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Issue 26, 2016
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A filterless, visible-blind, narrow-band, and near-infrared photodetector with a gain

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Abstract

In many applications of near-infrared (NIR) light detection, a band-pass filter is needed to exclude the noise caused by visible light. Here, we demonstrate a filterless, visible-blind, narrow-band NIR photodetector with a full-width at half-maximum of <50 nm for the response spectrum. These devices have a thick (>4 μm) nanocomposite absorbing layers made of polymer–fullerene:lead sulfide (PbS) quantum dots (QDs). The PbS QDs yield a photoconductive gain due to their hole-trapping effect, which effectively enhances both the responsivity and the visible rejection ratio of the external quantum efficiency by >10 fold compared to those without PbS QDs. Encouragingly, the inclusion of the PbS QDs does not increase the device noise. We directly measured a noise equivalent power (NEP) of 6.1 pW cm−2 at 890 nm, and a large linear dynamic range (LDR) over 11 orders of magnitude. The highly sensitive visible-blind NIR narrow-band photodetectors may find applications in biomedical engineering.

Graphical abstract: A filterless, visible-blind, narrow-band, and near-infrared photodetector with a gain

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Publication details

The article was received on 08 Apr 2016, accepted on 27 May 2016 and first published on 30 May 2016


Article type: Paper
DOI: 10.1039/C6NR02902G
Citation: Nanoscale, 2016,8, 12990-12997
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    A filterless, visible-blind, narrow-band, and near-infrared photodetector with a gain

    L. Shen, Y. Zhang, Y. Bai, X. Zheng, Q. Wang and J. Huang, Nanoscale, 2016, 8, 12990
    DOI: 10.1039/C6NR02902G

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