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Spatially resolved photocurrents in graphene nanoribbon devices

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7 Author(s)
Ulrich Stutzel, Eberhard ; Max Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany ; Dufaux, Thomas ; Sagar, Adarsh ; Rauschenbach, Stephan
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We present here a scanning photocurrent microscopy study of individual graphene nanoribbons, revealing pronounced photocurrent responses close to the nanoribbon/metal contacts. The magnitude of the corresponding photocurrent signal was found to be directly proportional to the conductance of the devices, suggesting that a local voltage source is generated at the nanoribbon/metal interface by the photo-thermoelectric Seebeck effect. The dominance of this mechanism is attributed to the reduced thermal conduction capability of the nanoribbons in comparison to extended graphene sheets.

Published in:

Applied Physics Letters  (Volume:102 ,  Issue: 4 )

Date of Publication:

Jan 2013

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