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Issue 13, 2016
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Spectra-selective PbS quantum dot infrared photodetectors

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Abstract

Traditional photoconductive photodetectors (PDs) commonly respond to higher energy photons compared with the bandgaps of PD active materials. Different from the wide detection spectra of traditional PDs, the present reported PbS quantum dot (QD) PDs can detect the spectra-selective light source. Spectra-selective PDs (ss-PDs) of perovskite/QDs and QD/QDs were respectively implemented by integrating two functional layers. The top layer (facing the light) was utilized to filter the non-target spectra and the bottom layer was used for detection. The response spectrum wavelength and the range of ss-PDs can be conveniently tailored by tuning the QD size. The obtained selectivity factor and normalized detectivity ratio from target and non-target illumination can reach at least 10. A narrow detection range with a full width at half maximum (FWHM) ∼100 nm was applied by typical QD/QD based ss-PDs. The prototype ss-PDs were successfully applied in identifying an unknown light source. The convenient tuning and identification capabilities of the present QD based ss-PDs may provide a versatile route to obtain highly spectrum-selective PDs in order to meet the demands for special fields.

Graphical abstract: Spectra-selective PbS quantum dot infrared photodetectors

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Publication details

The article was received on 21 des. 2015, accepted on 26 feb. 2016 and first published on 29 feb. 2016


Article type: Paper
DOI: 10.1039/C5NR09069E
Citation: Nanoscale, 2016,8, 7137-7143
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    Spectra-selective PbS quantum dot infrared photodetectors

    K. Qiao, H. Deng, X. Yang, D. Dong, M. Li, L. Hu, H. Liu, H. Song and J. Tang, Nanoscale, 2016, 8, 7137
    DOI: 10.1039/C5NR09069E

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