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arXiv · 1608.00569

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

U. Sassi·R. Parret·S. Nanot·M. Bruna·S. Borini·S. Milana·D. De Fazio·Z. Zhuang·E. Lidorikis·F. H. L. Koppens·A. C. Ferrari·A. Colli
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Abstract

Graphene is ideally suited for photonic and optoelectronic applications, with a variety of photodetectors (PDs) in the visible, near-infrared (NIR), and THz reported to date, as well as thermal detectors in the mid-infrared (MIR). Here, we present a room temperature-MIR-PD where the pyroelectric response of a LiNbO3 crystal is transduced with high gain (up to 200) into resistivity modulation for graphene, leading to a temperature coefficient of resistance up to 900%/K, two orders of magnitude higher than the state of the art, for a device area of 300x300um2. This is achieved by fabricating a floating metallic structure that concentrates the charge generated by the pyroelectric substrate on the top-gate capacitor of the graphene channel. This allows us to resolve temperature variations down to 15umK at 1 Hz, paving the way for a new generation of detectors for MIR imaging and spectroscopy

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U. Sassi, R. Parret, S. Nanot, M. Bruna, S. Borini, S. Milana, D. De Fazio, Z. Zhuang, E. Lidorikis, F. H. L. Koppens, A. C. Ferrari, A. Colli. 2016-08-01. Graphene-based, mid-infrared, room-temperature pyroelectric bolometers with ultrahigh temperature coefficient of resistance. https://doi.org/10.1038/ncomms14311

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