Article Title

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

Authors

Michele Buscema, Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
Gary A. Steele, Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
Herre S. J. van der Zant, Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
Andres Castellanos-Gomez, 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

Abstract

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

Graphical Abstract

DOI

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

Publisher

Tsinghua University Press

Recommended Citation

Michele Buscema,Gary A. Steele,Herre S. J. van der Zant,Andres Castellanos-Gomez, The effect of the substrate on the Raman and photoluminescence emission of single-layer MoS2. NanoRes.2014, 7(4): 561–571