Rubbing-Induced Site-Selective Growth of MoS₂ Device Patterns

Area of Science:

• Materials Science
• Nanotechnology
• Device Fabrication

Background:

• Two-dimensional layered transition-metal dichalcogenides offer excellent electronic and mechanical properties for advanced devices.
• Conventional nanofabrication using lithography and etching introduces contaminants, degrading the performance of sensitive atomically thin materials.
• Current cleaning methods are insufficient to remove lithography-induced contaminants, hindering mass production of consistent layered material devices.

Purpose of the Study:

• To develop a novel, contamination-free method for patterning layered materials.
• To overcome the limitations of resist-based lithography in fabricating two-dimensional material devices.
• To enable the manufacturing of large arrays of layered material-based devices with uniform characteristics.

Main Methods:

• A damage-free mechanical rubbing process to create microscale triboelectric charge patterns on a dielectric surface.
• Site-selective deposition of few-layer molybdenum disulfide (MoS₂) guided by the induced charge patterns.
• Microscopy and finite element analysis to understand the relationship between charge patterns and MoS₂ morphology.

Main Results:

• Successful direct generation of few-layer MoS₂ device patterns without additional lithography or etching.
• Demonstrated control over MoS₂ pattern morphology based on the field magnitude distribution of triboelectric charge patterns.
• Fabricated working transistors and memristors using MoS₂ line patterns with high yield and good uniformity.

Conclusions:

• The rubbing-induced site-selective growth method offers a contamination-free alternative for fabricating layered material devices.
• This technique significantly improves the consistency and yield of devices like transistors and memristors made from MoS₂.
• The presented approach holds potential as a cost-efficient nanomanufacturing strategy for various layered materials.