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In article number 1804218, Jordan A. Hachtel, Boris I. Yakobson, Chandra Sekhar Tiwary, Pulickel M. Ajayan, and co‐workers demonstrate that simple annealing of a 2D quaternary (Mo–W–S–Se) alloy results in a thermodynamically stable atomically thin heterostructure of Mo–S–Se and W–S–Se. Transition‐metal‐dichalcogenide alloys (Mo–W–S or Mo–W–Se) are more stable due to negative entropy of mixing.
Composition and phase specific 2D transition metal dichalogenides (2D TMDs) with a controlled electronic and chemical structure are essential for future electronics. While alloying allows bandgap tunability, heterostructure formation creates atomically sharp electronic junctions. Herein, the formation of lateral heterostructures from quaternary 2D TMD alloys, by thermal annealing, is demonstrated...
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