Telluriding monolayer MoS2 and WS2 via alkali metal scooter

Seok Joon Yun, Gang Hee Han, Hyun Kim, Dinh Loc Duong, Bong Gyu Shin, Jiong Zhao, Quoc An Vu, Jubok Lee, Seung Mi Lee and Young Hee Lee ()
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Seok Joon Yun: Institute for Basic Science (IBS)
Gang Hee Han: Institute for Basic Science (IBS)
Hyun Kim: Institute for Basic Science (IBS)
Dinh Loc Duong: Institute for Basic Science (IBS)
Bong Gyu Shin: Institute for Basic Science (IBS)
Jiong Zhao: The Hong Kong Polytechnic University
Quoc An Vu: Institute for Basic Science (IBS)
Jubok Lee: Institute for Basic Science (IBS)
Seung Mi Lee: Korea Research Institute of Standards and Science
Young Hee Lee: Institute for Basic Science (IBS)

Nature Communications, 2017, vol. 8, issue 1, 1-10

Abstract: 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−x Te x alloys. This concept was further extended to WS2. A high valley polarization of ~37% in circularly polarized photoluminescence was obtained in the monolayer WS2−x Te x alloy at room temperature.

Date: 2017
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DOI: 10.1038/s41467-017-02238-0

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