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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…
Carrier scattering, mobilities and electrostatic potential in mono-, bi- and tri-layer graphenes
Wenjuan Zhu, Vasili Perebeinos, Marcus Freitag +1
The carrier density and temperature dependence of the Hall mobility in mono-, bi- and tri-layer graphene has been systematically studied. We found that as the carrier density incre…
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…
The role of contacts in graphene transistors: A scanning photocurrent study
T. Mueller, F. Xia, M. Freitag +2
A near-field scanning optical microscope is used to locally induce photocurrent in a graphene transistor with high spatial resolution. By analyzing the spatially resolved photo-res…