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Alloying in monolayers enables bandgap tuning in twodimensions. On page 2648, L. Xie, J. Zhang, and co‐workers demonstrate that by direct evaporation of two end materials (MoS2 and MoSe2) and deposition at low temperatures, large‐area 2D MoS2(1−x)Se2x monolayers are obtained. By changing the S/Se composition, the bandgap of MoS2(1−x)Se2x monolayers can be continuously tuned.
Semiconducting MoS2(1‐x)Se2x monolayers where x = 0–0.40 are successfully grown over large areas. A random arrangement of the S and Se atoms and a tunable bandgap photoluminescence are observed. Atomically thin, 2D semiconductor alloys with tunable bandgaps have potential applications in nano‐ and opto‐electronics. Field‐effect transistors fabricated with the monolayers exhibit high on/off ratios...
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