MoS2 has a variety of applications including photovoltaics, energy storage, optoelectronics, and catalysis. Chemical vapor deposition-grown and mechanically exfoliated MoS2 monolayers have been modified by chemical treatment and doping to improve their light-matter interactions for optoelectronic devices. The performance of ideal MoS2 devices could change under realistic conditions. Correlation of the chemistry of MoS2 from ideal material to defective material under ambient environment is critical to its various applications. Here the effect of laser irradiation on the optical properties of MoS2 in ambient conditions has been studied using Raman micro-spectroscopy. The results show that there are photo-induced reactions of molecules (O2 and H2O) with the MoS2 monolayer in the ambient conditions and the reactions strongly affect the photoluminescence of MoS2. The mapping of the flakes shows that the reaction depends on the spatial location. The PL of the edge of the MoS2 monolayer flakes changes dramatically under irritations while the PL of MoS2 on the monolayer stays almost unchanged.

Photoreactions of monolayer MoS2 in ambient conditions

256th National Meeting (2018)

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