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Open AccessArticle

Nanotip Contacts for Electric Transport and Field Emission Characterization of Ultrathin MoS2 Flakes

1
Department of Physics ‘E.R.Caianello’, University of Salerno, Via Giovanni Paolo II, 132-84084 Fisciano (SA), Italy
2
CNR-SPIN Institute, Via Giovanni Paolo II, 132-84084 Fisciano (SA), Italy
3
Department of Physical and Chemical Science, University of L’Aquila, via Vetoio, Coppito, 67100 L’Aquila, Italy
*
Author to whom correspondence should be addressed.
Nanomaterials 2020, 10(1), 106; https://doi.org/10.3390/nano10010106
Received: 16 December 2019 / Revised: 31 December 2019 / Accepted: 2 January 2020 / Published: 4 January 2020
(This article belongs to the Special Issue 2D Materials and Their Heterostructures and Superlattices)
We report a facile approach based on piezoelectric-driven nanotips inside a scanning electron microscope to contact and electrically characterize ultrathin MoS2 (molybdenum disulfide) flakes on a SiO2/Si (silicon dioxide/silicon) substrate. We apply such a method to analyze the electric transport and field emission properties of chemical vapor deposition-synthesized monolayer MoS2, used as the channel of back-gate field effect transistors. We study the effects of the gate-voltage range and sweeping time on the channel current and on its hysteretic behavior. We observe that the conduction of the MoS2 channel is affected by trap states. Moreover, we report a gate-controlled field emission current from the edge part of the MoS2 flake, evidencing a field enhancement factor of approximately 200 and a turn-on field of approximately   40   V / μ m at a cathode–anode separation distance of 900   nm . View Full-Text
Keywords: molybdenum disulfide; field effect transistor; field emission; contacts; electric transport molybdenum disulfide; field effect transistor; field emission; contacts; electric transport
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MDPI and ACS Style

Iemmo, L.; Urban, F.; Giubileo, F.; Passacantando, M.; Di Bartolomeo, A. Nanotip Contacts for Electric Transport and Field Emission Characterization of Ultrathin MoS2 Flakes. Nanomaterials 2020, 10, 106.

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