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Title: Telluriding monolayer MoS2and WS2 via alkali metal scooter
Authors: Yun, SJ
Han, GH
Kim, H
Duong, DL
Shin, BG
Zhao, J 
Vu, QA
Lee, J
Lee, SM
Lee, YH
Issue Date: 2017
Publisher: Nature Publishing Group
Source: Nature communications, 2017, v. 8, no. 1, 2163 How to cite?
Journal: Nature communications 
Abstract: The conversion of chalcogen atoms to other types in transition metal dichalcogenides has significant advantages for tuning bandgaps and constructing in-plane heterojunctions; however, difficulty arises from the conversion of sulfur or selenium to tellurium atoms owing to the low decomposition temperature of tellurides. Here, we propose the use of sodium for converting monolayer molybdenum disulfide (MoS2) to molybdenum ditelluride (MoTe2) under Te-rich vapors. Sodium easily anchors tellurium and reduces the exchange barrier energy by scooting the tellurium to replace sulfur. The conversion was initiated at the edges and grain boundaries of MoS2, followed by complete conversion in the entire region. By controlling sodium concentration and reaction temperature of monolayer MoS2, we tailored various phases such as semiconducting 2H-MoTe2, metallic 1T'-MoTe2, and 2H-MoS2-xTexalloys. This concept was further extended to WS2. A high valley polarization of ~37% in circularly polarized photoluminescence was obtained in the monolayer WS2-xTexalloy at room temperature.
EISSN: 2041-1723
DOI: 10.1038/s41467-017-02238-0
Rights: © The Author(s) 2017. Published by Nature Publishing Group. This article is licensed under a Creative Commons Attribution 4.0 International License. (
The following article: Yun, S. J., Han, G. H., Kim, H., Duong, D. L., Shin, B. G., Zhao, J., ... & Lee, Y. H. (2017). Telluriding monolayer MoS 2 and WS 2 via alkali metal scooter. Nature communications, 8(1), 2163 is available at
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