Plasma functionalization for cyclic transition between neutral and charged excitons in monolayer MoS2

Title
Plasma functionalization for cyclic transition between neutral and charged excitons in monolayer MoS2
Authors
전영민이석김철기전영인김영희J. Park
Keywords
plasma; functionalization; MoS2
Issue Date
2016-02
Publisher
Scientific Reports
Citation
VOL 6, 21405-1-21405-10
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/59088
ISSN
20452322
Appears in Collections:
KIST Publication > Article
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