Tunable Doping in Hydrogenated Single Layered Molybdenum Disulfide

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Structural defects in molybdenum disulfide (MoS2) monolayers significantly impact their electronic properties.
• Understanding and controlling these defects is crucial for tailoring MoS2 functionality.

Purpose of the Study:

• To investigate the incorporation of atomic hydrogen in monolayer MoS2 for defect tuning.
• To demonstrate the ability to control the electronic doping of MoS2 from n-type to p-type.

Main Methods:

• Controlled exposure of monolayer MoS2 to atomic hydrogen at room temperature.
• Characterization using high-resolution X-ray photoemission spectroscopy (XPS) and density functional theory (DFT) calculations.
• Validation of material quality and hydrogenation efficiency via micro-Raman spectroscopy and angle-resolved photoemission spectroscopy (ARPES).

Main Results:

• Atomic hydrogen successfully incorporates into monolayer MoS2, modifying its electronic properties.
• Tunable doping from electron (n) to hole (p) type is achieved.
• Hydrogenation effectively saturates sulfur vacancies in MoS2 flakes, enhancing material quality.

Conclusions:

• MoS2 hydrogenation is a viable and efficient method for tuning electronic properties.
• This technique offers a pathway for controllable doping of transition metal dichalcogenides (TMDs) using non-TMD elements.