The DOI matches its Crossref record; 31 of the 31 references it cites were found in a registry or an index.
Multidirection Piezoelectricity in Mono- and Multilayered Hexagonal α-In2Se3
Abstract
Piezoelectric materials have been widely used for sensors, actuators, electronics, and energy conversion. Two-dimensional (2D) ultrathin semiconductors, such as monolayer h-BN and MoS 2 with their atom-level geometry, are currently emerging as new and attractive members of the piezoelectric family. However, their piezoelectric polarization is commonly limited to the in-plane direction of odd-number ultrathin layers, largely restricting their application in integrated nanoelectromechanical systems. Recently, theoretical calculations have predicted the existence of out-of-plane and in-plane piezoelectricity in monolayer α-In 2 Se 3 . Here, we experimentally report the coexistence of out-of-plane and in-plane piezoelectricity in monolayer to bulk α-In 2 Se 3, attributed to their noncentrosymmetry originating from the hexagonal stacking. Specifically, the corresponding d 33 piezoelectric coefficient of α-In 2 Se 3 increases from 0.34 pm/V (monolayer) to 5.6 pm/V (bulk) without any odd–even effect. In addition, we also demonstrate a type of α-In 2 Se 3 -based flexible piezoelectric nanogenerator as an energy-harvesting cell and electronic skin. The out-of-plane and in-plane piezoelectricity in α-In 2 Se 3 flakes offers an opportunity to enable both directional and nondirectional piezoelectric devices to be applicable for self-powered systems and adaptive and strain-tunable electronics/optoelectronics.
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Self-citation
Metadata
- Authors
- Xue, F., Zhang, J., Hu, W., Hsu, W.-T., Han, A., Leung, S.-F., Huang, J.-K., Wan, Y., Liu, S., Zhang, J., He, J.-H., Chang, W.-H., Wang, Z. L., Zhang, X., & Li, L.-J.
- Venue
- ACS Nano
- Publisher
- American Chemical Society (ACS)
- Published
- 2018-04-25
- Volume
- 12
- Issue
- 5
- Pages
- 4976-4983
- ISSN
- 1936-0851 (ISSN-L)
- 1936-086X
- OpenAlex
- W2799694481
- Cited by
- 319
- References
- 31
- FWCI
- 10.21
- Type
- journal article
- Language
- en
- Open access
- closed
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