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Photoluminescence and Raman Spectra Oscillations Induced by Laser Interference in Annealing‐Created Monolayer WS 2 Bubbles
Author(s) -
Jia Zhiyan,
Dong Jiyu,
Liu Lixuan,
Nie Anmin,
Xiang Jianyong,
Wang Bochong,
Wen Fusheng,
Mu Congpu,
Zhao Zhisheng,
Xu Bo,
Gong Yongji,
Tian Yongjun,
Liu Zhongyuan
Publication year - 2019
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201801373
Subject(s) - materials science , monolayer , photoluminescence , raman spectroscopy , annealing (glass) , chemical vapor deposition , molecular physics , optics , analytical chemistry (journal) , optoelectronics , nanotechnology , composite material , chemistry , physics , chromatography
WS 2 monolayer crystals have been grown in a large scale by chemical vapor deposition on SiO 2 (300 nm)/Si substrates, and via high‐temperature treatment under protection of Ar or N 2 gas flow after growth, huge amount of monolayer WS 2 bubbles have been successfully created in a shape of spherical cap and widely distributed sizes. Optical and fluorescence images reveal obvious interference rings on the monolayer WS 2 bubbles of large sizes. In line scans and mapping images of photoluminescence (PL) and Raman, oscillatory behaviors have been observed not only for peak intensity but also for peak position and width. It is easy to understand that the oscillatory PL and Raman peak intensities originate from constructive and destructive interference on the bubble's surface, while the oscillatory peak positions and widths are induced by the corresponding enhanced and lowered local heating effects owing to constructive and destructive interference. This is further verified by the absence of oscillation in the position and width when a heat sink layer is applied.