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Published on: December 5, 2015
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Plasma functionalization for cyclic transition between neutral and charged excitons in monolayer MoS2
1Sensor System Research Center, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea.
Scientific Reports
|February 23, 2016
Summary
Researchers developed a chemical doping method using chlorine-hydrogen plasma to control the photoluminescence (PL) of monolayer MoS2. This reversible process allows tuning PL intensity for advanced 2D electronic devices.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Monolayer MoS2 exhibits photoluminescence (PL) sensitive to carrier density, enabling transitions between neutral and charged excitons.
- Controlling carrier density is crucial for tuning 1L-MoS2 optoelectronic properties.
Purpose of the Study:
- To introduce a novel chemical doping method for reversible control of neutral and charged excitons in 1L-MoS2.
- To demonstrate the use of chlorine-hydrogen plasma functionalization for tunable PL in 1L-MoS2.
Main Methods:
- Utilized chlorine-hydrogen-based plasma functionalization for chemical doping of 1L-MoS2.
- Investigated p-type doping via chlorine plasma and subsequent n-type doping/dedoping with hydrogen plasma.
- Controlled PL intensity by adjusting plasma treatment duration.
Main Results:
- Achieved drastic PL enhancement in 1L-MoS2 through p-type chlorine plasma doping, with tunable intensity.
- Demonstrated effective and controllable dedoping of chlorine using hydrogen plasma, preserving structural integrity.
- Extended PL tunability into a bidirectional regime by alternating chlorine and hydrogen plasma treatments.
Conclusions:
- Developed a cyclically-tunable carrier doping method for 1L-MoS2 using plasma functionalization.
- This method enables the fabrication of precisely controlled n- and p-type domains in 2D materials.
- Potential applications include 2D electro-optic modulators, on-chip lasers, and spin/valley-polarized LEDs.
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