Large-Area and Broadband Thermoelectric Infrared Detection in a Carbon Nanotube Black-Body Absorber.

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ID: 66551
2019
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Abstract
Room-temperature mid- and far-infrared photodetectors and energy harvesters meet diverse upcoming demands including health condition monitoring, industrial inspection, and miniaturized power-source for Internet of Things. However, the cryogenic cooling requirement for III-V semiconductors and the inefficient light absorption in two-dimensional (2D) materials, for example, graphene (2.3%) and black phosphorus (∼3%), have hindered mid- and far-infrared optoelectronics from widespread applications. Here, we demonstrate a self-powered infrared photodetector as well as energy harvester employing vertical photothermoelectric (PTE) effect of a carbon nanotube forest (CNTF). In the self-assembled anti-reflecting CNTF, 99.4% reflection suppression is observed, resulting in a broadband detectivity of 1.9 × 10 cm Hz in 2.5-25 μm spectral range and peak detectivity of 2.3 × 10 cm Hz at 4.3 THz nonlithography fabrication. By virtue of vertical architecture, this photodetector exhibits enhanced sensitivity to weak and unfocused infrared illumination, which mitigates the high actuating power density in conventional PTE or field-effect detectors and renders practical infrared detection in the real life.
Reference Key
zhang2019largeareaacs Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Zhang, Mingyu;Ban, Dayan;Xu, Chao;Yeow, John T W;
Journal acs nano
Year 2019
DOI
10.1021/acsnano.9b06332
URL
Keywords
black-body absorption broadband carbon nanotube forest mid- and far-infrared photothermoelectric self-power

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