Abstract：We demonstrate a simple while very effective approach to tune the photoluminescence (PL) performance of monolayer MoS2 by dipping into the H2O2 aqueous solution, which is a strong oxidizer that extracts electrons from the MoS2 sheet within several seconds without damaging the crystal structure. During this process, the trion (electron-coupled exciton, X?) is transformed into an exciton (Xo), and thus achieves a greatly enhanced PL performance. These results indicate a convenient way to tune and to control the PL luminescence from monolayer MoS2 and thus lay a basis for the MoS2-based optoelectronic application.
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2015, Vol. 32 
