What question did this study set out to answer?

To develop a robust multiband infrared photodetector using colloidal quantum dots for improved detection accuracy.

January 22, 2026Open Access

Multiband Infrared Photodetection Based on Colloidal Quantum Dot

Key Points

To develop a robust multiband infrared photodetector using colloidal quantum dots for improved detection accuracy.
Synthesized four bands of colloidal quantum dots: PbS for 1.3 µm and HgTe for 1.8 µm, 2.6 µm, and 3.5 µm.
Constructed planar multiband infrared photodetectors utilizing the synthesized CQDs.
Measured photoresponse and detectivity at room temperature across the infrared spectrum.
Exhibited a photoresponse range from 0.8 µm to 3.5 µm.
Achieved a responsivity of 5.39 A/W at 1.8 µm.
Showed a specific detectivity of 2.01 × 10^11 Jones at 1.8 µm.

Abstract

Multispectral infrared detection plays a crucial role in advanced applications spanning environmental monitoring, military surveillance, and biomedical diagnostics, offering superior target identification accuracy compared to single-band imaging techniques. In this work, we synthesized four distinct bands of colloidal quantum dots (CQDs)—specifically, a cut-off of 1.3 µm with PbS CQDs and 1.8 µm, 2.6 µm, and 3.5 µm with HgTe CQDs—and employed them to construct planar multiband infrared photodetectors. The device exhibited a clear photoresponse at room temperature from 0.8 µm to 3.5 µm, with responsivity of 5.39 A/W and specific detectivity of 2.01 × 1011 Jones at 1.8 µm. This materials–device co-design strategy integrates wavelength-selective CQD synthesis with planar pixel-level patterning, providing a versatile pathway for developing low-cost, solution-processed, multiband infrared photodetectors.

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