Mechanistic Insight to the Chemical Treatments of Monolayer Transition Metal Disulfides for Photoluminescence Enhancement

摘要: There is a growing interest in obtaining high quality monolayer transition metal disulfides (TMDSs) for optoelectronic device applications. Surface chemical treatments using range of chemicals on TMDSs have proven effective to improve their photoluminescence (PL) yield. However, the underlying mechanism PL enhancement by these not clear, which prevents rational design passivation strategies. In this work, simple and approach significantly enhance demonstrated family cation donors, we show be much more than commonly used p-dopants achieve through electron transfer. We develop detailed mechanistic picture action donors demonstrate that one them, Li-TFSI (bistriflimide), enhances both MoS2 WS2 level double compared widely discussed currently best performing super acid H-TFSI treatment. addition, ionic salts are compatible with greener solvents easier handle super-acids, provides possibility directly treating during fabrication. This work sets up selection rules passivate increases potential practical