Defect Healing and Charge Transfer-Mediated Valley Polarization in MoS2/MoSe2/MoS2 Trilayer van der Waals Heterostructures

Alessandro Surrente, Dumitru Dumcenco, Zhuo Yang, Agnieszka Kuc, Yu Jing, Thomas Heine, Yen Cheng Kung, Duncan K. Maude, Andras Kis, Paulina Plochocka

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29 Citations (Scopus)

Abstract

Monolayer transition metal dichalcogenides (TMDCs) grown by chemical vapor deposition (CVD) are plagued by a significantly lower optical quality compared to exfoliated TMDCs. In this work, we show that the optical quality of CVD-grown MoSe2 is completely recovered if the material is sandwiched in MoS2/MoSe2/MoS2 trilayer van der Waals heterostructures. We show by means of density functional theory that this remarkable and unexpected result is due to defect healing: S atoms of the more reactive MoS2 layers are donated to heal Se vacancy defects in the middle MoSe2 layer. In addition, the trilayer structure exhibits a considerable charge-transfer mediated valley polarization of MoSe2 without the need for resonant excitation. Our fabrication approach, relying solely on simple flake transfer technique, paves the way for the scalable production of large-area TMDC materials with excellent optical quality.

Original languageEnglish
Pages (from-to)4130-4136
Number of pages7
JournalNano letters
Volume17
Issue number7
DOIs
Publication statusPublished - 2017 Jul 12

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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    Surrente, A., Dumcenco, D., Yang, Z., Kuc, A., Jing, Y., Heine, T., Kung, Y. C., Maude, D. K., Kis, A., & Plochocka, P. (2017). Defect Healing and Charge Transfer-Mediated Valley Polarization in MoS2/MoSe2/MoS2 Trilayer van der Waals Heterostructures. Nano letters, 17(7), 4130-4136. https://doi.org/10.1021/acs.nanolett.7b00904