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Issue 2, 2017
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Plasmon-mediated wavelength-selective enhanced photoresponse in polymer photodetectors

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Photodetectors have gained increasing interest in both academic and industrial domains in a ranging number of applications, including image sensing, communications, environmental monitoring and chemical/biological detection. Noble metal nanoparticles exhibit surface plasmons (SPs) associated with the enhancement of a local electromagnetic field surrounding the metal surface, leading to enhanced light absorption. Herein, size-controlled silver nanoparticles (AgNPs), gold nanoparticles (AuNPs) and gold nanorods (AuNRs) have been introduced into polymer photodiodes. The evaluated devices exhibit remarkable photocurrent enhancement at corresponding plasmon resonant wavelengths, directly resulting in a photosensitivity increase. When compared with a pristine photodiode, AgNPs-, AuNPs- and AuNRs-mediated devices reveal maximum enhancements of 46, 49 and 65% for responsivity and 39, 30 and 54% for detectivity for blue (450 nm), green (525 nm) and red (620 nm) light detection, respectively. The linear dynamic range of plasmon-mediated devices and their photoresponse stability have been further explored. The mechanism of plasmon-enhanced photocurrent has been analyzed using steady-state and time-resolved fluorescence measurements. The results indicate that plasmonic structures incorporated into polymer photodetectors can significantly improve the photoresponse in their plasmon resonant regions. This contribution is believed to showcase the effectiveness and attainable wavelength-selectable photodetection by tailoring the size and shape of coupled plasmonic nanostructures.

Graphical abstract: Plasmon-mediated wavelength-selective enhanced photoresponse in polymer photodetectors

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Publication details

The article was received on 27 Oct 2016, accepted on 07 Dec 2016 and first published on 08 Dec 2016

Article type: Paper
DOI: 10.1039/C6TC04662B
J. Mater. Chem. C, 2017,5, 399-407

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    Plasmon-mediated wavelength-selective enhanced photoresponse in polymer photodetectors

    H. Wang, J. W. Lim, F. M. Mota, Y. J. Jang, M. Yoon, H. Kim, W. Hu, Y. Noh and D. H. Kim, J. Mater. Chem. C, 2017, 5, 399
    DOI: 10.1039/C6TC04662B

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