Photo-thermoelectric effect at a graphene interface junction.

By Xiaodong Xu, N. Gabor, J. Alden, Arend M. van der Zande, Paul L. McEuen. Nano letters (Print), 2009

597 citations recorded by the source corpus.

We investigate the optoelectronic response of a graphene single-bilayer interface junction using 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 photothermoelectric effect. The PC displays a factor of approximately 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 approximately 100 K, which agrees with recent theoretical predictions.

Subfields: Civil and Structural Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/c2e95f15646bf679b97b3900e935cb0dd998df73

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Citations in the corpus

Graphene Sensors (2011, background): “[64] have studied a bilayer/single-layer graphene interface where the current from photon excited carriers is distinguishable from that generated by thermal effects.”
Strong plasmonic enhancement of photovoltage in graphene. (2011, background): “Although the exact mechanism for light to current conversion is still debate”