Journal
NATURE COMMUNICATIONS
Volume 8, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-017-02238-0
Keywords
-
Categories
Funding
- Institute for Basic Science of Korea [IBS-R011-D1]
- Human Resources Development Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant - Korean Government Ministry of Trade, Industry, and Energy [20124010203270]
- Ministry of Science & ICT (MSIT), Republic of Korea [IBS-R011-D1-2017-A00] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Ask authors/readers for more resources
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available