Kim, Y. Jhon, Y. I. Park, J. Kim, C. Lee, S. Jhon, Y. M. 2024-01-20T05:00:56Z 2024-01-20T05:00:56Z 2021-09-04 2016-02-22 2045-2322 https://pubs.kist.re.kr/handle/201004/124375 Monolayer MoS2 (1L-MoS2) has photoluminescence (PL) properties that can greatly vary via transition between neutral and charged exciton PLs depending on carrier density. Here, for the first time, we present a chemical doping method for reversible transition between neutral and charged excitons of 1L-MoS2 using chlorine-hydrogen-based plasma functionalization. The PL of 1L-MoS2 is drastically increased by p-type chlorine plasma doping in which its intensity is easily tuned by controlling the plasma treatment duration. We find that despite their strong adhesion, a post hydrogen plasma treatment can very effectively dedope chlorine adatoms in a controllable way while maintaining robust structural integrity, which enables well-defined reversible PL control of 1L-MoS2. After exhaustive chlorine dedoping, the hydrogen plasma process induces n-type doping of 1L-MoS2, degrading the PL further, which can also be recovered by subsequent chlorine plasma treatment, extending the range of tunable PL into a bidirectional regime. This cyclically-tunable carrier doping method can be usefully employed in fabricating highly-tunable n- and p-type domains in monolayer transition-metal dichalcogenides suitable for two-dimensional electro-optic modulators, on-chip lasers, and spin-and valley-polarized light-emitting diodes. English NATURE RESEARCH MOLYBDENUM-DISULFIDE MOS2 SATURABLE ABSORBER LIGHT-EMISSION LAYER PHOTOLUMINESCENCE EVOLUTION DYNAMICS DIODES BULK WS2 Plasma functionalization for cyclic transition between neutral and charged excitons in monolayer MoS2 Article 10.1038/srep21405 1 SCIENTIFIC REPORTS, v.6 SCIENTIFIC REPORTS 6 scie scopus 000370494200001 2-s2.0-84959422100 Multidisciplinary Sciences Science & Technology - Other Topics Article MOLYBDENUM-DISULFIDE MOS2 SATURABLE ABSORBER LIGHT-EMISSION LAYER PHOTOLUMINESCENCE EVOLUTION DYNAMICS DIODES BULK WS2 plasma functionalization MoS2