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Large-Area and Broadband Thermoelectric Infrared Detection in a Carbon Nanotube Black-Body Absorber
journal contribution
posted on 2019-11-14, 21:18 authored by Mingyu Zhang, Dayan Ban, Chao Xu, John T. W. YeowRoom-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 via 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 × 107 cm Hz1/2 in 2.5–25
μm spectral range and peak detectivity of 2.3 × 109 cm Hz1/2 at 4.3 THz via 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.
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photodetector exhibitscmcryogenic cooling requirement4.3 THzpeak detectivitynonlithography fabricationlight absorptionPTEhealth condition monitoringenergy harvesterCarbon Nanotube Black-Body Absorber Room-temperaturefar-infrared optoelectronicsbroadband detectivitycarbon nanotube forestIIIfield-effect detectorsself-assembled anti-reflecting CNTFactuating power densityfar-infrared photodetectorsBroadband Thermoelectricenergy harvesters
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