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나노 구조 물리 연구단
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Biexciton Emission from Edges and Grain Boundaries of Triangular WS2 Monolayers Highly Cited Paper

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Title
Biexciton Emission from Edges and Grain Boundaries of Triangular WS2 Monolayers
Author(s)
Min Su Kim; Seok Joon Yun; Yongjun Lee; Changwon Seo; Gang Hee Han; Kim, KK; Young Hee Lee; Jeongyong Kim
Publication Date
2016-02
Journal
ACS NANO, v.10, no.2, pp.2399 - 2405
Publisher
AMER CHEMICAL SOC
Abstract
Monolayer tungsten disulfides (WS2) constitute a high quantum yield two-dimensional (2D) system, and can be synthesized on a large area using chemical vapor deposition (CVD), suggesting promising nanophotonics applications. However, spatially nonuniform photoluminescence (PL) intensities and peak wavelengths observed in single WS2 grains have puzzled researchers, with the origins of variation in relative contributions of excitons, trions, and biexcitons to the PL emission not well understood. Here, we present nanoscale PL and Raman spectroscopy images of triangular CVD-grown WS2 monolayers of different sizes, with these images obtained under different temperatures and values of excitation power. Intense PL emissions were observed around the edges of individual WS2 grains and the grain boundaries between partly merged WS2 grains. The predominant origin of the main PL emission from these regions changed from neutral excitons to trions and biexcitons with increasing laser excitation power, with biexcitons completely dominating the PL emission for the high-power condition. The intense PL emission and the preferential formation of biexcitons in the edges and grain boundaries of monolayer WS2 were attributed to larger population of charge carriers caused by the excessive incorporation of growth promoters during the CVD, suggesting positive roles of excessive carriers in the PL efficiency of TMD monolayers. Our comprehensive nanoscale spectroscopic investigation sheds light on the dynamic competition between exciton complexes occurring in monolayer WS,, suggesting a rich variety of ways to engineer new nanophotonic functions using 2D transition metal dichalcogenide monolayers. © 2016 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/2904
ISSN
1936-0851
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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