Effect of ribbon width on electrical transport properties of graphene nanoribbons

Kyuhyun Bang, Sang Soo Chee, Kangmi Kim, Myungwoo Son, Hanbyeol Jang, Byoung Hun Lee, Kwang Hyeon Baik, Jae Min Myoung, Moon Ho Ham

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

There has been growing interest in developing nanoelectronic devices based on graphene because of its superior electrical properties. In particular, patterning graphene into a nanoribbon can open a bandgap that can be tuned by changing the ribbon width, imparting semiconducting properties. In this study, we report the effect of ribbon width on electrical transport properties of graphene nanoribbons (GNRs). Monolayer graphene sheets and Si nanowires (NWs) were prepared by chemical vapor deposition and a combination of nanosphere lithography and metal-assisted electroless etching from a Si wafer, respectively. Back-gated GNR field-effect transistors were fabricated on a heavily p-doped Si substrate coated with a 300 nm-thick SiO 2 layer, by O 2 reactive ion etching of graphene sheets using etch masks based on Si NWs aligned on the graphene between the two electrodes by a dielectrophoresis method. This resulted in GNRs with various widths in a highly controllable manner, where the on/off current ratio was inversely proportional to ribbon width. The field-effect mobility decreased with decreasing GNR widths due to carrier scattering at the GNR edges. These results demonstrate the formation of a bandgap in GNRs due to enhanced carrier confinement in the transverse direction and edge effects when the GNR width is reduced.

Original languageEnglish
Article number7
JournalNano Convergence
Volume5
Issue number1
DOIs
Publication statusPublished - 2018 Dec 1

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)

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    Bang, K., Chee, S. S., Kim, K., Son, M., Jang, H., Lee, B. H., Baik, K. H., Myoung, J. M., & Ham, M. H. (2018). Effect of ribbon width on electrical transport properties of graphene nanoribbons. Nano Convergence, 5(1), [7]. https://doi.org/10.1186/s40580-018-0139-0