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Tunable Photoluminescence in WS 2 /WO 3 Monolayer/Nanoparticles Hybrid Structure
Author(s) -
Tao Lei,
Zhao Shudong,
Miao Peng,
Yu Jianxin,
Wang Xianjie,
Wang Yi,
Liu Zhiguo,
Li Bingsheng,
Wang Yang,
Sui Yu
Publication year - 2018
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201700371
Subject(s) - monolayer , photoluminescence , exciton , trion , passivation , materials science , nanoparticle , nanotechnology , semiconductor , band gap , optoelectronics , condensed matter physics , physics , layer (electronics)
Photoluminescence (PL) of WS 2 monolayer has attracted attention triggered by potential optoelectronic and photoelectric applications due to the largest direct band gap in WS 2 monolayer among transition metal dichalcogenides. The PL of WS 2 monolayer is dominated by charged excitons (trions) and bound excitons, which suppress the luminescence of free excitons. Herein, we report a one‐step growth of a nanosheet/nanoparticles hybrid structure to reduce the emission of bound excitons and trions in WS 2 monolayer by surface passivation with WO 3 nanoparticles. Peak positions of the PL spectra in WS 2 monolayers depend on the density of WO 3 nanoparticles on their surface. With increasing density of WO 3 nanoparticles, the PL of WS 2 monolayers experiences the transition from bound excitons and charged excitons (trions) to neutral excitons. These results suggest that the engineering of PL of WS 2 monolayers may be realized by surface passivation using nanoparticles of wide band gap semiconductors.