Enhanced interlayer neutral excitons and trions in trilayer van der Waals heterostructures

Chanyeol Choi, Jiahui Huang, Hung Chieh Cheng, Hyunseok Kim, Abhinav Kumar Vinod, Sang Hoon Bae, V. Ongun Özçelik, Roberto Grassi, Jongjae Chae, Shu Wei Huang, Xiangfeng Duan, Kristen Kaasbjerg, Tony Low, Chee Wei Wong

Research output: Contribution to journalArticle

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Abstract

Vertically stacked van der Waals heterostructures constitute a promising platform for providing tailored band alignment with enhanced excitonic systems. Here, we report observations of neutral and charged interlayer excitons in trilayer WSe2–MoSe2–WSe2 van der Waals heterostructures and their dynamics. The addition of a WSe2 layer in the trilayer leads to significantly higher photoluminescence quantum yields and tunable spectral resonance compared to its bilayer heterostructures at cryogenic temperatures. The observed enhancement in the photoluminescence quantum yield is due to significantly larger electron–hole overlap and higher light absorbance in the trilayer heterostructure, supported via first-principles pseudopotential calculations based on spin-polarized density functional theory. We further uncover the temperature- and power-dependence, as well as time-resolved photoluminescence of the trilayer heterostructure interlayer neutral excitons and trions. Our study elucidates the prospects of manipulating light emission from interlayer excitons and designing atomic heterostructures from first-principles for optoelectronics.

Original languageEnglish (US)
Article number30
Journalnpj 2D Materials and Applications
Volume2
Issue number1
DOIs
StatePublished - Dec 1 2018

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Excitons
Heterojunctions
interlayers
excitons
photoluminescence
Photoluminescence
Quantum yield
cryogenic temperature
pseudopotentials
light emission
platforms
alignment
density functional theory
augmentation
Light emission
Optoelectronic devices
Cryogenics
Density functional theory
LDS 751
Temperature

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Enhanced interlayer neutral excitons and trions in trilayer van der Waals heterostructures. / Choi, Chanyeol; Huang, Jiahui; Cheng, Hung Chieh; Kim, Hyunseok; Vinod, Abhinav Kumar; Bae, Sang Hoon; Özçelik, V. Ongun; Grassi, Roberto; Chae, Jongjae; Huang, Shu Wei; Duan, Xiangfeng; Kaasbjerg, Kristen; Low, Tony; Wong, Chee Wei.

In: npj 2D Materials and Applications, Vol. 2, No. 1, 30, 01.12.2018.

Research output: Contribution to journalArticle

Choi, C, Huang, J, Cheng, HC, Kim, H, Vinod, AK, Bae, SH, Özçelik, VO, Grassi, R, Chae, J, Huang, SW, Duan, X, Kaasbjerg, K, Low, T & Wong, CW 2018, 'Enhanced interlayer neutral excitons and trions in trilayer van der Waals heterostructures', npj 2D Materials and Applications, vol. 2, no. 1, 30. https://doi.org/10.1038/s41699-018-0075-1, https://doi.org/10.1038/s41699-018-0075-1
Choi, Chanyeol ; Huang, Jiahui ; Cheng, Hung Chieh ; Kim, Hyunseok ; Vinod, Abhinav Kumar ; Bae, Sang Hoon ; Özçelik, V. Ongun ; Grassi, Roberto ; Chae, Jongjae ; Huang, Shu Wei ; Duan, Xiangfeng ; Kaasbjerg, Kristen ; Low, Tony ; Wong, Chee Wei. / Enhanced interlayer neutral excitons and trions in trilayer van der Waals heterostructures. In: npj 2D Materials and Applications. 2018 ; Vol. 2, No. 1.
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