Work

Tunable transport gap in narrow bilayer graphene nanoribbons

Year: 2013

Type: article

Abstract: The lack of a bandgap makes bulk graphene unsuitable for room temperature transistors with a sufficient on/off current ratio. Lateral constriction of charge carriers in graphene nanostructures or vertical inversion symmetry breaking in bilayer graphene are two potential strategies to mitigate this challenge, but each alone is insufficient to consistently achieve a large enough on/off ratio (e.g. > 1000) for typical logic applications. Herein we report the combination of lateral carrier constriction and vertical inversion symmetry breaking in bilayer graphene nanoribbons (GNRs) to tune their transport gaps and improve the on/off ratio. Our studies demonstrate that the on/off current ratio of bilayer GNRs can be systematically increased upon applying a vertical electric field, to achieve a largest on/off current ratio over 3000 at room temperature.

Source: Scientific Reports

DOI: 10.1038/srep01248

Authors: Woo Jong Yu, Xiangfeng Duan

Institutions: University of California, Los Angeles, Sungkyunkwan University, California NanoSystems Institute

Language: English

Topic: Graphene research and applications

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,690

Funders: National Science Foundation, National Research Foundation, National Research Foundation of Korea, Ministry of Education, Science and Technology