Exciton tuning in monolayer WSe2 via substrate induced electron doping

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Exciton tuning in monolayer WSe2 via substrate induced electron doping. / Pan, Yang; Rahaman, Mahfujur; He, Lu et al.
In: Nanoscale advances, Vol. 2022, No. 23, 25.10.2022.

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

Harvard

Pan, Y, Rahaman, M, He, L, Milekhin, I, Manoharan, G, Aslam, MA, Blaudeck, T, Willert, A, Matkovic, A, Madeira, TI & Zahn, DRT 2022, 'Exciton tuning in monolayer WSe2 via substrate induced electron doping', Nanoscale advances, vol. 2022, no. 23. https://doi.org/10.1039/d2na00495j

APA

Pan, Y., Rahaman, M., He, L., Milekhin, I., Manoharan, G., Aslam, M. A., Blaudeck, T., Willert, A., Matkovic, A., Madeira, T. I., & Zahn, D. R. T. (2022). Exciton tuning in monolayer WSe2 via substrate induced electron doping. Nanoscale advances, 2022(23). Advance online publication. https://doi.org/10.1039/d2na00495j

Vancouver

Pan Y, Rahaman M, He L, Milekhin I, Manoharan G, Aslam MA et al. Exciton tuning in monolayer WSe2 via substrate induced electron doping. Nanoscale advances. 2022 Oct 25;2022(23). Epub 2022 Oct 25. doi: 10.1039/d2na00495j

Author

Pan, Yang ; Rahaman, Mahfujur ; He, Lu et al. / Exciton tuning in monolayer WSe2 via substrate induced electron doping. In: Nanoscale advances. 2022 ; Vol. 2022, No. 23.

Bibtex - Download

@article{85b3cbafb5b042238d04e2a69640f561,
title = "Exciton tuning in monolayer WSe2 via substrate induced electron doping",
abstract = "We report large exciton tuning in WSe2 monolayers via substrate induced non-degenerate doping. We observe a redshift of ∼62 meV for the A exciton together with a 1–2 orders of magnitude photoluminescence (PL) quenching when the monolayer WSe2 is brought in contact with highly oriented pyrolytic graphite (HOPG) compared to dielectric substrates such as hBN and SiO2. As the evidence of doping from HOPG to WSe2, a drastic increase of the intensity ratio of trions to neutral excitons was observed. Using a systematic PL and Kelvin probe force microscopy (KPFM) investigation on WSe2/ HOPG, WSe2/hBN, and WSe2/graphene, we conclude that this unique excitonic behavior is induced byelectron doping from the substrate. Our results propose a simple yet efficient way for exciton tuning in monolayer WSe2, which plays a central role in the fundamental understanding and further device development.",
author = "Yang Pan and Mahfujur Rahaman and Lu He and Ilya Milekhin and Gopinath Manoharan and Aslam, {Muhammad Awais} and Thomas Blaudeck and Andreas Willert and Aleksandar Matkovic and Madeira, {Teresa I.} and Zahn, {Dietrich R.T.}",
note = "Publisher Copyright: {\textcopyright} The Royal Society of Chemistry 2022.",
year = "2022",
month = oct,
day = "25",
doi = "10.1039/d2na00495j",
language = "English",
volume = "2022",
journal = "Nanoscale advances",
issn = "2516-0230",
publisher = "Royal Society of Chemistry",
number = "23",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Exciton tuning in monolayer WSe2 via substrate induced electron doping

AU - Pan, Yang

AU - Rahaman, Mahfujur

AU - He, Lu

AU - Milekhin, Ilya

AU - Manoharan, Gopinath

AU - Aslam, Muhammad Awais

AU - Blaudeck, Thomas

AU - Willert, Andreas

AU - Matkovic, Aleksandar

AU - Madeira, Teresa I.

AU - Zahn, Dietrich R.T.

N1 - Publisher Copyright: © The Royal Society of Chemistry 2022.

PY - 2022/10/25

Y1 - 2022/10/25

N2 - We report large exciton tuning in WSe2 monolayers via substrate induced non-degenerate doping. We observe a redshift of ∼62 meV for the A exciton together with a 1–2 orders of magnitude photoluminescence (PL) quenching when the monolayer WSe2 is brought in contact with highly oriented pyrolytic graphite (HOPG) compared to dielectric substrates such as hBN and SiO2. As the evidence of doping from HOPG to WSe2, a drastic increase of the intensity ratio of trions to neutral excitons was observed. Using a systematic PL and Kelvin probe force microscopy (KPFM) investigation on WSe2/ HOPG, WSe2/hBN, and WSe2/graphene, we conclude that this unique excitonic behavior is induced byelectron doping from the substrate. Our results propose a simple yet efficient way for exciton tuning in monolayer WSe2, which plays a central role in the fundamental understanding and further device development.

AB - We report large exciton tuning in WSe2 monolayers via substrate induced non-degenerate doping. We observe a redshift of ∼62 meV for the A exciton together with a 1–2 orders of magnitude photoluminescence (PL) quenching when the monolayer WSe2 is brought in contact with highly oriented pyrolytic graphite (HOPG) compared to dielectric substrates such as hBN and SiO2. As the evidence of doping from HOPG to WSe2, a drastic increase of the intensity ratio of trions to neutral excitons was observed. Using a systematic PL and Kelvin probe force microscopy (KPFM) investigation on WSe2/ HOPG, WSe2/hBN, and WSe2/graphene, we conclude that this unique excitonic behavior is induced byelectron doping from the substrate. Our results propose a simple yet efficient way for exciton tuning in monolayer WSe2, which plays a central role in the fundamental understanding and further device development.

UR - http://www.scopus.com/inward/record.url?scp=85141798185&partnerID=8YFLogxK

U2 - 10.1039/d2na00495j

DO - 10.1039/d2na00495j

M3 - Article

VL - 2022

JO - Nanoscale advances

JF - Nanoscale advances

SN - 2516-0230

IS - 23

ER -

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