous chemical solution deposition (CSD) of lead-free ferroelectric K<sub>0.5</sub>Na<sub>0.5</sub>NbO<sub>3</sub> (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.
topic	KNN thin film aqueous chemical solution deposition
url	https://www.mdpi.com/1996-1944/12/13/2042
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Controlling Phase Purity and Texture of K<sub>0.5</sub>Na<sub>0.5</sub>NbO<sub>3</sub> Thin Films by Aqueous Chemical Solution Deposition

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