Energy and Charge Transfer in Hybrid Heterostructures Consisting of MoS₂ Monolayers and Fluorescent Organic Molecules

2D transition metal dichalcogenides (TMDs), with bandgap energies corresponding to near-infrared and visible light ranges, are promising materials for photodetectors, light emitting diodes, and solar cells. Organic semiconductors have distinct physical properties compared with inorganic counterparts: large binding energy of excitons, flexibility, and low dielectric constant. In this work, newly-developed p-conjugated organic molecules, named DY1, were integrated with MoS₂ monolayers grown on quartz substrates. We investigated photoluminescence (PL) characteristics of the DY1/MoS₂ hybrid heterostructures. The micro-PL measurements and wide-field PL image showed that the MoS₂ monolayers could change the spectra and reduce the intensity of the PL emission from DY1. The emission lifetime at the DY1/MoS₂ was larger than that of bare DY1. Kelvin probe force microscopy measurements under illumination helped us to visualize the light-induced contact potential difference at the DY1/MoS₂ interface. In the presentation, we will discuss the energy and charge transfer processes at the DY1/MoS₂ organic/inorganic heterointerfaces, based on the experimental results including energy band diagrams.