Record Maximum Oscillation Frequency in C-Face Epitaxial Graphene Transistors

Record maximum oscillation frequency in C-face epitaxial graphene transistors.

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 g...

Wafer-scale epitaxial graphene growth on the Si-face of hexagonal SiC „0001... for high frequency transistors

Up to two layers of epitaxial graphene have been grown on the Si-face of 2 in. SiC wafers exhibiting room-temperature Hall mobilities up to 2750 cm2 V−1 s−1, measured from ungated, large, 160 200 m2 Hall bars, and up to 4000 cm2 V−1 s−1, from top-gated, small, 1 1.5 m2 Hall bars. The growth process involved a combination of a cleaning step of the SiC in a Si-containing gas, followed by an annea...

Properties of epitaxial graphene grown on C-face SiC compared to Si-face

100-GHz transistors from wafer-scale epitaxial graphene.

The high carrier mobility of graphene has been exploited in field-effect transistors that operate at high frequencies. Transistors were fabricated on epitaxial graphene synthesized on the silicon face of a silicon carbide wafer, achieving a cutoff frequency of 100 gigahertz for a gate length of 240 nanometers. The high-frequency performance of these epitaxial graphene transistors exceeds that o...

Radio frequency transistors based on ultra-high purity semiconducting carbon nanotubes with superior extrinsic maximum oscillation frequency

Radio frequency transistors based on ultra-high purity semiconducting carbon nanotubes with superior extrinsic maximum oscillation frequency Yu Cao, Yuchi Che, Hui Gui, Xuan Cao, and Chongwu Zhou () 1 Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089, USA 2 Department of Chemical Engineering and Materials Science, University of Southern California, ...