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Monolayer Mo WSe (x = 0, 0.14, 0.75, and 1) alloys were experimentally realized from synthesized crystals. Mo WSe monolayers are direct bandgap semiconductors displaying high luminescence and are stable in ambient. The bandgap values can be tuned by varying the W composition. Interestingly, the bandgap values do not scale linearly with composition. Such non-linearity is attributed to localization of conduction band minimum states around Mo d orbitals, whereas the valence band maximum states are uniformly distributed among W and Mo d orbitals. Results introduce monolayer Mo WSe alloys with different gap values, and open a venue for broadening the materials library and applications of two-dimensional semiconductors.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Two-dimensional semiconductor alloys: Monolayer Mo1−xWxSe2