Intrinsic Piezoelectricity in Two-Dimensional Materials

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• 作者：Karel-Alexander N. Duerloo ; Mitchell T. Ong ; Evan J. Reed
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2012
• 出版时间：October 4, 2012
• 年：2012
• 卷：3
• 期：19
• 页码：2871-2876
• 全文大小：324K
• 年卷期：v.3,no.19(October 4, 2012)
• ISSN：1948-7185

文摘

We discovered that many of the commonly studied two-dimensional monolayer transition metal dichalcogenide (TMDC) nanoscale materials are piezoelectric, unlike their bulk parent crystals. On the macroscopic scale, piezoelectricity is widely used to achieve robust electromechanical coupling in a rich variety of sensors and actuators. Remarkably, our density-functional theory calculations of the piezoelectric coefficients of monolayer BN, MoS₂, MoSe₂, MoTe₂, WS₂, WSe₂, and WTe₂ reveal that some of these materials exhibit stronger piezoelectric coupling than traditionally employed bulk wurtzite structures. We find that the piezoelectric coefficients span more than 1 order of magnitude, and exhibit monotonic periodic trends. The discovery of this property in many two-dimensional materials enables active sensing, actuating, and new electronic components for nanoscale devices based on the familiar piezoelectric effect.

Keywords:

boron nitride; transition metal dichalcogenides (TMDCs); nanoelectromechanical systems (NEMS); elastic coefficients; piezoelectric coefficients; atomically thin materials; piezotronics