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In this paper, micro-Raman mapping and conductive atomic force microscopy (C-AFM) were jointly applied to investigate the structural and electrical homogeneity of quasi-free-standing monolayer graphene (QFMLG), obtained by high temperature decomposition of 4H-SiC (0001) followed by hydrogen intercalation at 900 C. Strain and doping maps, obtained by Raman data, showed the presence of sub-micron patches with reduced hole density correlated to regions with higher compressive strain, probably associated with a locally reduced hydrogen intercalation. Nanoscale resolution electrical maps by C-AFM also revealed the presence of patches with enhanced current injection through the QFMLG/SiC interface, indicating a locally reduced Schottky barrier height (Φ B). The Φ B values evaluated from local I–V curves by the thermionic emission model were in good agreement with the values calculated for the …
IOP Publishing
Publication date: 
24 Apr 2019

F Giannazzo, Ivan Shtepliuk, Ivan Gueorguiev Ivanov, Tihomir Iakimov, A Kakanakova-Georgieva, E Schilirò, P Fiorenza, Rositsa Yakimova

Biblio References: 
Volume: 30 Issue: 28 Pages: 284003