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

• Published in: Nano research Vol. 7; no. 4; pp. 561 - 571
• Main Authors: Buscema, Michele, Steele, Gary A., van der Zant, Herre S. J., Castellanos-Gomez, Andres
• Format: Journal Article
• Language: English
• Published: Heidelberg Tsinghua University Press 01-04-2014
• Subjects: Atomic/Molecular Structure and Spectra; Biomedicine; Biotechnology; Chemistry and Materials Science; Condensed Matter Physics; Materials Science; Nanotechnology; Research Article; 二硫化钼; 光发射; 光致发光光谱; 六方氮化硼; 单层; 基板; 拉曼光谱; 激子跃迁; van der Waals heterostructures; photoluminescence enhancement; molybdenum disulfide; photoluminescence quenching; substrate effect; Raman microscopy
• ISSN: 1998-0124; 1998-0000
• DOI: 10.1007/s12274-014-0424-0

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 Alg 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 MoSa-based vertical heterostructures and represent the first step in ad hoc tuning the PL emission of 1L MoS2 by selecting the proper substrate.