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Substrate Sensitive Mid-Infrared Photoresponse in Graphene
Marcus Freitag, Tony Low, Luis Martin-Moreno +3
We report mid-infrared photocurrent spectra of graphene nanoribbon arrays on SiO2 dielectrics showing dual signatures of the substrate interaction. First, hybrid polaritonic modes…
Wafer-scale Epitaxial Graphene Growth on the Si-face of Hexagonal SiC (0001) for High Frequency Transistors
Christos Dimitrakopoulos, Yu-Ming Lin, Alfred Grill +12
Up to two layers of epitaxial graphene have been grown on the Si-face of two-inch SiC wafers exhibiting room-temperature Hall mobilities up to 1800 cm^2/Vs, measured from ungated,…
Photocurrent imaging and efficient photon detection in a graphene transistor
Fengnian Xia, Thomas Mueller, Roksana Golizadeh-mojarad +5
We measure the channel potential of a graphene transistor using a scanning photocurrent imaging technique. We show that at a certain gate bias, the impact of the metal on the chann…
Energy dissipation in graphene field-effect transistors
Marcus Freitag, Mathias Steiner, Yves Martin +4
We measure the temperature distribution in a biased single-layer graphene transistor using Raman scattering microscopy of the 2D-phonon band. Peak operating temperatures of 1050 K…
How does the substrate affect the Raman and excited state spectra of a carbon nanotube?
Mathias Steiner, Marcus Freitag, James C. Tsang +4
We study the optical properties of a single, semiconducting single-walled carbon nanotube (CNT) that is partially suspended across a trench and partially supported by a SiO2-substr…