Transition metal dichalcogenide graded alloy monolayers by chemical vapor deposition and comparison to 2D Ising model

In this work, a chemical vapor deposition (CVD) method was developed for the synthesis of transition metal dichalcogenide alloy monolayers, with a composition gradient in the radial direction. The composition gradient was achieved by controlling the substrate cooling rate during the CVD growth. The...

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Published inThe Journal of chemical physics Vol. 156; no. 13; p. 134704
Main Authors Jalouli, Alireza, Kilinc, Muhammed, Marga, Austin, Bian, Mengying, Thomay, Tim, Petrou, Athos, Zeng, Hao
Format Journal Article
LanguageEnglish
Published United States 07.04.2022
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Summary:In this work, a chemical vapor deposition (CVD) method was developed for the synthesis of transition metal dichalcogenide alloy monolayers, with a composition gradient in the radial direction. The composition gradient was achieved by controlling the substrate cooling rate during the CVD growth. The two types of alloys, namely, WS Se and MoS Se , were found to exhibit an opposite composition gradient. This is attributed to their different cohesive energies. A two-dimensional Ising model is used to explain the growth mechanism, where two ends of the composition were modeled as a magnetically ordered phase and a paramagnetic phase. The composition as a function of substrate temperature is then represented by the thermal magnetization curve.
ISSN:1089-7690
DOI:10.1063/5.0081929