Out-of-plane Piezoelectricity and Ferroelectricity in Layered α-In2Se3 Nano-flakes
Type
ArticleAuthors
Zhou, YuWu, Di
Zhu, Yihan
Cho, Yujin
He, Qing
Yang, Xiao
Herrera, Kevin
Chu, Zhaodong
Han, Yu

Downer, Mike
Peng, Hailin
Lai, Keji
KAUST Department
Advanced Membranes and Porous Materials Research CenterChemical Science Program
Nanostructured Functional Materials (NFM) laboratory
Physical Science and Engineering (PSE) Division
Date
2017-08-30Online Publication Date
2017-08-30Print Publication Date
2017-09-13Permanent link to this record
http://hdl.handle.net/10754/625427
Metadata
Show full item recordAbstract
Piezoelectric and ferroelectric properties in the two dimensional (2D) limit are highly desired for nanoelectronic, electromechanical, and optoelectronic applications. Here we report the first experimental evidence of out-of-plane piezoelectricity and ferroelectricity in van der Waals layered α-In2Se3 nano-flakes. The non-centrosymmetric R3m symmetry of the α-In2Se3 samples is confirmed by scanning transmission electron microscopy, second-harmonic generation, and Raman spectroscopy measurements. Domains with opposite polarizations are visualized by piezo-response force microscopy. Single-point poling experiments suggest that the polarization is potentially switchable for α-In2Se3 nano-flakes with thicknesses down to ~ 10 nm. The piezotronic effect is demonstrated in two-terminal devices, where the Schottky barrier can be modulated by the strain-induced piezopotential. Our work on polar α-In2Se3, one of the model 2D piezoelectrics and ferroelectrics with simple crystal structures, shows its great potential in electronic and photonic applications.Citation
Zhou Y, Wu D, Zhu Y, Cho Y, He Q, et al. (2017) Out-of-plane Piezoelectricity and Ferroelectricity in Layered α-In2Se3 Nano-flakes. Nano Letters. Available: http://dx.doi.org/10.1021/acs.nanolett.7b02198.Sponsors
The PFM work is supported by the Welch Foundation Grant F-1814. D.W. and Z.C. also acknowledges the support from NSF EFRI under Award # EFMA-1542747. The SHG work (Y. C. and M. C. D.) is supported by Welch Grant F-1038. The sample synthesis and device fabrication work are supported by the National Basic Research Program of China (No. 2014CB932500) and the National Natural Science Foundation of China (No. 21525310).Publisher
American Chemical Society (ACS)Journal
Nano LettersPubMed ID
28841328Additional Links
http://pubs.acs.org/doi/abs/10.1021/acs.nanolett.7b02198ae974a485f413a2113503eed53cd6c53
10.1021/acs.nanolett.7b02198
Scopus Count
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