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Type: 
Journal
Description: 
In this work, we present a nanometer resolution structural characterization of epitaxial graphene (EG) layers grown on 4H-SiC (0001) 8° off-axis, by annealing in inert gas ambient (Ar) in a wide temperature range (T gr from 1600 to 2000°C). For all the considered growth temperatures, few layers of graphene (FLG) conformally covering the 100 to 200-nm wide terraces of the SiC surface have been observed by high-resolution cross-sectional transmission electron microscopy (HR-XTEM). Tapping mode atomic force microscopy (t-AFM) showed the formation of wrinkles with approx. 1 to 2 nm height and 10 to 20 nm width in the FLG film, as a result of the release of the compressive strain, which builds up in FLG during the sample cooling due to the thermal expansion coefficients mismatch between graphene and SiC. While for EG grown on on-axis 4H-SiC an isotropic mesh-like network of wrinkles …
Publisher: 
Springer New York
Publication date: 
1 Dec 2011
Authors: 

Carmelo Vecchio, Sushant Sonde, Corrado Bongiorno, Martin Rambach, Rositza Yakimova, Vito Raineri, Filippo Giannazzo

Biblio References: 
Volume: 6 Issue: 1 Pages: 269
Origin: 
Nanoscale research letters