Exciton tuning in monolayer WSe2 via substrate induced electron doping

Yang Pan; Mahfujur Rahaman; Lu He; Ilya Milekhin; Gopinath Manoharan; Muhammad Awais Aslam; Thomas Blaudeck; Andreas Willert; Aleksandar Matković; Teresa I Madeira; Dietrich R T Zahn

doi:10.1039/d2na00495j

Exciton tuning in monolayer WSe2 via substrate induced electron doping

Yang Pan, Mahfujur Rahaman, Lu He, Ilya Milekhin, Gopinath Manoharan, Muhammad Awais Aslam, Thomas Blaudeck, Andreas Willert, Aleksandar Matković, Teresa I Madeira, Dietrich R T Zahn

Результат исследования: Научные публикации в периодических изданиях › статья › рецензирование

Аннотация

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 by electron 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.

Язык оригинала	английский
Страницы (с-по)	5102-5108
Число страниц	7
Журнал	Nanoscale Advances
Том	4
Номер выпуска	23
DOI	https://doi.org/10.1039/d2na00495j
Состояние	Опубликовано - 22 нояб. 2022
Опубликовано для внешнего пользования	Да

Предметные области OECD FOS+WOS

1.03 ФИЗИЧЕСКИЕ НАУКИ И АСТРОНОМИЯ
2.11 ПРОЧИЕ ТЕХНОЛОГИИ
1.04 ХИМИЧЕСКИЕ НАУКИ
2.05 ТЕХНОЛОГИЯ МАТЕРИАЛОВ

Доступ к документу

10.1039/d2na00495j

Другие файлы и ссылки

https://www.mendeley.com/catalogue/185e4bf9-c3ad-369c-8e46-9eec3e45d217/

Цитировать

@article{bf4cb5339f0740c19e82a575245a0a48,

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 by electron 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 Matkovi{\'c} and Madeira, {Teresa I} and Zahn, {Dietrich R T}",

note = "Acknowledgements: The authors gratefully acknowledge fnancial support by the Deutsche Forschungsgemeinschaft (DFG, projects ZA 146/43-1 and ZA 146/47-1). M. A. A. and A. M. acknowledge financial support by the Austrian Science Fund (FWF) under the grant no. I4323-N36. We thank Manuel Monecke for helping with the UPS measurement. This journal is {\textcopyright} The Royal Society of Chemistry.",

year = "2022",

month = nov,

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doi = "10.1039/d2na00495j",

language = "English",

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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 - Matković, Aleksandar

AU - Madeira, Teresa I

AU - Zahn, Dietrich R T

N1 - Acknowledgements: The authors gratefully acknowledge fnancial support by the Deutsche Forschungsgemeinschaft (DFG, projects ZA 146/43-1 and ZA 146/47-1). M. A. A. and A. M. acknowledge financial support by the Austrian Science Fund (FWF) under the grant no. I4323-N36. We thank Manuel Monecke for helping with the UPS measurement. This journal is © The Royal Society of Chemistry.

PY - 2022/11/22

Y1 - 2022/11/22

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 by electron 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 by electron 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 - https://www.mendeley.com/catalogue/185e4bf9-c3ad-369c-8e46-9eec3e45d217/

U2 - 10.1039/d2na00495j

DO - 10.1039/d2na00495j

M3 - Article

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VL - 4

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EP - 5108

JO - Nanoscale Advances

JF - Nanoscale Advances

SN - 2516-0230

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