Journal
NANO LETTERS
Volume 14, Issue 11, Pages 6374-6381Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl502847v
Keywords
mid-infrared photodetection; graphene-phonon interaction; surface phonon; hot carriers; graphene photodetection
Categories
Funding
- Fundacio Cellex Barcelona
- ERC [294056, 307806]
- Accion Integrada-MINECO grant [AAII- PRI-AIBSE-2011-1298]
- E.C. under Graphene Flagship [CNECT-ICT-604391]
- European project GRASP
- [FIS2013-44098]
- European Research Council (ERC) [307806] Funding Source: European Research Council (ERC)
- ICREA Funding Source: Custom
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The photoresponse of graphene at mid-infrared frequencies is of high technological interest and is governed by fundamentally different underlying physics than the photoresponse at visible frequencies, as the energy of the photons and substrate phonons involved have comparable energies. Here, we perform a spectrally resolved study of the graphene photoresponse for mid-infrared light by measuring spatially resolved photocurrent over a broad frequency range (1000-1600 cm(-1)). We unveil the different mechanisms that give rise to photocurrent generation in graphene on a polar substrate. In particular, we find an enhancement of the photoresponse when the light excites bulk or surface phonons of the SiO2 substrate. This work paves the way for the development of graphene-based mid-infrared thermal sensing technology.
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