Formation of graphene nanoribbons on the macrofacets of vicinal 6H -SiC(0001) surfaces

Kohei Fukuma, Anton Visikovskiy, Takushi Iimori, Toshio Miyamachi, Fumio Komori, Tanaka Satoru

Research output: Contribution to journalArticlepeer-review

Abstract

Thermal decomposition of vicinal 6H-SiC(0001) surfaces with miscut angles toward the [11¯00] direction results in the appearance of pairs of (0001) macroterraces and (11¯0n) macrofacets covered with graphene, as follows. A carpetlike carbon layer grows on the surface, covering both the macroterraces and macrofacets; it forms a (63×63) buffer layer on the former ones, whereas its partial periodic bonding with the SiC steps on the latter ones generates a pseudographene nanoribbon (pseudo-GNR) array. The nanoribbons have a width of 1.7-1.8 nm and are aligned in the [112¯0] direction with a spatial periodicity of 3.3 nm. Scanning tunneling spectroscopy at a nanoribbon indicated a 0.4-0.5 eV energy gap and the Raman spectroscopy analysis of the pseudo-GNR array showed the absence of the 2D peak and the polarization dependence of the G and D peaks, which is typical of the armchair-edge nanoribbon.

Original languageEnglish
Article number124003
JournalPhysical Review Materials
Volume6
Issue number12
DOIs
Publication statusPublished - Dec 2022

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physics and Astronomy (miscellaneous)

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