Synergetic photoluminescence enhancement of monolayer MoS2via surface plasmon resonance and defect repair

The weak light-absorption and low quantum yield (QY) in monolayer MoS2 are great challenges for the applications of this material in practical optoelectronic devices. Here, we report on a synergistic strategy to obtain highly enhanced photoluminescence (PL) of monolayer MoS2 by simultaneously improv...

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Published in:RSC advances 2018-01, Vol.8 (42), p.23591-23598
Main Authors: Zeng, Yi, Chen, Weibing, Tang, Bin, Liao, Jianhui, Lou, Jun, Chen, Qing
Format: Article
Language:English
Subjects:
Chemistry
Electromagnetic fields
Excitation spectra
Gold
Molybdenum disulfide
Monolayers
Optoelectronic devices
Photoluminescence
Self-assembly
Surface plasmon resonance
Trifluoromethane
Trions
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container_issue 42
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creator Zeng, Yi
Chen, Weibing
Tang, Bin
Liao, Jianhui
Lou, Jun
Chen, Qing
description The weak light-absorption and low quantum yield (QY) in monolayer MoS2 are great challenges for the applications of this material in practical optoelectronic devices. Here, we report on a synergistic strategy to obtain highly enhanced photoluminescence (PL) of monolayer MoS2 by simultaneously improving the intensity of the electromagnetic field around MoS2 and the QY of MoS2. Self-assembled sub-monolayer Au nanoparticles underneath the monolayer MoS2 and bis(trifluoromethane)sulfonimide (TFSI) treatment to the MoS2 surface are used to boost the excitation field and the QY, respectively. An enhancement factor of the PL intensity as high as 280 is achieved. The enhancement mechanisms are analyzed by inspecting the contribution of the PL spectra from A excitons and A− trions under different conditions. Our study takes a further step to developing high-performance optoelectronic devices based on monolayer MoS2.
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subjects Chemistry
Electromagnetic fields
Excitation spectra
Gold
Molybdenum disulfide
Monolayers
Optoelectronic devices
Photoluminescence
Self-assembly
Surface plasmon resonance
Trifluoromethane
Trions
title Synergetic photoluminescence enhancement of monolayer MoS2via surface plasmon resonance and defect repair
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