Piezoelectricity of atomically thin WSe2 via laterally excited scanning probe microscopy
文献类型：期刊论文
| 作者 | Huang, Bevin; Xu, Xiaodong; Li, Jiangyu; Esfahani, Ehsan Nasr; Li, Terrance |
| 刊名 | NANO ENERGY
 |
| 出版日期 | 2018 |
| 文献子类 | 期刊论文 |
| 英文摘要 | Lattices of odd-layered two-dimensional (2D) transition metal dichalcogenides (TMDs) such as WSe2 are non-centrosymmetric, and thus could possess linear piezoelectricity that is attractive for applications such as nanoelectromechanical systems (NEMS) and nanogenerators. Measuring the electromechanical coupling of 2D TMDs, however, is rather challenging, since its D-3h point group symmetry makes conventional piezoresponse force microscopy (PFM) inapplicable. Here we develop a lateral excitation scanning probe microscopy (SPM) technique that enables mapping of the piezoelectric response ofatomically thin WSe2 directly on a substrate with high spatial resolution. Planar electrodes are used to excite piezoelectric vibrations while imposing anisotropic in-plane mechanical constraint to the WSe2, resulting in an out-of-plane deformation due to Poisson's effect that can be measured by an SPM probe. Using this technique, we show that WSe2 monolayer and trilayers exhibit strong electromechanical response linear to the applied excitation biases that is distinct from the substrate, while WSe2 bilayers show negligible electromechanical response as expected. The effective piezoelectric coefficient is estimated to be 5.2 pm/V from the measurement, consistent with theoretical predictions. This method can be conveniently applied to a wide range of 2D materials with similar symmetry. |
| URL标识 | 查看原文 |
| 语种 | 英语 |
| 源URL | [http://ir.siat.ac.cn:8080/handle/172644/14402]  |
| 专题 | 深圳先进技术研究院_医工所 |
| 推荐引用方式 GB/T 7714 | Huang, Bevin,Xu, Xiaodong,Li, Jiangyu,et al. Piezoelectricity of atomically thin WSe2 via laterally excited scanning probe microscopy[J]. NANO ENERGY,2018. |
| APA | Huang, Bevin,Xu, Xiaodong,Li, Jiangyu,Esfahani, Ehsan Nasr,&Li, Terrance.(2018).Piezoelectricity of atomically thin WSe2 via laterally excited scanning probe microscopy.NANO ENERGY. |
| MLA | Huang, Bevin,et al."Piezoelectricity of atomically thin WSe2 via laterally excited scanning probe microscopy".NANO ENERGY (2018). |
入库方式： OAI收割
来源：深圳先进技术研究院
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