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Published on: July 24, 2015
Graphene nanoribbons grown in hBN stacks for high-performance electronics
Bosai Lyu1,2, Jiajun Chen1,2, Sen Wang3,4
1Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shenyang National Laboratory for Materials Science, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, China.
Researchers developed a new method for directly growing high-quality graphene nanoribbons (GNRs) within hexagonal boron nitride (hBN) stacks. This transfer-free approach enables the fabrication of high-performance electronic devices with improved GNR characteristics.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Van der Waals encapsulation using hexagonal boron nitride (hBN) stacks is crucial for high-performance 2D electronic devices.
- Current mechanical transfer methods for encapsulation are difficult to control, prone to contamination, and not scalable.
Purpose of the Study:
- To report a novel, transfer-free method for the direct growth of graphene nanoribbons (GNRs) embedded within hBN stacks.
- To characterize the properties of these directly grown GNRs and demonstrate their application in electronic devices.
Main Methods:
- Direct growth of graphene nanoribbons (GNRs) within hexagonal boron nitride (hBN) stacks.
- Atomistic simulations to understand the growth mechanism.
- Fabrication and characterization of GNR field-effect devices.
Main Results:
- Achieved transfer-free direct growth of ultralong (up to 0.25 mm), ultranarrow (<5 nm), and homochiral GNRs with zigzag edges.
- Atomistic simulations revealed ultralow GNR friction during sliding between AA'-stacked hBN layers as the growth mechanism.
- Demonstrated transfer-free fabrication of embedded GNR field-effect transistors with high room-temperature mobility (up to 4,600 cm² V⁻¹ s⁻¹) and on-off ratios (up to 10⁶).
Conclusions:
- The direct growth method overcomes limitations of mechanical transfer techniques for van der Waals encapsulation.
- This approach enables bottom-up fabrication of high-performance electronic devices utilizing embedded layered materials.
- The developed technique holds significant potential for advancing 2D electronics and novel device architectures.
