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Atomic-level insights through spectroscopic and transport measurements into the large-area synthesis of MoS2 thin films

Published online by Cambridge University Press:  15 August 2018

Hassana Samassekou
Affiliation:
Department of Physics, Southern Illinois University, Carbondale, IL 62901, USA
Asma Alkabsh
Affiliation:
Department of Physics, Southern Illinois University, Carbondale, IL 62901, USA
Kenneth Stiwinter
Affiliation:
Department of Physics, Southern Illinois University, Carbondale, IL 62901, USA
Avinash Khatri
Affiliation:
Department of Physics, Southern Illinois University, Carbondale, IL 62901, USA
Dipanjan Mazumdar*
Affiliation:
Department of Physics, Southern Illinois University, Carbondale, IL 62901, USA
*
Address all correspondence to Dipanjan Mazumdar at [email protected]
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Abstract

Several structure–property relationships are reported in large-area MoS2 thin films to understand the effect of sulfur vacancies along with complementary first-principles calculations. X-ray diffraction and reflectivity measurements demonstrated that sputtered MoS2 followed by a high-temperature sulfurization produced sharp film–substrate interface along with high crystalline order. Spectroscopic and transport measurements showed that removal of sulfur vacancies promoted A–B excitons, strong in-plane Raman modes, a sharp increase in dc resistivity, and strong photo-conducting behavior. We have clearly demonstrated that a hybrid method using magnetron sputtering can provide high-quality few-layer transition metal dichalcogenide films.

Type
Research Letters
Copyright
Copyright © Materials Research Society 2018 

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