Effect of graphene on photoluminescence properties of graphene/GeSi quantum dot hybrid structures

Graphene has been discovered to have two effects on the photoluminescence (PL) properties of graphene/GeSi quantum dot (QD) hybrid structures, which were formed by covering monolayer graphene sheet on the multilayer ordered GeSi QDs sample surfaces. At the excitation of 488 nm laser line, the hybrid...

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Bibliographic Details
Published in:Applied physics letters 2014-07, Vol.105 (2)
Main Authors: Chen, Y. L., Ma, Y. J., Chen, D. D., Wang, W. Q., Ding, K., Wu, Q., Fan, Y. L., Yang, X. J., Zhong, Z. Y., Xu, F., Jiang, Z. M.
Format: Article
Language:English
Subjects:
ABSORPTION
Applied physics
ATTENUATION
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
COVERINGS
ELECTRON TRANSFER
ELECTRONS
EXCITATION
GERMANIUM SILICIDES
GRAPHENE
Hybrid structures
HYBRID SYSTEMS
Incident light
LASER RADIATION
LAYERS
Multilayers
OPTICAL PROPERTIES
PHOTOLUMINESCENCE
Polaritons
QUANTUM DOTS
Surface chemistry
SURFACES
TIME RESOLUTION
VISIBLE RADIATION
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Summary:Graphene has been discovered to have two effects on the photoluminescence (PL) properties of graphene/GeSi quantum dot (QD) hybrid structures, which were formed by covering monolayer graphene sheet on the multilayer ordered GeSi QDs sample surfaces. At the excitation of 488 nm laser line, the hybrid structure had a reduced PL intensity, while at the excitation of 325 nm, it had an enhanced PL intensity. The attenuation in PL intensity can be attributed to the transferring of electrons from the conducting band of GeSi QDs to the graphene sheet. The electron transfer mechanism was confirmed by the time resolved PL measurements. For the PL enhancement, a mechanism called surface-plasmon-polariton (SPP) enhanced absorption mechanism is proposed, in which the excitation of SPP in the graphene is suggested. Due to the resonant excitation of SPP by incident light, the absorption of incident light is much enhanced at the surface region, thus leading to more exciton generation and a PL enhancement in the region. The results may be helpful to provide us a way to improve optical properties of low dimensional surface structures.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4889890