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    Piezoelectric effect in chemical vapour deposition-grown atomic-monolayer triangular molybdenum disulfide piezotronics

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    Type
    Article
    Authors
    Qi, Junjie
    Lan, Yann-Wen
    Stieg, Adam Z. cc
    Chen, Jyun-Hong
    Zhong, Yuan-Liang
    Li, Lain-Jong cc
    Chen, Chii-Dong
    Zhang, Yue
    Wang, Kang L.
    KAUST Department
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2015-06-25
    Online Publication Date
    2015-06-25
    Print Publication Date
    2015-12
    Permanent link to this record
    http://hdl.handle.net/10754/558702
    
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    Abstract
    High-performance piezoelectricity in monolayer semiconducting transition metal dichalcogenides is highly desirable for the development of nanosensors, piezotronics and photo-piezotransistors. Here we report the experimental study of the theoretically predicted piezoelectric effect in triangle monolayer MoS2 devices under isotropic mechanical deformation. The experimental observation indicates that the conductivity of MoS2 devices can be actively modulated by the piezoelectric charge polarization-induced built-in electric field under strain variation. These polarization charges alter the Schottky barrier height on both contacts, resulting in a barrier height increase with increasing compressive strain and decrease with increasing tensile strain. The underlying mechanism of strain-induced in-plane charge polarization is proposed and discussed using energy band diagrams. In addition, a new type of MoS2 strain/force sensor built using a monolayer MoS2 triangle is also demonstrated. Our results provide evidence for strain-gating monolayer MoS2 piezotronics, a promising avenue for achieving augmented functionalities in next-generation electronic and mechanical–electronic nanodevices.
    Citation
    Piezoelectric effect in chemical vapour deposition-grown atomic-monolayer triangular molybdenum disulfide piezotronics 2015, 6:7430 Nature Communications
    Publisher
    Springer Nature
    Journal
    Nature Communications
    DOI
    10.1038/ncomms8430
    PubMed ID
    26109177
    Additional Links
    http://www.nature.com/doifinder/10.1038/ncomms8430
    ae974a485f413a2113503eed53cd6c53
    10.1038/ncomms8430
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program

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