Effective Modulation of Interlayer Excitons in WSe2/WS2 Heterostructures by Plasmon–Exciton Interaction

Zheng, Ting; Zhao, Xinwei; Yang, Fang; Song, Junming; Zhao, Weiwei; Zhao, Hui; Ni, Zhenhua

doi:10.1021/acsphotonics.3c01447

Effective Modulation of Interlayer Excitons in WSe₂/WS₂ Heterostructures by Plasmon–Exciton Interaction

Journal Article · Wed Jan 10 00:00:00 EST 2024 · ACS Photonics

DOI:https://doi.org/10.1021/acsphotonics.3c01447· OSTI ID:2242380

^[1]; Zhao, Xinwei ^[2]; Yang, Fang ^[3]; Song, Junming ^[2]; Zhao, Weiwei ^[2]; ^[4]; ^[5]

Southeast Univ., Nanjing (China). School of Physics; The University of Kansas
Southeast Univ., Nanjing (China). School of Physics
Nanjing Normal University, Nanjing (China)
Univ. of Kansas, Lawrence, KS (United States)
Southeast Univ., Nanjing (China). School of Physics; Purple Mountain Laboratories, Nanjing (China)

Effective charge transfer and carrier separation at the interface are paramount for optimizing the performance of devices based on van der Waals heterostructures. In this investigation, surface plasmons generated by gold nanoparticles are employed to modulate the photocarrier dynamics in WSe₂/WS₂ heterostructures. The results of pump-probe measurements reveal that the efficiency of carrier transfer across the WSe₂/WS₂ heterostructure interface can be significantly enhanced via energy transfer mechanisms mediated by gold plasmons. Moreover, the electric field engendered by the plasmonic oscillations can modulate the dipole moment of the interlayer exciton. These well-aligned excitons avoid the annihilation and the extension of the lifetime of the excitons with increased pump power is realized by screening effect. The findings presented herein offer valuable insights for the active manipulation of charge transfer and extend our understanding of the integral role played by plasmon-exciton coupling in mediating charge separation in van der Waals heterostructures.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Kansas, Lawrence, KS (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0020995

OSTI ID:: 2242380

Journal Information:: ACS Photonics, Journal Name: ACS Photonics Journal Issue: 2 Vol. 11; ISSN 2330-4022

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Charge transfer
Excitons
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Metal nanoparticles
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Effective Modulation of Interlayer Excitons in WSe2/WS2 Heterostructures by Plasmon–Exciton Interaction

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References (17)

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Effective Modulation of Interlayer Excitons in WSe₂/WS₂ Heterostructures by Plasmon–Exciton Interaction