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Gas adsorbates are Coulomb scatterers, rather than neutral ones, in a monolayer MoS2 field effect transistor

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Title
Gas adsorbates are Coulomb scatterers, rather than neutral ones, in a monolayer MoS2 field effect transistor
Author(s)
Hyunjin Ji; Hojoon Yi; Jinbong Seok; Hyun Kim; Young Hee Lee; Seong Chu Lim
Publication Date
2018-06
Journal
NANOSCALE, v.10, no.23, pp.10856 - 10862
Publisher
ROYAL SOC CHEMISTRY
Abstract
Direct current (DC) and low-frequency (LF) noise analyses of a chemical vapor deposition (CVD)-grown monolayer MoS2 field effect transistor (FET) indicate that time-varying carrier perturbations originate from gas adsorbates. The LF noise analysis supports that the natural desorption of physisorbed gas molecules, water and oxygen, largely reduces the interface trap density (N-ST) under vacuum conditions (approximate to 10(-8) Torr) for 2 weeks. After a longer period of 8 months under vacuum, the carrier scattering mechanism alters, in particular for the low carrier density (N-acc) region. A decrease of both N-ST and the scattering parameter (SC) with desorption of surface adsorbates from MoS2, explains the enhanced carrier mobility and the early turn-on of the device. The stabilized carrier behavior is verified with = 0.5 in the formula (SC) N-acc(-), as in Si-MOSFETs. Our results support that the gas adsorbates work as charged impurities, rather than neutral ones © The Royal Society of Chemistry 2018
URI
https://pr.ibs.re.kr/handle/8788114/5566
DOI
10.1039/c8nr03570a
ISSN
2040-3364
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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03 c8nr03570a (Gas adsorbates).pdfDownload

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