Influence of the substrate on the optical and photoelectrochemical properties of monolayer MoS2

ACS Applied Materials & Interfaces
Li WangJustin B Sambur

Abstract

Substrates influence the electrical and optical properties of monolayer (ML) MoS2 in field effect transistors and photodetectors. Photoluminescence (PL) and Raman spectroscopy measurements have shown that conducting substrates can vary the doping concentration and influence exciton decay channels in ML-MoS2. Doping and exciton decay dynamics are expected to play a major role in the efficiency of light-driven chemical reactions, but it is unclear to what extent these factors contribute to the photo(electro)catalytic properties of ML-MoS2. Here we report spatially resolved photoluminescence (PL), Raman, and photoelectrochemical current measurements of 5-10 µm-wide ML-MoS2 triangles deposited on pairs of indium-doped tin oxide (ITO) electrodes that are separated by a narrow insulating quartz channel (i.e., an ITO interdigitated array (IDA) electrode). Optical microscopy images and AFM measurements revealed that the ML-MoS2 triangles lie conformally on the quartz and ITO substrates. The PL spectrum of MoS2 shifts and decreases in intensity in the ITO region, which can be attributed to differences in non-radiative and radiative exciton decay channels. Raman spectra showed no significant peak shifts on the two substrates that would h...Continue Reading

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