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Title: Control of radiative exciton recombination by charge transfer induced surface dipoles in MoS2 and WS2 monolayers
Authors: Hu, Peng
Ye, Jun
He, Xuexia
Du, Kezhao
Zhang, Keke
Wang, Xingzhi
Xiong, Qihua
Liu, Zheng
Jiang, Hui
Kloc, Christian
Keywords: Monolayer
Radiative Exciton Recombination
Issue Date: 2016
Source: Hu, P., Ye, J., He, X., Du, K., Zhang, K., Wang, X., . . . Kloc, C. (2016). Control of radiative exciton recombination by charge transfer induced surface dipoles in MoS2 and WS2 monolayers. Scientific Reports, 6, 24105-. doi:10.1038/srep24105
Series/Report no.: Scientific Reports
Abstract: Due to the two dimensional confinement of electrons in a monolayer of 2D materials, the properties of monolayer can be controlled by electrical field formed on the monolayer surface. F4TCNQ was evaporated on MoS2 and WS2 monolayer forming dipoles between strong acceptor, F4TCNQ, and monolayers of MoS2 or WS2. The strong acceptor attracts electrons (charge transfer) and decreases the number of the ionized excitons. Free excitons undergo radiative recombination in both MoS2 and WS2. Moreover, the photoluminescence enhancement is stronger in WS2 where the exciton-phonon coupling is weaker. The theoretical model indicates that the surface dipole controls the radiative exciton recombination and enhances photoluminescence radiation. Deposition of F4TCNQ on the 2D monolayers enables a convenient control of the radiative exciton recombination and leads to the applications of these materials in lasers or LEDs.
DOI: 10.1038/srep24105
Rights: © 2016 The Authors (Nature Publishing Group). This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit
Fulltext Permission: open
Fulltext Availability: With Fulltext
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