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

doi:10.1021/acs.nanolett.7b00904

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

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

53 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 language	English
Pages (from-to)	4130-4136
Number of pages	7
Journal	Nano letters
Volume	17
Issue number	7
DOIs	https://doi.org/10.1021/acs.nanolett.7b00904
Publication status	Published - 2017 Jul 12

Bibliographical note

Funding Information:
This work was partially supported by ANR JCJC project milliPICS the Region Midi-Pyrenees under contract MESR 13053031, BLAPHENE project under IDEX program Emergence, Programme des Investissements d'Avenir under the program ANR-11-IDEX-0002-02 reference ANR-10-LABX-0037-NEXT, Swiss SNF Sinergia Grant 147607 the European Commission (ITN MoWSeS, GA 317451), and Deutsche Forschungsgemeinschaft (HE 3543/27-1 and GRK 2247/1 (QM3)).

Publisher Copyright:
© 2017 American Chemical Society.

All Science Journal Classification (ASJC) codes

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

Access to Document

10.1021/acs.nanolett.7b00904

Cite this

@article{915e289bb3ca4d3fb7f53eb5a467d1e0,

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

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.",

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

note = "Funding Information: This work was partially supported by ANR JCJC project milliPICS the Region Midi-Pyrenees under contract MESR 13053031, BLAPHENE project under IDEX program Emergence, Programme des Investissements d'Avenir under the program ANR-11-IDEX-0002-02 reference ANR-10-LABX-0037-NEXT, Swiss SNF Sinergia Grant 147607 the European Commission (ITN MoWSeS, GA 317451), and Deutsche Forschungsgemeinschaft (HE 3543/27-1 and GRK 2247/1 (QM3)). Publisher Copyright: {\textcopyright} 2017 American Chemical Society.",

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T1 - Defect Healing and Charge Transfer-Mediated Valley Polarization in MoS2/MoSe2/MoS2 Trilayer van der Waals Heterostructures

AU - Surrente, Alessandro

AU - Dumcenco, Dumitru

AU - Yang, Zhuo

AU - Kuc, Agnieszka

AU - Jing, Yu

AU - Heine, Thomas

AU - Kung, Yen Cheng

AU - Maude, Duncan K.

AU - Kis, Andras

AU - Plochocka, Paulina

N1 - Funding Information: This work was partially supported by ANR JCJC project milliPICS the Region Midi-Pyrenees under contract MESR 13053031, BLAPHENE project under IDEX program Emergence, Programme des Investissements d'Avenir under the program ANR-11-IDEX-0002-02 reference ANR-10-LABX-0037-NEXT, Swiss SNF Sinergia Grant 147607 the European Commission (ITN MoWSeS, GA 317451), and Deutsche Forschungsgemeinschaft (HE 3543/27-1 and GRK 2247/1 (QM3)). Publisher Copyright: © 2017 American Chemical Society.

PY - 2017/7/12

Y1 - 2017/7/12

N2 - 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.

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