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Title: Bright Monolayer Tungsten Disulfide via Exciton and Trion Chemical Modulations
Authors: Tao, Ye
Yu, Xuechao
Li, Jiewei
Liang, Houkun
Zhang, Ying
Huang, Wei
Wang, Qi Jie
Keywords: Transition Metal Dichalcogenides
Chemical Modulation
Issue Date: 2018
Source: Tao, Y., Yu, X., Li, J., Liang, H., Zhang, Y., Huang, W., et al. (2018). Bright Monolayer Tungsten Disulfide via Exciton and Trion Chemical Modulations. Nanoscale, 10, 6294-6299.
Series/Report no.: Nanoscale
Abstract: Atomically thin transition metal dichalcogenides (TMDCs) with exceptional electrical and optical properties have drawn tremendous attention for novel optoelectronic applications such as photodetectors, transistors and light emitters, etc. However, the electron bound trions formed through the combination of neutral exciton and electron significantly decrease the photoluminescence (PL) efficiency of TMDCs. In this study, we report a simple yet efficient chemical doping strategy to modulate the optical properties of monolayer tungsten disulfide (WS2). As a demonstrative example, the chemical doped monolayer WS2 exhibits remarkably PL enhancement, which is about one order of magnitude higher than pristine WS2. This outstanding PL enhancement is attributed to the fact that the excess electron which promotes the formation of electron bound trions is effectively decreased through charge transfer from WS2 to chemical dopant. Furthermore, an improved degree of circular polarization from ~9.0% to ~41.5% is also observed in the chemical doped monolayer WS2. Our work illustrates a feasible strategy to manipulate optical properties of TMDCs via exciton modulation, making TMDCs promising candidates for versatile semiconductor-based photonic devices.
ISSN: 2040-3364
DOI: 10.1039/C7NR09442F
Rights: © 2018 The Author(s) (published by Royal Society of Chemistry). This is the author created version of a work that has been peer reviewed and accepted for publication by Nanoscale, Royal Society of Chemistry. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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