Graphene-based mid-infrared room-temperature pyroelectric bolometers with ultrahigh temperature coefficient of resistance

U. Sassi, R. Parret, S. Nanot, M. Bruna, S. Borini, D. De Fazio, Z. Zhao, E. Lidorikis, F.H.L. Koppens, A. C. Ferrari and A. Colli ()
Additional contact information
U. Sassi: Cambridge Graphene Centre, University of Cambridge
R. Parret: ICFO Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology
S. Nanot: ICFO Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology
M. Bruna: Nokia Technologies
S. Borini: Nokia Technologies
D. De Fazio: Cambridge Graphene Centre, University of Cambridge
Z. Zhao: Cambridge Graphene Centre, University of Cambridge
E. Lidorikis: University of Ioannina
F.H.L. Koppens: ICFO Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology
A. C. Ferrari: Cambridge Graphene Centre, University of Cambridge
A. Colli: Emberion Ltd

Nature Communications, 2017, vol. 8, issue 1, 1-10

Abstract: Abstract There is a growing number of applications demanding highly sensitive photodetectors in the mid-infrared. Thermal photodetectors, such as bolometers, have emerged as the technology of choice, because they do not need cooling. The performance of a bolometer is linked to its temperature coefficient of resistance (TCR, ∼2–4% K−1 for state-of-the-art materials). Graphene is ideally suited for optoelectronic applications, with a variety of reported photodetectors ranging from visible to THz frequencies. For the mid-infrared, graphene-based detectors with TCRs ∼4–11% K−1 have been demonstrated. Here we present an uncooled, mid-infrared photodetector, where the pyroelectric response of a LiNbO3 crystal is transduced with high gain (up to 200) into resistivity modulation for graphene. This is achieved by fabricating a floating metallic structure that concentrates the pyroelectric charge on the top-gate capacitor of the graphene channel, leading to TCRs up to 900% K−1, and the ability to resolve temperature variations down to 15 μK.

Date: 2017
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DOI: 10.1038/ncomms14311

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