Two-dimensional electronic transport and surface electron accumulation in MoS2.

Abstract:

:Because the surface-to-volume ratio of quasi-two-dimensional materials is extremely high, understanding their surface characteristics is crucial for practically controlling their intrinsic properties and fabricating p-type and n-type layered semiconductors. Van der Waals crystals are expected to have an inert surface because of the absence of dangling bonds. However, here we show that the surface of high-quality synthesized molybdenum disulfide (MoS2) is a major n-doping source. The surface electron concentration of MoS2 is nearly four orders of magnitude higher than that of its inner bulk. Substantial thickness-dependent conductivity in MoS2 nanoflakes was observed. The transfer length method suggested the current transport in MoS2 following a two-dimensional behavior rather than the conventional three-dimensional mode. Scanning tunneling microscopy and angle-resolved photoemission spectroscopy measurements confirmed the presence of surface electron accumulation in this layered material. Notably, the in situ-cleaved surface exhibited a nearly intrinsic state without electron accumulation.

journal_name

Nat Commun

journal_title

Nature communications

authors

Siao MD,Shen WC,Chen RS,Chang ZW,Shih MC,Chiu YP,Cheng CM

doi

10.1038/s41467-018-03824-6

subject

Has Abstract

pub_date

2018-04-12 00:00:00

pages

1442

issue

1

issn

2041-1723

pii

10.1038/s41467-018-03824-6

journal_volume

9

pub_type

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