Tunable Photoluminescence in WS2/WO3 Monolayer/Nanoparticles Hybrid Structure. Issue 3 (12th January 2018)

• Record Type: Journal Article
• Authors: Tao, Lei; Zhao, Shudong; Miao, Peng; Yu, Jianxin; Wang, Xianjie; Wang, Yi; Liu, Zhiguo; Li, Bingsheng; Wang, Yang; Sui, Yu
• Is Part Of: Physica status solidi. Volume 12:Issue 3(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-01-12
• Subjects: excitons -- photoluminescence -- surface passivation -- transition metal dichalcogenides -- WS2 monolayer; Solid state physics -- Periodicals; 530.4105
• DOI: 10.1002/pssr.201700371
• Languages: English
• ISSNs: 1862-6254

Abstract

Abstract : Photoluminescence (PL) of WS2 monolayer has attracted attention triggered by potential optoelectronic and photoelectric applications due to the largest direct band gap in WS2 monolayer among transition metal dichalcogenides. The PL of WS2 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 WS2 monolayer by surface passivation with WO3 nanoparticles. Peak positions of the PL spectra in WS2 monolayers depend on the density of WO3 nanoparticles on their surface. With increasing density of WO3 nanoparticles, the PL of WS2 monolayers experiences the transition from bound excitons and charged excitons (trions) to neutral excitons. These results suggest that the engineering of PL of WS2 monolayers may be realized by surface passivation using nanoparticles of wide band gap semiconductors. Abstract : By utilizing the active vacancy defects in the WS2 monolayer as step for WO3 deposition, WO3 /WS2 hybrid structures are prepared by a one‐pot chemical vapor deposition growth. The photoluminescence of the WS2 monolayer can be tuned by surface passivation with WO3 nanoparticles.