Ambient effects on electrical characteristics of CVD-grown monolayer MoS2 field-effect transistors

Abstract Monolayer materials are sensitive to their environment because all of the atoms are at their surface. We investigate how exposure to the environment affects the electrical properties of CVD-grown monolayer MoS2 by monitoring electrical parameters of MoS2 field-effect transistors as their en...

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Autores principales:	Jae-Hyuk Ahn, William M. Parkin, Carl H. Naylor, A. T. Charlie Johnson, Marija Drndić
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/dc9417244e4b4a33a3a4299611d3c2c9
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spelling	oai:doaj.org-article:dc9417244e4b4a33a3a4299611d3c2c92021-12-02T11:41:10ZAmbient effects on electrical characteristics of CVD-grown monolayer MoS2 field-effect transistors10.1038/s41598-017-04350-z2045-2322https://doaj.org/article/dc9417244e4b4a33a3a4299611d3c2c92017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-04350-zhttps://doaj.org/toc/2045-2322Abstract Monolayer materials are sensitive to their environment because all of the atoms are at their surface. We investigate how exposure to the environment affects the electrical properties of CVD-grown monolayer MoS2 by monitoring electrical parameters of MoS2 field-effect transistors as their environment is changed from atmosphere to high vacuum. The mobility increases and contact resistance decreases simultaneously as either the pressure is reduced or the sample is annealed in vacuum. We see a previously unobserved, non-monotonic change in threshold voltage with decreasing pressure. This result could be explained by charge transfer on the MoS2 channel and Schottky contact formation due to adsorbates at the interface between the gold contacts and MoS2. Additionally, from our electrical measurements it is plausible to infer that at room temperature and pressure water and oxygen molecules adsorbed on the surface act as interface traps and scattering centers with a density of several 1012 cm−2 eV−1, degrading the electrical properties of monolayer MoS2.Jae-Hyuk AhnWilliam M. ParkinCarl H. NaylorA. T. Charlie JohnsonMarija DrndićNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jae-Hyuk Ahn William M. Parkin Carl H. Naylor A. T. Charlie Johnson Marija Drndić Ambient effects on electrical characteristics of CVD-grown monolayer MoS2 field-effect transistors
description	Abstract Monolayer materials are sensitive to their environment because all of the atoms are at their surface. We investigate how exposure to the environment affects the electrical properties of CVD-grown monolayer MoS2 by monitoring electrical parameters of MoS2 field-effect transistors as their environment is changed from atmosphere to high vacuum. The mobility increases and contact resistance decreases simultaneously as either the pressure is reduced or the sample is annealed in vacuum. We see a previously unobserved, non-monotonic change in threshold voltage with decreasing pressure. This result could be explained by charge transfer on the MoS2 channel and Schottky contact formation due to adsorbates at the interface between the gold contacts and MoS2. Additionally, from our electrical measurements it is plausible to infer that at room temperature and pressure water and oxygen molecules adsorbed on the surface act as interface traps and scattering centers with a density of several 1012 cm−2 eV−1, degrading the electrical properties of monolayer MoS2.
format	article
author	Jae-Hyuk Ahn William M. Parkin Carl H. Naylor A. T. Charlie Johnson Marija Drndić
author_facet	Jae-Hyuk Ahn William M. Parkin Carl H. Naylor A. T. Charlie Johnson Marija Drndić
author_sort	Jae-Hyuk Ahn
title	Ambient effects on electrical characteristics of CVD-grown monolayer MoS2 field-effect transistors
title_short	Ambient effects on electrical characteristics of CVD-grown monolayer MoS2 field-effect transistors
title_full	Ambient effects on electrical characteristics of CVD-grown monolayer MoS2 field-effect transistors
title_fullStr	Ambient effects on electrical characteristics of CVD-grown monolayer MoS2 field-effect transistors
title_full_unstemmed	Ambient effects on electrical characteristics of CVD-grown monolayer MoS2 field-effect transistors
title_sort	ambient effects on electrical characteristics of cvd-grown monolayer mos2 field-effect transistors
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/dc9417244e4b4a33a3a4299611d3c2c9
work_keys_str_mv	AT jaehyukahn ambienteffectsonelectricalcharacteristicsofcvdgrownmonolayermos2fieldeffecttransistors AT williammparkin ambienteffectsonelectricalcharacteristicsofcvdgrownmonolayermos2fieldeffecttransistors AT carlhnaylor ambienteffectsonelectricalcharacteristicsofcvdgrownmonolayermos2fieldeffecttransistors AT atcharliejohnson ambienteffectsonelectricalcharacteristicsofcvdgrownmonolayermos2fieldeffecttransistors AT marijadrndic ambienteffectsonelectricalcharacteristicsofcvdgrownmonolayermos2fieldeffecttransistors
_version_	1718395489731215360

Ambient effects on electrical characteristics of CVD-grown monolayer MoS2 field-effect transistors

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