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

Junjie Qi, Yann Wen Lan, Adam Z. Stieg, Jyun Hong Chen, Yuan Liang Zhong, Lain Jong Li, Chii Dong Chen, Yue Zhang, Kang L. Wang

Research output: Contribution to journalArticlepeer-review

161 Citations (Scopus)


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 MoS 2 devices under isotropic mechanical deformation. The experimental observation indicates that the conductivity of MoS 2 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 MoS 2 strain/force sensor built using a monolayer MoS 2 triangle is also demonstrated. Our results provide evidence for strain-gating monolayer MoS 2 piezotronics, a promising avenue for achieving augmented functionalities in next-generation electronic and mechanical-electronic nanodevices.

Original languageEnglish
Article number7430
JournalNature Communications
Publication statusPublished - 2015 Jun 25

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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