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Strain Relaxation of Monolayer WS 2 on Plastic Substrate
Author(s) -
Zhang Qianhui,
Chang Zhenyue,
Xu Guanzhong,
Wang Ziyu,
Zhang Yupeng,
Xu ZaiQuan,
Chen Shujian,
Bao Qiaoliang,
Liu Jefferson Zhe,
Mai YuiWing,
Duan Wenhui,
Fuhrer Michael S.,
Zheng Changxi
Publication year - 2016
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201603064
Subject(s) - materials science , strain (injury) , substrate (aquarium) , photoluminescence , relaxation (psychology) , monolayer , redshift , crystal (programming language) , ultimate tensile strength , condensed matter physics , polydimethylsiloxane , composite material , nanotechnology , optoelectronics , medicine , psychology , social psychology , oceanography , physics , quantum mechanics , galaxy , computer science , programming language , geology
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 WS 2 deposited on polydimethylsiloxane substrate is investigated. The photoluminescence of trions ( X – ) and excitons ( X 0 ) 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 WS 2 . The strain relaxation occurs through formation of wrinkles in the WS 2 crystal. The pattern of wrinkles is found to be dependent on the relative angle between an edge of the triangular WS 2 crystal and tensile strain direction. Finite element simulations of the strain distribution inside the WS 2 crystals explain the experimental observations.