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    Out-of-plane Piezoelectricity and Ferroelectricity in Layered α-In2Se3 Nano-flakes

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    Type
    Article
    Authors
    Zhou, Yu
    Wu, Di
    Zhu, Yihan
    Cho, Yujin
    He, Qing
    Yang, Xiao
    Herrera, Kevin
    Chu, Zhaodong
    Han, Yu cc
    Downer, Mike
    Peng, Hailin
    Lai, Keji
    KAUST Department
    Advanced Membranes and Porous Materials Research Center
    Chemical Science Program
    Nanostructured Functional Materials (NFM) laboratory
    Physical Science and Engineering (PSE) Division
    Date
    2017-08-30
    Online Publication Date
    2017-08-30
    Print Publication Date
    2017-09-13
    Permanent link to this record
    http://hdl.handle.net/10754/625427
    
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    Abstract
    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 Letters
    DOI
    10.1021/acs.nanolett.7b02198
    PubMed ID
    28841328
    Additional Links
    http://pubs.acs.org/doi/abs/10.1021/acs.nanolett.7b02198
    ae974a485f413a2113503eed53cd6c53
    10.1021/acs.nanolett.7b02198
    Scopus Count
    Collections
    Articles; Advanced Membranes and Porous Materials Research Center; Physical Science and Engineering (PSE) Division; Chemical Science Program

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