Research Article

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2014, 7(4): 561–571

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https://doi.org/10.1007/s12274-014-0424-0

The effect of the substrate on the Raman and photoluminescence emission of single-layer MoS2

Michele Buscema (*), Gary A. Steele (*), Herre S. J. van der Zant, and Andres Castellanos-Gomez (*)

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Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands

Keywords: molybdenum disulfide, van der Waals heterostructures, Raman microscopy, photoluminescence enhancement, photoluminescence quenching, substrate effect
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  • Abstract
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We quantitatively study the Raman and photoluminescence (PL) emission from single-layer molybdenum disulfide (MoS2) on dielectric (SiO2, hexagonal boron nitride, mica and the polymeric dielectric Gel-Film®) and conducting substrates (Au and few-layer graphene). We find that the substrate can affect the Raman and PL emission in a twofold manner. First, the absorption and emission intensities are strongly modulated by the constructive/destructive interference within the different substrates. Second, the position of the A1g Raman mode peak and the spectral weight between neutral and charged excitons in the PL spectra are modified by the substrate. We attribute this effect to substrate-induced changes in the doping level and in the decay rates of the excitonic transitions. Our results provide a method to quantitatively study the Raman and PL emission from MoS2-based vertical heterostructures and represent the first step in ad hoc tuning the PL emission of 1L MoS2 by selecting the proper substrate. 1 Introduction
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The effect of the substrate on the Raman and photoluminescence emission of single-layer MoS2. Nano Res. 2014, 7(4): 561–571 https://doi.org/10.1007/s12274-014-0424-0

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