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Low-temperature formation of epitaxial graphene on 6H-SiC induced by continuous electron beam irradiation

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14 Author(s)
Go, Heungseok ; School of Electrical and Computer Engineering, KIER-UNIST Advanced Center for Energy, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, South Korea ; Kwak, Jinsung ; Jeon, Youngeun ; Kim, Sung-Dae
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It is observed that epitaxial graphene forms on the surface of a 6H-SiC substrate by irradiating electron beam directly on the sample surface in high vacuum at relatively low temperature (∼670 °C). The symmetric shape and full width at half maximum of 2D peak in the Raman spectra indicate that the formed epitaxial graphene is turbostratic. The gradual change of the Raman spectra with electron beam irradiation time increasing suggests that randomly distributed small grains of epitaxial graphene form first and grow laterally to cover the entire irradiated area. The sheet resistance of epitaxial graphene film is measured to be ∼6.7 kΩ/sq.

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Applied Physics Letters  (Volume:101 ,  Issue: 9 )