Size-controllable fabrication of PbS quantum dots for NIR–SWIR photodetectors with extended wavelengths

Large-sized PbS QDs with detectable wavelengths extended to 2220 nm have been successfully synthesized and applied as the photoactive layer in a NIR-SWIR photodetector with the detectivity of 4.0 × 10 11 Jones at 2100 nm at ambient temperature.