期刊
ACS NANO
卷 13, 期 11, 页码 13285-13292出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b06332
关键词
mid- and far-infrared; carbon nanotube forest; photothermoelectric; black-body absorption; broadband; self-power
类别
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Canada Research Chairs program (CRC)
- CMC Micro-systems Micro-Nano Technology (MNT) Financial Assistance [5487]
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 (similar to 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 x 10(7) cm Hz(1/2) in 2.5-25 mu m spectral range and peak detectivity of 2.3 x 10(9) cm Hz(1/2) 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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