Identifying and overcoming the interface originating c-axis instability in highly Sc enhanced AlN for piezoelectric micro-electromechanical systems

Enhancing the piezoelectric activity of AlN by partially substituting Al with Sc to form Al1–xScxN is a promising approach to improve the performance of piezoelectric micro-electromechanical systems. Here, we present evidence of an instability in the morphology of Al1–xScxN, which originates at, or...

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Veröffentlicht in:Journal of applied physics 2017-07, Vol.122 (3)
Hauptverfasser: Fichtner, Simon, Wolff, Niklas, Krishnamurthy, Gnanavel, Petraru, Adrian, Bohse, Sascha, Lofink, Fabian, Chemnitz, Steffen, Kohlstedt, Hermann, Kienle, Lorenz, Wagner, Bernhard
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container_issue 3
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container_title Journal of applied physics
container_volume 122
creator Fichtner, Simon
Wolff, Niklas
Krishnamurthy, Gnanavel
Petraru, Adrian
Bohse, Sascha
Lofink, Fabian
Chemnitz, Steffen
Kohlstedt, Hermann
Kienle, Lorenz
Wagner, Bernhard
description Enhancing the piezoelectric activity of AlN by partially substituting Al with Sc to form Al1–xScxN is a promising approach to improve the performance of piezoelectric micro-electromechanical systems. Here, we present evidence of an instability in the morphology of Al1–xScxN, which originates at, or close to, the substrate/Al1–xScxN interface and becomes more pronounced as the Sc content is increased. Based on Transmission electron microscopy, piezoresponse force microscopy, X-ray diffraction, and SEM analysis, it is identified to be the incipient formation of (100) oriented grains. Approaches to successfully reestablish exclusive c-axis orientation up to x = 0.43 are revealed, with electrode pre-treatment and cathode-substrate distance found to exert significant influence. This allows us to present first measurements of the transversal thin film piezoelectric coefficient e31,f and dielectric loss tangent tan   δ beyond x = 0.3.
doi_str_mv 10.1063/1.4993908
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source AIP Journals Complete; Alma/SFX Local Collection
subjects Aluminum nitride
Applied physics
Dielectric loss
Interface stability
Microelectromechanical systems
Microscopy
Morphology
Performance enhancement
Piezoelectricity
Pretreatment
Scandium
Substrates
Thin films
Transmission electron microscopy
X-ray diffraction
title Identifying and overcoming the interface originating c-axis instability in highly Sc enhanced AlN for piezoelectric micro-electromechanical systems
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