Tuning a Schottky barrier of epitaxial graphene/4H-SiC (0001) by hydrogen intercalation

P. Dharmaraj, P. Justin Jesuraj, K. Jeganathan

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Abstract

We report the electron transport properties of epitaxial graphene (EG) grown on 4H-SiC (0001) by low energy electron-beam irradiation. As-grown EG (AEG) on SiC interface exhibits rectifying current-voltage characteristics with a low Schottky barrier (SB) of 0.55 ± 0.05 eV and high reverse current leakage. The SB of AEG/SiC junction is extremely impeded by the Fermi level pinning (FLP) above the Dirac point due to charged states at the interface. Nevertheless, a gentle hydrogen intercalation at 900 °C enables the alleviation of both FLP and carrier scattering owing to the saturation of dangling bonds as evidenced by the enhancement of SB (0.75 ± 0.05 eV) and high electron mobility well excess of 6000 cm2 V-1 s-1.

Original languageEnglish
Article number051605
JournalApplied Physics Letters
Volume108
Issue number5
DOIs
StatePublished - 1 Feb 2016

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