Probing defect dynamics in monolayer MoS2 via noise nanospectroscopy

Seung Hyun Song, Min-Kyu Joo, Michael Neumann, Hyun Kim and Young Hee Lee ()
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Seung Hyun Song: Institute for Basic Science (IBS)
Min-Kyu Joo: Institute for Basic Science (IBS)
Michael Neumann: Institute for Basic Science (IBS)
Hyun Kim: Institute for Basic Science (IBS)
Young Hee Lee: Institute for Basic Science (IBS)

Nature Communications, 2017, vol. 8, issue 1, 1-6

Abstract: 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, n-type 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.

Date: 2017
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DOI: 10.1038/s41467-017-02297-3

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