The maximum oscillation frequency (fmax) quantifies the practical upper bound for useful circuit operation. We report here an fmax of 70 GHz in transistors using epitaxial graphene grown on the C-face of SiC. This is a significant improvement over Si-face epitaxial graphene used in the prior high frequency transistor studies, exemplifying the superior electronics potential of C-face epitaxial graphene. Careful transistor design using a high {\kappa} dielectric T-gate and self-aligned contacts, further contributed to the record-breaking fmax.
Cite
@article{arxiv.1302.3907,
title = {Record Maximum Oscillation Frequency in C-face Epitaxial Graphene Transistors},
author = {Zelei Guo and Rui Dong and Partha Sarathi Chakraborty and Nelson Lourenco and James Palmer and Yike Hu and Ming Ruan and John Hankinson and Jan Kunc and John D. Cressler and Claire Berger and Walt A. de Heer},
journal= {arXiv preprint arXiv:1302.3907},
year = {2015}
}