Photo-Thermoelectric Effect at a Graphene Interface Junction

Details Photo-Thermoelectric Effect at a Graphene Interface Junction Photo-Thermoelectric Effect at a Graphene Interface Junction

2009-07-18

arxiv.org/abs/0907.3173v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

We investigate the optoelectronic response of a graphene interface junction, formed with bilayer and single-layer graphene, by photocurrent (PC) microscopy. We measure the polarity and amplitude of the PC while varying the Fermi level by tuning a gate voltage. These measurements show that the generation of PC is by a photo-thermoelectric effect. The PC displays a factor of ~10 increase at the cryogenic temperature as compared to room temperature. Assuming the thermoelectric power has a linear dependence on the temperature, the inferred graphene thermal conductivity from temperature dependent measurements has a T^{1.5} dependence below ~100 K, which agrees with recent theoretical predictions.

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