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

Research output: Contribution to journalArticle

107 Scopus citations

Abstract

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
Volume104
Issue number1
DOIs
StatePublished - Jan 6 2014
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    Tongay, S., Narang, D. S., Kang, J., Fan, W., Ko, C., Luce, A. V., Wang, K. X., Suh, J., Patel, K. D., Pathak, V. M., Li, J., & Wu, J. (2014). Two-dimensional semiconductor alloys: Monolayer Mo1-xW xSe2. Applied Physics Letters, 104(1), [012101]. https://doi.org/10.1063/1.4834358