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High performance infrared photodetectors up to 2.8 μm wavelength based on lead selenide colloidal quantum dots

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Fig. 1. Characterization of PbSe CQDs. (a) The TEM image of PbSe CQDs shows the  monodisperse nanoparticles
Fig. 2. (a) Absorbance spectra of PbSe CQD film measured by single wavelength scanning  spectrometer (black color) and FTIR (blue color)
Fig. 3. (a) The schematic diagram of PbSe CQD photodetectors. (b) The current-voltage (I-V)  characteristics of PbSe CQD photodetector device under ambient conditions in the dark and  light illumination (1.52 µm)
Fig. 4. Photocurrent-voltage characteristics of photodetectors under various LED illuminations  with wavelength from 1.5 µm to 2.8 µm for PbSe CQD thickness of (a) 500 nm, (b) 900 nm  and (c) 1400 nm

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