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나노 구조 물리 연구단
나노구조물리 연구단
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Telluriding monolayer MoS2 and WS2 via alkali metal scooter

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Title
Telluriding monolayer MoS2 and WS2 via alkali metal scooter
Author(s)
Seok Joon Yun; Gang Hee Han; Hyun Kim; Dinh Loc Duong; Bong Gyu Shin; Jiong Zhao; Quoc An Vu; Jubok Lee; Seung Mi Lee; Young Hee Lee
Publication Date
2017-12
Journal
NATURE COMMUNICATIONS, v.8, no., pp.2163 -
Publisher
NATURE PUBLISHING GROUP
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-xTex alloys. This concept was further extended to WS2. A high valley polarization of similar to 37% in circularly polarized photoluminescence was obtained in the monolayer WS2-xTex alloy at room temperature. © The Author(s) 2017
URI
http://pr.ibs.re.kr/handle/8788114/4314
DOI
10.1038/s41467-017-02238-0
ISSN
2041-1723
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
Files in This Item:
Telluriding monolayer_Nature Comm._Young Hee Lee.pdfDownload

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