Abstract
Dual-band infrared detection offers enhanced spectral information crucial for improved target identification. Traditional dual-band infrared photodetectors have often relied on expensive epitaxial growth bulk materials, limiting their widespread use in civilian applications. Colloidal quantum dots present an affordable alternative for dual-band infrared detection, owing to their spectral tunability and solution processability. In this study, we have developed an approach utilizing mixed lead sulfide quantum dot films to achieve dual-band infrared detection spanning the NIR (Near Infrared) and SWIR (Short Wave Infrared) ranges. These films exhibit a broad absorption spectrum, ranging from 400 to 1600 nm. When operating within the near-infrared band, the device based on mixed quantum dot films demonstrates an responsivity of 0.18A/W and specific detectivity of 2.38 × 109cm∙Hz1/2/W near 900 nm.While operated in the SWIR band, the detector has responsivity of 0.17A/W and specific detectivity of 2.11 × 109cm∙Hz1/2/W near 1600 nm.
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