Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 9, Issue 4, Pages 1396-1400Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0tc05001f
Keywords
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Funding
- Pearl River Talent Recruitment Program [2019ZT08X639]
- National Natural Science Foundation of China [11904108, 61805045]
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This study identified piezoelectric effect in monolayer WS2 for the first time and significantly improved the dynamic piezoelectric signal by almost one order of magnitude through in-plane uniaxial deformation. The research demonstrates a new strategy for artificially engineering WS2 to achieve larger anisotropy, higher polarization, and superior piezoelectricity, potentially opening up new avenues for applications in 2D-based piezotronics and angle-dependent electronics.
Two-dimensional (2D) piezoelectric materials are mechanically flexible and atomically thin, enabling new emerging applications, such as wearable electronics, human-machine interfacing and strain sensors. The main obstacles for 2D piezoelectric materials are their low in-plane polarization and weak piezoelectric effect. In this study, we found piezoelectric effect in monolayer WS2 for the first time. Further, the in-plane uniaxial deformation was applied along the polarized armchair direction of WS2, giving rise to an enlarged in-plane polarization as evidenced from the higher Raman anisotropy of angle-resolved polarized Raman spectra. As a result, engineered WS2 exhibited a significantly improved dynamic piezoelectric signal by almost one order of magnitude. This study demonstrates a new strategy to artificially engineer monolayer WS2 by applying in-plane deformation for the larger anisotropy, higher polarization and more superior piezoelectricity, which can open up a new way for applications in 2D-based piezotronics and angle-dependent electronics.
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