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나노 구조 물리 연구단
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Probing defect dynamics in monolayer MoS2 via noise nanospectroscopy

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Title
Probing defect dynamics in monolayer MoS2 via noise nanospectroscopy
Author(s)
Seung Hyun Song; Min-Kyu Joo; Michael Neumann; Hyun Kim; Young Hee Lee
Publication Date
2017-12
Journal
NATURE COMMUNICATIONS, v.8, no., pp.2121 -
Publisher
NATURE PUBLISHING GROUP
Abstract
Monolayer molybdenum disulfide (MoS2) has received intense interest as a strong candidate for next-generation electronics. However, the observed electrical properties of monolayer MoS2 exhibit several anomalies: samples universally exhibit unexpectedly low mobilities, ntype characteristics, and large contact resistances regardless of contact metal work function. These anomalies have been attributed to the presence of defects, but the mechanism behind this link has been elusive. Here we report the ionization dynamics of sulfur monovacancy defects in monolayer MoS2 probed via noise nanospectroscopy, realized by combining noise-current analysis with atomic force microscopy. Due to the nanoscale dimension of the in situ channel defined by the tip size, we probe a few monovacancy defects at a time. Monovacancy defects exhibit switching between three distinct ionization configurations, corresponding to charge states 0, -1, and -2. The most probable charge configurations are 0 and -1, providing a plausible mechanism to explain the observed anomalies of MoS2 monolayers. © The Author(s) 2017
URI
http://pr.ibs.re.kr/handle/8788114/4320
DOI
10.1038/s41467-017-02297-3
ISSN
2041-1723
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
Files in This Item:
Probing defect_Nature Comm_Young Hee Lee.pdfDownload

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