Photoconductivity of biased graphene

By M. Freitag, Tony Low, Fengnian Xia, Phaedon Avouris. Nature Photonics, 2012

508 citations recorded by the source corpus.

Graphene is a promising candidate for optoelectronic applications such as photodetectors, terahertz imagers and plasmonic devices. The origin of the photoresponse in graphene junctions has been studied extensively and is attributed to either thermoelectric or photovoltaic effects. In addition, hot carrier transport and carrier multiplication are thought to play an important role. Here, we report the intrinsic photoresponse in biased but otherwise homogeneous graphene. In this classic photoconductivity experiment, the thermoelectric effects are insignificant. Instead, the photovoltaic and a photo-induced bolometric effect dominate the photoresponse. The measured photocurrent displays polarity reversal as it alternates between these two mechanisms in a backgate voltage sweep. Our analysis yields elevated electron and phonon temperatures, with the former an order higher than the latter, shedding light on the understanding of the hot electron-driven photoresponse in graphene and its energy loss pathway via phonons. Scientists report that the photovoltaic effect and a photo-induced bolometric effect, rather than thermoelectric effects, dominate the photoresponse during a classic photoconductivity experiment in biased graphene. The findings shed light on the hot-electron-driven photoresponse in graphene and its energy loss pathway via phonons.

Subfields: Atomic and Molecular Physics, and Optics, Civil and Structural Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/077bb23e1ade7b7b1ead3aa8aeb7672075603241

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In Atomic and Molecular Physics, and Optics

In Civil and Structural Engineering

Phaedon Avouris

In Materials Chemistry

Citations in the corpus

Ultra-compact integrated graphene plasmonic photodetector with bandwidth above 110 GHz (2018, background): “However, as we do not have a gating voltage, and the graphene is under low doping, this results in a negligible PB current [38].”
Graphene Photonics, Plasmonics, and Optoelectronics (2014, background): “In [68], the elevated electron and lattice temperatures were calculated from the”