The Piezoelectricity of AlScN Thin Films under High-Pressure Regime
Physics of the Solid State(2024)
摘要
This study investigated the structural, mechanical, piezoelectric, and electromechanical properties of AlScN thin films using density functional theory (DFT) under varying levels of applied pressure, ranging from 0 to 20 GPa. The primary focus of this research is to explore the feasibility of optimizing AlScN thin films for surface acoustic wave (SAW) applications through pressure-induced modifications. Our findings reveal two significant outcomes. First, we observe a notable increase in the elastic constant C33 as a function of pressure. This increase signifies a substantial enhancement in material stiffness, directly influencing wave propagation and velocity within the thin films. Second, a remarkable 68
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关键词
AlScN thin films,DFT,electromechanical coupling factor,piezoelectric constants,SAW devices
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