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所属单位：航空学院

发表刊物：Nano Energy

摘要：Semiconducting Janus transition metal dichalcogenides (TMDs) are attractive for application in nanoscale electricity harvesting devices as their strong out-of-plane piezoelectricity. Here our extensive first-principles calculations reveal that in-plane interlayer sliding of Janus MXY (M = Mo or W, X/Y = S, Se, or Te, and X ≠ Y) bilayers would lead to significant enhancement of vertical piezoelectricity. The tribo-piezoelectric transduction mechanism is elucidated by tribological energy conversion of Janus TMD bilayers overcoming interlayer sliding resistance to reach the A-A stacking states that have the strongest out-of-plane piezoelectricity. Reducing interlayer distances of Janus TMD bilayers increases sliding energy barriers, and accordingly improves vertical charge polarization and inductive voltage generated between the top and bottom surfaces of Janus TMD bilayers. Based on the presented tribo-piezoelectricity, a compression-sliding design strategy is proposed for Janus TMD bilayers to create novel nanogenerators. © 2018 Elsevier Ltd

ISSN号：2211-2855

是否译文：否

发表时间：2019-02-01

合写作者：Cai, Haifang,Gao, Huajian,郭万林

通讯作者：郭宇锋