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

Scientific Reports
Y KimY M Jhon

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 modu...Continue Reading

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Citations

May 2, 2018·Nanoscale·Youngbum KimJeongyong Kim
Aug 23, 2019·Nanoscale·Haiyan NanKostya Ken Ostrikov
Jan 1, 2019·Nanoscale Horizons : the Home for Rapid Reports of Exceptional Significance in Nanoscience and Nanotechnolgy·Peng LuoTianyou Zhai
Aug 14, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Daisuke KiriyaNorifumi Fujimura
Jan 16, 2020·ACS Applied Materials & Interfaces·Mengge LiYewu Wang

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Methods Mentioned

BETA
X-ray
atomic force microscopy
AFM

Software Mentioned

ATK

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