Maskless Synthesis of van der Waals Heterostructure Arrays Engineered for Light Harvesting on Large Area Templates

Area of Science:

• Materials Science
• Nanotechnology
• Photonics

Background:

• Large-area fabrication of van der Waals heterostructures is crucial for practical applications.
• 2D Transition Metal Dichalcogenide (TMD) semiconductors offer unique electronic and optical properties.
• Controlling light-matter interactions in 2D materials is key for advanced devices.

Purpose of the Study:

• To develop a scalable method for fabricating van der Waals heterostructure arrays.
• To engineer enhanced light harvesting in 2D TMDs.
• To explore the potential of these platforms for photoconversion, photocatalysis, and energy storage.

Main Methods:

• Utilized Ion Beam Sputtering for physical deposition of TMDs.
• Fabricated silica substrates with nanoridges using interference lithography.
• Employed maskless deposition of TMDs at glancing angles to create WS₂ nanostripes coated with MoS₂.

Main Results:

• Achieved large-area stacking of van der Waals heterostructure arrays.
• Demonstrated resonant enhancement of optical absorption by up to 450% compared to flat heterostructures.
• Engineered photon harvesting in the flat optics regime by optimizing WS₂ nanostripe thickness.

Conclusions:

• The novel 2D-TMD platform enables efficient light trapping and steering.
• The developed fabrication process is scalable for real-world applications.
• These heterostructures show significant promise for energy-related technologies.