Strain relaxation of monolayer WS2 on plastic substrate

Qianhui Zhang, Zhenyue Chang, Guanzhong Xu, Ziyu Wang, Yupeng Zhang, Zai-Quan Xu, Shujian Chen, Qiaoliang Bao, Jefferson Zhe Liu, Yui Wing Mai, Wenhui Duan, Michael S. Fuhrer, Changxi Zheng

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Strain-dependent electrical and optical properties of atomically thin transition metal dichalcogenides may be useful in sensing applications. However, the question of how strain relaxes in atomically thin materials remains not well understood. Herein, the strain relaxation of triangular WS2 deposited on polydimethylsiloxane substrate is investigated. The photoluminescence of trions (X) and excitons (X0) undergoes linear redshifts of ≈20 meV when the substrate tensile strain increases from 0 to 0.16. However, when the substrate strain further increases from 0.16 to 0.32, the redshifts cease due to strain relaxation in WS2. The strain relaxation occurs through formation of wrinkles in the WS2 crystal. The pattern of wrinkles is found to be dependent on the relative angle between an edge of the triangular WS2 crystal and tensile strain direction. Finite element simulations of the strain distribution inside the WS2 crystals explain the experimental observations.

Original languageEnglish
Pages (from-to)8707-8714
Number of pages8
JournalAdvanced Functional Materials
Volume26
Issue number47
DOIs
Publication statusPublished - 20 Dec 2016

Keywords

  • Excitons
  • Finite element simulation
  • Strain relaxation
  • Transition metal dichalcogenides
  • Trions

Cite this

Zhang, Qianhui ; Chang, Zhenyue ; Xu, Guanzhong ; Wang, Ziyu ; Zhang, Yupeng ; Xu, Zai-Quan ; Chen, Shujian ; Bao, Qiaoliang ; Liu, Jefferson Zhe ; Mai, Yui Wing ; Duan, Wenhui ; Fuhrer, Michael S. ; Zheng, Changxi. / Strain relaxation of monolayer WS2 on plastic substrate. In: Advanced Functional Materials. 2016 ; Vol. 26, No. 47. pp. 8707-8714.
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title = "Strain relaxation of monolayer WS2 on plastic substrate",
abstract = "Strain-dependent electrical and optical properties of atomically thin transition metal dichalcogenides may be useful in sensing applications. However, the question of how strain relaxes in atomically thin materials remains not well understood. Herein, the strain relaxation of triangular WS2 deposited on polydimethylsiloxane substrate is investigated. The photoluminescence of trions (X–) and excitons (X0) undergoes linear redshifts of ≈20 meV when the substrate tensile strain increases from 0 to 0.16. However, when the substrate strain further increases from 0.16 to 0.32, the redshifts cease due to strain relaxation in WS2. The strain relaxation occurs through formation of wrinkles in the WS2 crystal. The pattern of wrinkles is found to be dependent on the relative angle between an edge of the triangular WS2 crystal and tensile strain direction. Finite element simulations of the strain distribution inside the WS2 crystals explain the experimental observations.",
keywords = "Excitons, Finite element simulation, Strain relaxation, Transition metal dichalcogenides, Trions",
author = "Qianhui Zhang and Zhenyue Chang and Guanzhong Xu and Ziyu Wang and Yupeng Zhang and Zai-Quan Xu and Shujian Chen and Qiaoliang Bao and Liu, {Jefferson Zhe} and Mai, {Yui Wing} and Wenhui Duan and Fuhrer, {Michael S.} and Changxi Zheng",
year = "2016",
month = "12",
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doi = "10.1002/adfm.201603064",
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Zhang, Q, Chang, Z, Xu, G, Wang, Z, Zhang, Y, Xu, Z-Q, Chen, S, Bao, Q, Liu, JZ, Mai, YW, Duan, W, Fuhrer, MS & Zheng, C 2016, 'Strain relaxation of monolayer WS2 on plastic substrate' Advanced Functional Materials, vol. 26, no. 47, pp. 8707-8714. https://doi.org/10.1002/adfm.201603064

Strain relaxation of monolayer WS2 on plastic substrate. / Zhang, Qianhui; Chang, Zhenyue; Xu, Guanzhong; Wang, Ziyu; Zhang, Yupeng; Xu, Zai-Quan; Chen, Shujian; Bao, Qiaoliang; Liu, Jefferson Zhe; Mai, Yui Wing; Duan, Wenhui; Fuhrer, Michael S.; Zheng, Changxi.

In: Advanced Functional Materials, Vol. 26, No. 47, 20.12.2016, p. 8707-8714.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Zhang, Qianhui

AU - Chang, Zhenyue

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AU - Wang, Ziyu

AU - Zhang, Yupeng

AU - Xu, Zai-Quan

AU - Chen, Shujian

AU - Bao, Qiaoliang

AU - Liu, Jefferson Zhe

AU - Mai, Yui Wing

AU - Duan, Wenhui

AU - Fuhrer, Michael S.

AU - Zheng, Changxi

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AB - Strain-dependent electrical and optical properties of atomically thin transition metal dichalcogenides may be useful in sensing applications. However, the question of how strain relaxes in atomically thin materials remains not well understood. Herein, the strain relaxation of triangular WS2 deposited on polydimethylsiloxane substrate is investigated. The photoluminescence of trions (X–) and excitons (X0) undergoes linear redshifts of ≈20 meV when the substrate tensile strain increases from 0 to 0.16. However, when the substrate strain further increases from 0.16 to 0.32, the redshifts cease due to strain relaxation in WS2. The strain relaxation occurs through formation of wrinkles in the WS2 crystal. The pattern of wrinkles is found to be dependent on the relative angle between an edge of the triangular WS2 crystal and tensile strain direction. Finite element simulations of the strain distribution inside the WS2 crystals explain the experimental observations.

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