1. Transition metal dichalcogenide graded alloy monolayers by chemical vapor deposition and comparison to 2D Ising model.
- Author
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Jalouli, Alireza, Kilinc, Muhammed, Marga, Austin, Bian, Mengying, Thomay, Tim, Petrou, Athos, and Zeng, Hao
- Subjects
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CHEMICAL vapor deposition , *ISING model , *TRANSITION metals , *TRANSITION metal alloys , *MONOMOLECULAR films , *ALLOYS - Abstract
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, WS2(1−x)Se2x and MoS2(1−x)Se2x, 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. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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