Dirac plasmon-assisted asymmetric hot carrier generation for room-temperature infrared detection

Alireza Safaei, Sayan Chandra, Muhammad Waqas Shabbir, Michael N. Leuenberger and Debashis Chanda ()
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Alireza Safaei: University of Central Florida
Sayan Chandra: University of Central Florida
Muhammad Waqas Shabbir: University of Central Florida
Michael N. Leuenberger: University of Central Florida
Debashis Chanda: University of Central Florida

Nature Communications, 2019, vol. 10, issue 1, 1-7

Abstract: Abstract Due to the low photon energy, detection of infrared photons is challenging at room temperature. Thermoelectric effect offers an alternative mechanism bypassing material bandgap restriction. In this article, we demonstrate an asymmetric plasmon-induced hot-carrier Seebeck photodetection scheme at room temperature that exhibits a remarkable responsivity of 2900 VW−1, detectivity of 1.1 × 109 Jones along with a fast response of ~100 ns in the technologically relevant 8–12 µm band. This is achieved by engineering the asymmetric electronic environment of the generated hot carriers on chemical vapor deposition grown large area nanopatterned monolayer graphene, which leads to a temperature gradient of 4.7 K across the device terminals for an incident power of 155 nW, thereby enhancing the photo-thermoelectric voltage by manifold compared to previous reports. The results presented outline a strategy for uncooled, tunable, and multispectral infrared detection.

Date: 2019
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DOI: 10.1038/s41467-019-11458-5

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