Two-dimensional semiconductor alloys: Monolayer Mo1-xW xSe2

Sefaattin Tongay, Deepa S. Narang, Jun Kang, Wen Fan, Changhyun Ko, Alexander V. Luce, Kevin X. Wang, Joonki Suh, K. D. Patel, V. M. Pathak, Jingbo Li, Junqiao Wu

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152 Scopus citations


Monolayer Mo1-xWxSe2 (x 0, 0.14, 0.75, and 1) alloys were experimentally realized from synthesized crystals. Mo 1-xWxSe2 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 Mo1-xW xSe2 alloys with different gap values, and open a venue for broadening the materials library and applications of two-dimensional semiconductors.

Original languageEnglish (US)
Article number012101
JournalApplied Physics Letters
Issue number1
StatePublished - Jan 6 2014
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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